 | | Difference between designer and OEM Polariod kit
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Hi, What's the difference between the Designer and OEM polaroid kits. Which one do I need to hook up the polaroid sensors to the HB? Thanks (26 years ago, 10-Sep-98, to lugnet.robotics.handyboard)
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| | Questions for Fred
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I guess I should have learned by now, to investigate more before jumping out and asking. I examined the two versions of the lib_hb.c the difference in the analog is the absence of the following code in the smooth pwm code: int _raw_analog(int port) (...) (26 years ago, 10-Sep-98, to lugnet.robotics.handyboard)
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| | Questions for Fred
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Fred, or who every can answer this. I have implemented the smooth PWM routines and are very happy with them. I notice now that there is a fix for the analog sensor reading bug. One file that is replaced is the lib_hb.c file, which was also the file (...) (26 years ago, 10-Sep-98, to lugnet.robotics.handyboard)
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| | Re: bootstrap mode in assembling the HB
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yes, RP4 is four isolated resistors, and this being part of the serial line circuit, definitely explains your problem if you are using the common-terminal style. you can just install four 1K resistors if you don't have the correct r-pack handy. fred (...) (26 years ago, 9-Sep-98, to lugnet.robotics.handyboard)
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| | bootstrap mode in assembling the HB
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hi At present I am up to section 4.4, "serial line and stop switch". I have installed all the components as per the section but when testing by applying power and holding down the stop switch, the HB will not go into bootstrap mode. I have not (...) (26 years ago, 9-Sep-98, to lugnet.robotics.handyboard)
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| | Fw: Current Rating use on HB
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(...) that (...) (26 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | encoder use in stepper motor
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hi, How can i use my self build encoder to locate the position when my robot reach a position ? Is it suitable to use a self build encoder together with the stepper motor? The self build encoder consists a photoelectric reflector sensor mounted (...) (26 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | Re: IC dip 120 or Ic dip 210
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(...) (26 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | Current Rating use on HB
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Hi, What is the current rating allow to be use on the HD if currently I am using a stepper motor of rating 4.5V and current 3Amp ? Is it all right directly plug it into the HB? How should I increase the acceptable current rating on the HB? How (...) (26 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | IC dip 120 or Ic dip 210
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Hi, Is there anybody came across such IC Dip 210 or Dip 120 ? rgds, chia (26 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | using interupts from IC
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I want to drive 3 stepper motors form a handy board. I have the code running now as a dll under windows. What Im trying to gain from the HB is using interupts, so I can remain in connntact with the control while the steps time out- right now I just (...) (26 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | Re: Serial Communication with HP48 calculator
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(...) not that i am aware of. you could connect to the HB's phone jack as long as you don't have to talk to interactive c and your calc at the same time. see the FAQ serial answer. (...) the SPI is for high speed SYNCHRONOUS comms (data and clock (...) (26 years ago, 7-Sep-98, to lugnet.robotics.handyboard)
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| | Bootstrap download mode
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Hi I have been trying to get the HB into bootstrap mode without much success. Following the instructions in the manual, I held down the STOP button while turning on the HB. The red and green LEDs were supposed to turn on for a short period of time (...) (26 years ago, 5-Sep-98, to lugnet.robotics.handyboard)
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| | Re: [LCD screen]
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Like this: printf("\n"); printf("\n"); That's all there is to it. (...) (26 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | Re: Bootstrap download mode
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see if you can get it to go into download mode when you don't have the phone cable plugged in. if this works, then you have some kind of probl with your serial connection. make sure you have a normal modem cable, and a telephone style RJ11 cable (...) (26 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | [LCD screen]
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Hello all, I know it's a pretty stupid question, but anyone knows how am i supposed to clear(in Interactive C) the LCD screen of the HandyBoard ? I've tried printf("\n"); printf(" "); but it doesn't work. Thank you very much. Marcelo Manjon (26 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Phillip: In the process I was referring to, you do not use the Handy board, driver or anything to determine the step sequence. You only use the motor and a battery (after you finish with the Ohm meter). The idea is to learn what the motor is (...) (26 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | expansion board
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Hi, I was wondering how the expansion board is doing? Is out of testing? Any major glitches? Ilya (26 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | HB web servers down
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hi all, we had a filesystem upgrade last night and both of the Handy Board web servers (el.www.etc and lcs.www.etc) are presently down. Hope to have at least one of them running later today. Fred (26 years ago, 2-Sep-98, to lugnet.robotics.handyboard)
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| | HandyBoard for Sale
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If you are thinking about buying one... I have an extra HandyBoard controller board that I assembled and tested. Never used in a project. 68HC811E1 (2K EEPROM) 32K RAM 2 x 16 LCD 9 Digital Inputs 7 Analog Outputs IR Interface Nicad Batteries RS-232 (...) (26 years ago, 30-Aug-98, to lugnet.robotics.handyboard)
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| | Re: [Interactive C features]
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[Randy Sargent] spake unto the ether: (...) Sigh. I can't forsee our Autonomous Robotics course buying 15 copies of IC 3.x or greater until it supports case/switch. It's the only feature that our students using freeware 2.81 really complain that (...) (26 years ago, 28-Aug-98, to lugnet.robotics.handyboard)
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| | Resend: problems with main()
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I posted earlier in the week about having a problem with the SRAM. I have determined that there is not a problem with the SRAM on the handyboard. The problem is that "main()" is not executing on reset like it is supposed to. The program that I am (...) (26 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Analogue sonar design.
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Hi, There is another way to get the Polaroid sonar unit. And that is to find an old Polaroid camera. That's the hardest part but allot of people bought them and are not using them any more. When you open it up there will be the Sonar board complete (...) (26 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Phillip and others, To this excellent exposition I would change only one thing: (...) Change this to : "Write this pattern down neatly IN YOUR ROBOTICS NOTEBOOK." One of my professors at school noted that the most important thing he learned in (...) (26 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Phillip First step is to put a piece of tape on the shaft so that you can clearly see the shaft turn. Next determine what kind of motor you have (you have probably already done this). Get an ohm meter and determine which wires are connected to (...) (26 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Hi Philip, are you shure, you have the right pins from the stepper to the outgoing pins from your chip. Have your stepper 4,5 or 6 cables? If you exchange the cables, your stepper motor only do some vibrations or doing nothing. The easiest way to (...) (26 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: [Interactive C features]
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You can also upgrade to IC 3.1/3.2. Among the improvements include support for multidimensional arrays. -- Randy ---...--- (...) (26 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: [Interactive C features]
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(...) You could use a one dimensional array of length width*height such that: cellMazeWhatever[x][y] is turned into cellMazeWhatever[(x-1)*width+y] (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | [Interactive C features]
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Hello All, my name is Marcelo Manjon and i am 5th year graduate student of Mechatronics Engineering at Politechnic School of Sao Paulo University. Turns out that this year i'll be developing a Micromouse Robot using the MIT Handy Board. I have (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Analogue sonar design.
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Jeroen van der Vegt, Let me suggest some articles. First "Sonars on the Cheap" by Keith Payea page 20 of the Fall 1995 issue of The Robotics Practitioner. This looks lie about a $30 design. Second "An Experimenter's Cheap Robotic Sonar System" by (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | HB's analog inputs
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does anyone know if the handy board's analog inputs can accept analog current output(4-20mA) from a photo-electric distance sensor? (e.g. the sensor might return 4mA if the object is 1 ft away and 15mA if it's 3 ft away) or can it only accept (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | problems with main()
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I posted earlier in the week about having a problem with the SRAM. I have determined that there is not a problem with the SRAM on the handyboard. The problem is that "main()" is not executing on reset like it is supposed to. The program that I am (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: HB's analog inputs
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(...) Edmund, Typically the solution is to pass the 4-20 mA through a 250 ohm resistor and measure the voltage across that resistor. As long as your A/D input impedance is high, it can be ignored. A resistor is essentially a current to voltage (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Steppr motor pulse problem
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Hi, I've encounter some problem on using the stepper motor with my self-built driver. I am not using the driver in the HB. I have to build out a driver. The driver chip I use is L298 and logic gate chip is L297 or 374( this chip also use in HB) . (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Digital Outputs
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I have discovered that I can use PA6 as a digital output and am wondering if the same applies to PA3 if I do not require a piezo buzzer? Thank You Joe Martin joema@mpx.com.au (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Mekatronics also sell the GPU58 series detectors -----Original Message----- From: Rick Moll <rickmoll@mvp.net> To: Victor Ruiz <ruizvic@mx1.ibm.com> Cc: handyboard@media.mit.edu <handyboard@media.mit.edu>; Rick Moll <rickmoll@mvp.net> Date: Tuesday, (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: interfacing V2X compass
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(...) I ended up doing the same thing. I appreciate hearing that someone else had thesame problem, and used the same solution. It sure is frustrating that you can't trust the documentation that came with the compass; if you need to reset the thing (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: interfacing V2X compass
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Rick, I had the same problem. Also the compass would occassionally lock up and require a reset. I tied the reset pin to a digital out and added a routine to take all the necessary pins high and then cycle the reset pin. I reset on initialization and (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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(...) The most common metal can IR detectors are made by Sharp. The older ones I have are marked GP1U5X2 (with pins coming out the back of the can), but the newer ones I have are part number GP1U58Y (and have pins coming out of the bottom of the (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | HB 4 sale
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I have an assembled Handyboard and MIT's 6.270 board for sale. Both boards work great. 125 ea or 200 for both. Reply to this email (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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