 | | Parts availability
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To all: I am constructing the Handy Board from 'scratch', since many places want upwards of $200 for a built (and tested) board. I have located most of the required parts, but have not located the following: the 1 uH iron core inductor the 5W 47ohm (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | How to measure the signal Voltage ?
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Hi Everybody, I am using the retroreflective sensor to an object . The sensor is came from Masushita NAIS brand name. It has 3 wires . ONe for the +ve supply , one for the -ve supply, one for the output signal line. The sensor is using a NPN type. (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Print to LCD
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Hi everyone, Does anyone know how to print messages to the LCD in assembly language. Thanks (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | RE: External Motor Power and the Expansion board.
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I noticed this to when I built mine, I just bridged the gap I had cut with solder and now use an H-bridge to control the motors. Clancy (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Problem resolved?
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To all, Regarding my previous... I am not sure if it was a soldering connection, but after retesting the output voltages it is very close.. Fred says that the voltages should be between, say, +9 and +10, but I'll get a 8.7.. Is this good enough? If (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | MAX232 Chip
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To all: I am constructing my first Handy board. I am currently building the interface board, but have hit a small 'snag'. While performing 'step 2', installing capacitors and MAX232, and then testing, I did not recieve the correct voltage outputs. (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Re: External Motor Power and the Expansion board.
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ahah, good question. the exp bd grabs the 9v motor power for the servos, sonar, and 9v lego sensors. if you're not using any of these, you could leave connector off the exp bd and you'll have no probs. if these are important, you need to reconnect (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | External Motor Power and the Expansion board.
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Greetings all! I just got the kit for the expansion board in the mail, and I realized something: I modified my handy board to accept external power for the motors through the power expansion header, using the instructions at: (URL) and now I don't (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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The modulation frequency of the IR diodes must match the sensor (depending on exact part number, around 38 KHz) within +/- 3 KHz. As you move away from the center frequency, detection drops off sharply. Are you able to confirm the modulation (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | ICC11v5 - interrupts
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I have a HB (running under IC3.2) that is linked to a 'slave' TCOMP board (68HC11E1, 32k ram) which is programmed using ICC11v5. I need a function similar to 'msleep' on the TCOMP unit. I am trying to use portions of Chuck McManis' HB library for (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Sharp GP2D02 and assembly language
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Hi, I have the same problem. For now I don't care since the GP2D02 is the only thing connected to an digital output. I am using the following: Include: subroutine_get_userval: ldab USERVAL ; load USERVAL to d register clra ; clear upper byte rts ; (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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(...) You can download the archives from the HB web site: (URL) Will , , __@_/ \_@__ |/ | /__, o @_/ )\ ) ( \ (\/\\, ~~~...~~~ ' ` ~~~...~~~ ` ~~~...~~~ Wendy Parson, A liberal is a man too broadminded Will Bain, to take his own side in a quarrel. & (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Tracking device
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Chen, I am no expert on computer vision, but Greg Hager of Yale University's CS dept. gave a talk at our school last week about developing function libraries for visual tracking. His web page is (URL) It seems relevant to what you are trying to do. (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Tracking device
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(...) If you are trying to track something moving, it is pretty simple, if you have a fixed camera. Take two images, separated by a reasonable amount of time (2 subsequent frames may not be enough). XOR the two frames, everything the same will show (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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I am new to the list and want to know if there is anykind of archives of old e-mails to the list as I would like to see them. Thanx ___...___ Steve Wall Sir Sandford Fleming college Swall@flemingc.on.ca (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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(...) I don't think "Less sensitive" and "Sharp IR detector module" go together. When they designed that module, their goal was to make a device as sensitive under all types of conditions. It compensates for changes in ambient light and in flashing (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Tracking device
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hello everyone. my team has been assigned to make a tracking device for our robot making use of a video camera or the camera on this silicon graaphics computer in the lab but i'm not exactly sure how to begin. any suggestions or words of wisdom (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Book Review ??? -Reply
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I bought the "Personal Robot Navigator" last year. The book focuses on the simulation software (came with the book). There is almost no hardware discussions at all and I found that frustrating (especially after reading "Mobile Robots"!) The model (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Stupid Sonars
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Try connecting a 4.7K pull up resistor to VCC on the ECHO pin before the diode. the echo pin is open collector and pull up is provided by the handy board digital input when used as described in the handy board instruction. When you add the diode (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Sharp GP2D02 and assembly language
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Hi, I've written a short assembly language routine to access the Sharp GP2D02 sensor and it works just great but... I have one question. Since I use the expansion board's digital outs to control the sensor I need to make sure my routine doesn't (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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Eric - - You might try shielding the IR sensor ... add successive layers of "Scotch" tape until you get the desired sensitivity. I'm using layers of black plastic trash bags ... it blocks a lot of visible light, but very little IR. - - - Nick - - - (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: L.E.D. question.
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Typical drop across an LED is about 1.45v. A unit rated at 5v likely has a build in voltage drop/current limiter (read resistor). I would suggest reading the info sheet for absolute ratings. In general, 'any' generic LED will work. Buy the cheapest (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: HB to create video displays?
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At 03:25 PM 2/22/99 -0500, Steve Wall wrote: [snip] In short I want to be able to watch the monitor and have (...) Checkout Decade Engineering's Bob II board at: (URL) I don't think it can do graphics, but it accepts serial input at 9600 baud and (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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(...) Been there, done that! Funny. I bought almost all the same stuff from my local shack. Writting the software was the easy part ;^). (...) I've supplied some power to the inverter, yes. I'm assuming it's mandatory to have the inverter actually (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: lib_r2.lis ?
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Dear Mr Pennington, Have you configured IC using ic -config command ? This sets the library file and its directory. For handy board, the library file is lib_hb.lis.This is a list file which contains the words lib_hb.c and lib_hb.icb. The lib_r22.lis (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Visual Basic and parallel port
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i know that this doesn't really have anything to do with the handyboard but has anyone tried to access the computer's parallel port with visual basic? =) chen (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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Bob - - Here is a link to the 74HCT04 data sheet: (URL) that this helps. - - - Nick - - - Bob Kelly wrote: <snip> (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | electronics question please help
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Hello all, I hope there is a simple answer for this... I have attempted to build the circuit that will allow IR object detection using the Sharp IR detector module and a pair of "high output" infrared LEDs. The circuit I built was the one from (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Book Review ???
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Does anyone have any comments about "The Personal Robot Navigator". It is sold by (URL) about $50. I have read (and continue to read) "Mobile Robots: Inspiration to Implementation" and think it is a *must read*. TIA - - - Nick - - - (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR question
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(...) I just looked over the code again, and you're right, I see no reason why it shouldn't work. I guess the comment is just left over from a previous version where it did make a difference. This is not something I can test though, so I'll have to (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | HB to create video displays?
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I am thinking of putting a wireless board-level color or B&W camera on my Mobot and I have a question for all the techies. Is it possible to use one of the different outputs on the HB to interface with the camera to put diagrams on the live picture? (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Need Handy Board memory debugging software
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Gentlemen: I'm having a bit of trouble with my handy board's display. The board itself works, and I've swapped out old display for a new one. I suspect the memory or transparent octal addressing latch to be at fault. I understand you've memory (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Shaft encoder sensors...
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Zagros Robotics sells them for $7.00 ea US (URL) Message----- From: John Vaughn <vaughn@HWS.EDU> To: Kat <khorvath@up.edu> Cc: handyboard@media.mit.edu <handyboard@media.mit.edu> Date: Monday, February 22, 1999 10:23 AM Subject: Re: Shaft encoder (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR question
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I found that article listed at: (URL) It was in the January 1999 issue, titled: "Multiprocessor Communications Part 1: Methods for Communicating " Maybe it wasn't 68HC11 specific after all. Gerald (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR question
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James, I'm not sure if this is the correct answer since I am new to the Handyboard, but I think it is: If you do not disable the IR Input Interrupt, your transmission could be 'interrupted' by the receiving information and this may mess up your (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | IR question
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Hi Max Davies and everyone, In your documentation (irinfo.txt), you said that we need to disable the IR input interrupt routine before transmitting another signal, what is the reason behind that ? As the IR input and output are both interrupt driven (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | L.E.D. question.
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What are the L.E.D. voltage ratings for the L.E.D's on the interface board I purchased one(at Radio shack) with a rating of five volts. Which should be O.K right? any help would be appreciated. I have to improvise to get such components cheap. Thanx (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Shaft encoder sensors...
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Kathy, Digi-Key has three kinds. The first two look like the "Mobile Robots" type: QRB1114QT-ND $1.58 QRB1134QT-ND $2.83 The third one looks like a much more compact arrangement: QRD1114QT-ND $1.50 These are on Page 552 of the January-March catalog. (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Shaft encoder sensors...
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(...) The Hamamatsu P3062-01 IR photoreflector mentioned in MR was discontinued and replaced by the P5587. This chip has the identical pinout and dimensions as the original. I ordered several from Hamamatsu last year but they are pricey (~$7/ea) in (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | photoreflective sensors
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Kathy($B!)(B) wants photoreflective sensors for shaft encoder. How about the products of Toshiba? See (URL) ***...*** takatsu@isenshu-u.ac.jp School of Science and Technology, Ishinomaki Senshu University 986-8580 Ishinomaki, Miyagi, JAPAN (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Shaft encoder sensors...
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Can anyone help? My team is trying to get a shaft encoder to work, but cannot find a chip that will work correctly to count the black and white stripes on the wheel. We would like to use a chip which can be connected directly to the digital inputs (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Stupid Sonars
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I have a extremely complicated two polaroid sensor set up going on... I had a diode connected to each of the ECHO lines so that I can combine the two lines together... However, no signal passes through this setup... However, I have validified the (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Timer display
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Hi, I would like to display a clock on the LCD display using the real-time interrupt of the 6811. But it does not seen to work at all. Does anyone have done a similar clock on the handyboard ??? Regards, James (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR output
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In response to: (...) Could a hardware expert (Fred?) please give a more definitive answer to this? What value resistor should be used? After extensive IR use with just an IR led and no resistor my transmission circuit eventually died... I guess I (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | lib_rs.lis, nevermind.
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Sorry, I wasn't thinking, doh! (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Sharp Ir and Eltec 442 Pyro detector
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Hi guys, I was wondering if anyone of you could help me. I'm trying to connect a hacked version of a Sharp GP1U58Y Ir detector(hacked so it is now analog instead of digital) to the HB so as I could use it for Ir Proximity sensing or distance (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | lib_r2.lis ?
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IC can't seem to find: /usr/local/lib/ic/lib_r22.lis Is this important? Where is it (not anywhere on my box.) Thanks all. (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Expansion Board Problem
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Yes there are two four pin connector along the fornt edge of the expansion board that connect to J13 and J8 on HB, one 8 pin (2 rows of four) that connects to jumper J6 on the HB and one 10 pin that plugs into the expansion bus J3 on the HB. Hope (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Downloader, nevermind
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I have the ic-src-unix file, and see it in the tree, sorry. (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Diodes for sonar don't cut it
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I promised to update all you ultrasonic types on my progress (or lack thereof) in connecting two sonar modules to the HB. Well, I still haven't figured out if there's a way to connect two sonar module echo lines to the same TIC port on the HB. The (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Downloader for Unix
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Where might I find the downloader program dl for Linux? I know it exsists, but cannot find it on the MIT/Handyboard site. Thanks. (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re:
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Will - - I'm also working on implementing multiple sonar sensors on the HandyBoard. My intention is to mount 4 transducers using Adam Cox's multiplexor. At present I'm struggling with the software attempting to reduce false readings and increase (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re:
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(...) I'm still working out the best way to connect two sonar modules to the HB (using two complete module board/transducer sets). Both modules ping, but I'm getting signal contention with both echo lines connected to the same TIC port. Probably the (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Sonar Sensors
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(...) I don't know much about electronics, but here are a few hardware questions that others have asked me: Can you verify that each sonar works ok all by itself? Are you using two separate sonar module boards, one for each transducer, or are you (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Expansion Board Problem
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We assembled the HandyBoard ourselves and everything seemed to go great. However, the new set of analog inputs does not seem to be reading in values correctly. The input always seems to be stuck at 250 (The handyboards inputs still work fine.) I've (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Sincere apologies
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Hello every one, I sent the unsubscribe request by mistake to the list instead of Fred. take care Amit =) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: msleep function in ICC11?
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Dear Ranjit, I do not know much about ICC11, but if you can get the system time using some function, you can write an empty loop using while{} or do{}while until the time delay is over. Yours sincerely, Nitin (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Type conversion.
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Dear Federico, Typecast the integer into float. ie write the statement as dtemp=(float)temp*3.5 Refer to any C book for information on typecasting. Yours sincerely, Nitin (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: please remove me from mailing list
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For getting out of the mailing list, send an e-mail to Fred Martin at fredm@media.mit.edu and not to the mailing list. Read rules sent to you when you first joined the list. (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re:
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See www-personal.engin.u.../~johannb/ for a detailed paper on EERUF (Error Eliminating Rapid Ultrasonic Firing). Using the algorithm described there, he used 12 sonar sensor at the same time - allthough I don't know if the HB is powerfull enough for (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: asm -> icb
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hi, based on the code that some of sent me i wrote a (bash) script for linux, but i still get differences in the "cre" part of the file, and more specifically in all lines after the "*" (all numbers are off by two). any ideas what is going on? (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR output
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You can connect an IR LED to it. Maybe you may need a series resistor to limit the current through it as well. Basically, the IR LED acts as a transmitter (the same round thing in front of your remote). The demodualator is not a transmitter...it is (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: unsubscribe
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dear amit (& others), sending messages to "handyboard" will NOT get you removed from the list. The only way to get removed from the list is to read the instructions and follow them. These instructions may be found at (URL) luck. this may be a (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | IR output
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What type of IR component do I need to attach to the Handyboard to allow the IR output to function? Searching the FAQ and documentation only showed the connection circuit up to the point of the header strip. I assume it wouldn't be the same as the (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | unsubscribe
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I would like to get off the handy board list for a few days. I am having some email Overflow problems thanks you =) take care Amit Bhavsar (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Sonar Sensors
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Ok... both of my sonars are now fully functional and clicking like they should... I took the test prgram from the website and changed some of the values to make it use D3 for the other sensor... Here is my problem though... When I output the values (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Re: asm -> icb
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(...) The assembler is available at (URL) word of caution: it doesn't seem to work for really-really small programs like you might try for your first test. It seems like you have to have a hundred bytes or so of code before it gives correct results. (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Re: RF VIDEO?
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(...) You can get an Audio/Video transmitter that uses UHF from Marlin P. Jones (www.mpja.com) for $18.95. It has standard RCA female inputs for 1V P/P Video @ 75 ohms and .1-1V RMS audio @ 600 ohms (they sell an audio board for $3.95). Both run on (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Re: asm -> icb
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(...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | (no subject)
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Has anyone connected more than one sonar sensor to the handyboard? I'm looking to use the handyboard to connect six sonar sensors to my pc via the parallel port. I'm using C to talk to and readback from the parallel port. The sensors can be fired (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | asm -> icb
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hi, looks like i cannot find the shell script (as11_icb) that assembles an asm file and packs it into an icb file. in theory it should be with the pcode source distribution but it doesn't seem to be there. i'm sure i am missing something. could (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar problems
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Guy wrote: <snip> (...) The numbers you're getting may correspond to the length of the blanking interval, which would suggest that the transducer is still ringing when blanking ends. You might try increasing the blanking interval so that you're sure (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Linx technologies RF modem
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doug@knowpeace.com wrote: <snip> (...) I did some reading about the new PSC1000 CPU, and it seems like the ideal next step in the evolution of hobby/research robot controllers. I especially like the support for Java and networks. Not being a (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | how to use a 4*20 Display with the HB
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HI, I'd like to use a 4*20 display, and i think i have to rewrite the pcode.... Have someone done it already for a 4*20 display ? if, someone have ,can you send the pcode to me ? or can someone give me instructions how to change the code ? thank You (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Polaroid Sonar problems
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Hi! I know this has been dealt with before, yet I couldn't find a good answer in the mailing list archive. Maybe someone could give me a hand, I've been having problems with the sonar connected to my HB. I followed the directions on the web page, (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | RE: Linx technologies RF modem
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Dave, I'm looking seriously at the Linx HP eval kit. Please let me know how yours works out, and any tips on installation to the handy board would be greatly appreciated. Also, what if I wanted to put HP RX/TX on two robots plus host computer, I (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Unsubscribe!
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Please unsubscribe me from this mailing list. Thank You! (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | Re: msleep function in ICC11?
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You can't use the one in the library I wrote? (its available on the iccll web site) Basically msleep spin locks on the timer waiting for systicks to increment the appropriate number of milliseconds. If you aren't using my code you can do the same (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | msleep function in ICC11?
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I have a HB w/exp brd and a PortMaster (a stock board with a 68HC11E1, 68HC24 port expansion and 32k ram). I'm programming the HB with IC3.2 and the PortMaster with ICC11v5. I am hung up trying write a funtion similar to the HandyBoard 'msleep' (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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| | RE: Linx technologies RF modem
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I managed to speak with one of Linx's applications engineers- He said that a couple of the guys over there are using the Linx modules to communicate with HC11's, so interfacing the kit with the handyboard shouldn't be much of a problem. He said I (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Type conversion.
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(...) Hi, what you want to do is called type casting,ie. you must explicitly specify the type. I've included some sample code that uses it. Because the beeper function expects a float but the knob function returns an integer, you have to modify the (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Type conversion.
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FEDERICO SANTELLO wrote: <snip> (...) Federico - - Try doing it this way: (it's called a "cast") int temp; float dtemp; temp = 5; dtemp = (float)temp*3.5; printf("dtemp=%f\n",dtemp); Enjoy, - - - Nick - - - (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: color sensors
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I believe that you will find that most photo transistors are sensitive to a very narrow range of frequencies, mostly in the IR range. OTOH a photo resistor is sensitive to a much wider range of frequencies and may be usable with a (colour) filter. (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Type conversion.
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Hi to all. I'm not very practice with IC. My answere are , how can i convert a integer number to a floating point number? I want to make a moltiplication between an intger number and a floating. I make this: int temp; float dtemp; dtemp=temp*3.5; (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Polaroid Sensors
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I just finished wiring up the HB for dual sonar sensors... A couple of problems... The first and most important is the fact that the values returned look to be completely random and often flipping between positive and negative values... Could this (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR Sensors
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James - - Here's a link to the QRB1114 data sheet: (URL) limited playing has shown two things: one - the sensor is very sensitive to visible light and therefore needs to be used with an auto-calibrate routine. two - you have to be very selective in (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR Sensors
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James - - Here's a link to the QRB1114 data sheet: (URL) limited playing has shown two things: one - the sensor is very sensitive to visible light and therefore needs to be used with an auto-calibrate routine. two - you have to be very selective in (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | SPI .vs. I2C and Documentation
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Hi all, I've been looking for some way to connect multiple devices (Handyboards, other 68HC11's, PIC's, custom devices, & PC's). From what I can find, I2C is the Phillips protocol which is well documented and supported. (Docs, Specilaized chips, (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | rc cars and HB- simple questions
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Hello. I've seen several discussions abot RC cars here, and I have two questions trying to verify my findings. Has anyone ever dealt with Radio Shack rc cars? I bought the one that can move back and forth on tracks and also sideways on wheels. So (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR Sensors
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James What you see as black and what is black to IR may be different. I did some experiments for a line following race, and found that some black markers actually made the paper reflect IR better than plain white paper. The conclusion of my (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: color sensors
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I wonder whether there are some phototransistors out there that have peak sensitivity to a small range of the visible spectrum. Preferably to "one color". Can anyone fill in here? ---...--- ericson mar Robotics Consultant mar@cooper.edu (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: MC68HC11A1FN
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Your message said: (...) Jon, I had the same question a while back and was overwhelmed with the number of handy board enthusiasts who clued me into BG Micro. I checked their website, searched for MC68HC11A1FN and sure enough! --there it is for less (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: MC68HC11A1FN
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Are you sure about that! I just checked B.G. Micro today and they have it in stock Part# ICS68HC11A1 $6.95 ea. Try again go to shop online and enter 68HC11A1FN in the search field. -----Original Message----- From: Jon Ryan Schuck (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: MC68HC11A1FN
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BG Micro DOES sell it, I just checked with them last week, and plan on purchasing a couple myself this coming week. They sell it for less than 7 dollars a piece! Good luck. -- /---...---\ Eric Smiley Duke University Delta Kappa Epsilon House 1C1 rm. (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: color sensors
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(...) What about putting different color filters in front of a photo transister, like you would on a camera. You could then enhance certain colors by filtering out the others. You may have to deal with some reduction in sensitivity but it may be (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | IR Sensors
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Hi everyone, I've hooked up the QRB1114 infrared sensors to the analog input ports. Although they appear to be operating, their values make little sense. Whether a black or white object is placed in front of the sensor, the Handyboard reads in a low (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Servos and solenoids
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I won't attempt to power your servos with 9v. Those servos are designed to work off a 4.8v battery pack, you'll most likely smoke'm. Wayne -----Original Message----- From: J.W. Pennington <jwp@awod.com> To: handyboard@media.mit.edu (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Servos and solenoids
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First, The Handyboard's motor output is 9 volts, does anyone know if Futaba's small servos handle this well? I have two S3003 servos that I'd like to use. Second, Has anyone run a solenoid from a motor output? I'm assuming that it would do fine, PWM (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | MC68HC11A1FN
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Does anyone know a good place to purchase the MC68HC11A1FN chip? I haven't found a single place. Motorola doesn't seem to sell them... neither does BG MICRO. Jon (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR Sensors
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(...) Many optically black materials do not at all affect the IR range of the spectrum. It is possible that your black object is not black (read "absorbant") to IR and simply reflects it just like the white. Try several different materials. Many may (...) (26 years ago, 19-Feb-99, to lugnet.robotics.handyboard)
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