 | | LCD configs (was:Suppliers and rf link)
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(...) I just wanted to voice a warning of sorts. I ordered the 2 X 16 LCD from them and the pinout is slightly different. Instead of a single line of 14 pins: x x x x x x x x x x x x x x They come with a dual inline 2x7 pin configuration: x x x x x (...) (26 years ago, 12-Dec-98, to lugnet.robotics.handyboard)
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| | Thanks
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I'd like to thank everybody who sent me all this valuable information about suppliers and rf link. I think now I can make my handyboard with less then US$ 60.00 without the batteries and motor drivers (I want to use it in data acquisition). As I (...) (26 years ago, 12-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Suppliers and rf link
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Cesar, Nuts & Volts magazine caries lots of adds for just the sort of thing you need (www.nutsvolts.com). I wanted to mention here the 2 X 16 and 2 X 20 LCD displays which are on sale for $8.00 each at www.flat-panel.com. Hope this helps Pherd (26 years ago, 12-Dec-98, to lugnet.robotics.handyboard)
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| | config download problems
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Hi I am building a handyboard from scratch after finding it on the net. I actually purchased two pcb's from Douglas Electronics. An aside, they were great to deal with answering all my questions promptly and efficiently. I built the first hb and had (...) (26 years ago, 12-Dec-98, to lugnet.robotics.handyboard)
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| | Source of 68HC11 in UK?
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Does anyone know of a supplier for the 68HC11 in the UK? Also any handyboard suppliers in UK. Peter (26 years ago, 12-Dec-98, to lugnet.robotics.handyboard)
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| | Is my serial interface shot?
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I get the message "Board disconnected or not responding" when I try to run ic. (The board was working fine before).So I tried to re load the pcode, but I have run into a slight problem: With the serial interface disconnected, I hold down the stop (...) (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | Re: How to get digital outputs from the handyboard???...???
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(...) First, to enable the four SPI pins D2 through D5 as digital outputs, make sure you do a bit_set( 0x1009, 0x3C ). (In the sonar.c program, for example, bit_set( 0x1009, 0x30 ) seems to only enable two of the pins--not all four). I think poke (...) (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Suppliers and rf link
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Yeah, BGMicro is good, they seem to have a neverending supply of used 68HC11A1FN chips for $6.95. If you want new, try: Future/Active voice 1-800-655-0006 fax 1-800-645-2953 (no internet address) 41 Main St. Bolton, MA 01740 USA They list the chips (...) (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Suppliers and rf link
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www.bgmicro.com Nice people, good service (they sent me spec sheets once without me ordering!) HC11's for about $6.95 or so, and they have almost every part you'll need for a HB, miniboard or Rug Warrior board. (MAX233 chips, 32k RAM, crystals, (...) (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Suppliers and rf link
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(...) As someone mentioned earlier (and I can attest to the accuracy) www.bgmicro.com sells the 68HC11 for something like $6 to $8. I bought two and they arrived in only a few days. john calhoun- (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Suppliers and rf link
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I bought most of the parts from the following: www.mouser.com www.digikey.com www.jameco.com The 68HC11 will be the most dificult to find. (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | Stepper vs DC
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after reading your mails, it seems to me that the dc motor is better than the stepper motor. doesn't the stepper motor offer any advantages over the dc motor? is the stepper motor that bad? edmund. (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Servos for the miniboard
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Jonathan, I would probably go with a futaba servo. I dunno how much torque you need, but for a small(up to .30 cubic inch displacement, maybe even .60) engine, the s148 does the job quite nicely. Tower hobbies sells them for $14, and they can be (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Suppliers and rf link
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Hi friends! I need some help from you, it's being very difficult to obtain the parts to make my Handy Board here in Brazil. I'm buying one from Hong Kong, but I'd like to buy some extra 68hc11s and lcds, between other things. I have relatives in the (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Re. RF data link
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In response to rf link, How about standard wireless modems? I know of a few which are made specifically for this purpose and baud rates are between 300-9600 baud ,you set the rate according to your robots capabilities. If you are interested conact (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Fwd: Re. RF data link
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-- MIME ATTACHMENTS DISCARDED: 1. Content-ID: <0_913320756@inet_ou...aol.com.2> Content-type: message/rfc822 Content-transfer-encoding: 7bit Content-disposition: inline Content-Length: 1259 (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | How to get digital outputs from the handyboard???...???
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hi everyone, i have been trying for the past few days to get digital outputs from the board but with no success. i have been trying to get digitals outputs from the SPI's pins (J6). i have poke to make the port as output port. but the problem now is (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Servos for the miniboard
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I would like to use a servo to operate the throttle of a small gas engine. I am planning on using the miniboard to control the servo. Are there any brands to avoid? Are there any brands that are far better than the rest? Will just about any RC servo (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | How to get digital outputs from the handyboard???...???
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hi everyone, i have been trying for the past few days to get digital outputs from the board but with no success. i have been trying to get digitals outputs from the SPI's pins (J6). i have poke to make the port as output port. but the problem now is (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | How to get digital outputs from the handyboard???...???
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|
hi everyone, i have been trying for the past few days to get digital outputs from the board but with no success. i have been trying to get digitals outputs from the SPI's pins (J6). i have poke to make the port as output port. but the problem now is (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Stepper vs DC
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It depends. if you are looking for higher top speed and more torque using less power, DC may be the way to go. If you want accuracy but don't want to deal with shaft encoders and the code overhead needed to precisely control and monitor your DC (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | stepper motors from 5 1/4 drives
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Okay, another newbie question: What do I need to take out of the 5 1/4 drive, other than the motor to get this to work? Also, what about drivers for the same? Anyplace I can get more info on this? I have a bunch of old drives laying around. thanks (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Stepper vs DC
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(...) Actually, steppers do have some advantages. 1) If you do not have encoders on DC gearhead motors (or wheels, etc) they are notoriously hard to position accurately. Steppers can be controlled very accurately. Most servo motors cannot rotate (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Do It Yourself RF module????
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Bastiaan: I wanted to suggest that you investigate the Ham Radio community. Some search words to help get you started include PACKET and ARRL. The first is one of the digital communications protocalls used in Ham Radio, and the second is an (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re. RF data link
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If the data tx/rx modules can't handle TTL levels is there any reason to have the interface board at the PC end ?, why not replace the serial cable going to the PC with the rx/tx modules ?. Surely this should work. John (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: DC Motor movement
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(...) Each motor may have slightly different characteristics even though they may be the same brand and model. This is what you are probably seeing. The ultimate solution is to use a feedback mechanism, like a shaft encoder, on the motors and use (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Newbie Questions, Problems & Contributions...
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(...) I've heard the difference is that the buttons, the knob and the sensor ports won't work as expected. Try moving pcode_hb.s19 to the directory that contains the dl executable, or to the present working directory, or to the directory specified (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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have you tried re-loading pcode_hb.s19 using a downloader program. fred In your message you said: (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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Hello this is mike, I am writing regarding the handy board. What happened was while working on the handy board, our motor control (the H-bridge) heat sink touch the metal chassis of our robot. This lead to one of the components on our H-bridge to (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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hello, i use the handyboard for closed loop position control. the handyboard is good for such a task provided that you choose a motor well suited for the task, and an accurate feedback element, such as a (very) linear pot or optical encoder. as for (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | RE: persistent var's in IC
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I had a similar problem using the freeware IC and I found that things like the position in the code at which the persistent array was initialised made a difference. Eg put the initialisation of the array right at the beginning of your code, this (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Question for Fred
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Hi Fred I have question for you. I have to control a position using the miniborad or the handyboard. And I don't know which motors is good the DC servo motor or the stepper motor and whats the diffrence? Another question if you don't mind, have you (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | DC Motor movement
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hi, The following command will cause the DC motor to rotote one after other according to the std lib and the command. hence, the robot will gradually slanted. It cannot travelled in a straight. motor (2, 100); motor (3,100); My question : how to (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Newbie Questions, Problems & Contributions...
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Hi, I have few newbie questions, and a contribution to make... Background info: ---...--- I have been playing with my HB for a week now, using the free IC 2.850 under NTServer4.0... So far, Ive been sucessfully able to control DC motors, send (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Where i can buy?
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I try to buy the flash ram type NM29A040 or TC58A040. Or another type of serial ram eeprom for my HB. But i don't know where i can find,buy it. Does anyone know who sell on-line, this IC's. Thank Fede. E-mail: fedsante@tin.it (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Question for Fred
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That's a funny question. I just finished a class on this exact topic. The basic determining factors when deciding whether to use a stepper motor or a DC brush/less servo motor is speed and open/closed loop control. Stepper motors are limited to (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Do It Yourself RF module????
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Hi, Now that the topic of RF commucation seems to arise again, I have a question too. After looking at the RF modules of radiometrix and linx I concluded that: 1. They are too expensive 2. They are probably not available here in the netherlands (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Help with overcharged batteries
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<<Last night we discovered that we had left our Handyboard on ZAP when we thought <<we had left it to trickle. It was left at this condition for about 6 hours. You probably should remove the battery pack, put it in a baggie, and take it to Radio (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Serial interface/ RF data link
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<<snip>> Unfortunately, I have not had any luck. This brings me back to the first point- is it possible to use the serial interface board by just providing the tx and rx lines? <<snip>> In short, no. The serial interface board takes power from the (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | persistent var's in IC
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Has anyone had problames with the Handyboard, IC 3.2 and 'persistent' variables? the following declaration works fine : persistent float i; but using an array: persistent float battery_voltage[ 320 ]; always causes an error while downloading : IC> (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Serial interface/ RF data link
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To properly comunicate with any PC you need to convert your TTL TX and TTL RX signals coming from the Handy Board to RS232 voltage levels. The charging board contains this interface IC called the "MAX232" The power wire is required unless you are (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Help with overcharged batteries
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Last night we discovered that we had left our Handyboard on ZAP when we thought we had left it to trickle. It was left at this condition for about 6 hours. This morning the motors are running very sluggish. Are our Handyboard or its batteries (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Serial Interface/ RF data link
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Sorry, the kit is from LINX Technologies (not LYNX) <A HREF="(URL)Linx Technologies -- Products</A> (URL) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Serial interface/ RF data link
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Let's say I want to use a serial interface board without the "charger", as the one provided with the Handyboard kit. The Tx and Rx lines are obviously required, but what about the ground and power lines?... Speaking of "easy to interface" data link (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: expand memory HB
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I'm running IC 3.2 and am curious why this fails : #define HOURS 10.0 /* hours of logging */ #define INTERVAL 5.0 /* minutes between samples */ #define SAMPLES ( (60/INTERVAL)*HOURS + 1 ) float battery_voltage[ SAMPLES ]; the message on download is (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | expand memory HB
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Hi. I have a question, i want to build a Datalogger with my Handyboard. How can i simply expand the data memory, i need at least 128Kbytes of memory. Thank. Federico Santello E-mail:fedsante@tin.it (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Re: start_process() questions
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(...) Yes. The subroutine acts just like any other function that you call. (...) Once you do a start_process, that subroutine will run indepently and concurrently with your main program. It does not "run out of time"... it will continue to run until (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Re: two way radio question and data link
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Details on Radio Data Modules as follows: I have called ABACOM Technologies --new phone # (416) 236 3858) and this is probably your best bet for voice or data use. Data & prices are from Circuit Cellar Ink magazine TRANSMITTER * 30 x 10 x 5mm * (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | start_process() questions
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Hi, I'm using start_process() to run a set of processes. My questions() are: 1. does start_process() re-initailize all the called process's (local) variables every time it calls the process? 2. If the process does not complete before its alloted (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | SPO 256
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F.Y.I. B.G. Micro no longer is selling the Text to speech IC "CTS256A-AL2" they only have the SPO256 IC in stock. This was confirmed by B.G. Micro on 12/07/98. According to a few people they still sold them as pairs as of 08/98 If anybody else is (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | spo256 -Reply
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I bought both from B.G. Micro. (They were not selling the 3.12MHz crystal, however, I successfully used a slightly faster (3.26??) clock. I assume the pitch of the voice was a little higher but it worked. -Drew (...) Does anyone know who sell's the (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | Re: spo256
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www.bgmicro.com about $5 or so for the chip ??? (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | re: www."hc11"
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wsomebody sent a list of www.'s from different source code for HC11 by mistake I erased please release then again thankx (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | communication problem
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Hi everybody I seek someone who can help me. I use handy board and xc40 board(it mounts xc4010 FPGA chip). And I have to make two board communicate each other. But there is a problem that I don't know the method. In handy board's F&Q page, It says (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Extra output for clocking (Using Hardware Output Compare)
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Hugo: I am not going to be able to answer this one fully. We will need to hear from others on the list to hear how to mix assembler code into an IC program, how to have the IC program modify assembler variables, and how to set up interrupt service (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | communication between two boards
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I use handy board and xc40 board(It has xc4010 FPGA chip) The problem is that they must communicate each other. But I don't know how I can make them communicate. In Q&A(at mit's handy board home page) it says that SPI pin can be used as digital (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | spo256
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Does anyone know who sell's the SPO256 and CTS256A-AL2 IC's (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | Re: hbdl.exe download prob
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Shiva, When the Windows hddl.exe complains that it cannot open the port, it is usually due to another Windows programming using / holding that serial port. Try all the comm ports to see if hbdl.exe allows it to open one of them, then attach the (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two Way Radio question
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I would think so, assuming that you keep the data rate relatively low (IMHO, 9600 bps would probably be pushing it, 2400 may be better) --phil (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two Way Radio question
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I am using a rug warior pro whose brain is very similar to the Handyboard and would like to know if these VHF radio Data Modules could be set up between the computer serial port and the Rug Warrior brain to provide a radio link instead of the 4 wire (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: two way radio question and data link
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Hi folks! I've found Terri Cherr's idea of using VHF data modules excellent, not only to exchange voice, but to communicate to a host computer also. The "robot" could send sensoring information to a computer (or even another robot) and receive (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two Way Radio question
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Another possible neat solution would be to use a pair of VHF radio Data modules at each end. These normally send digital data, but if you pulse width modulate / demodulate at each end then audio could be sent. There is a company that advertises in (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Looking for a Handyboard KIT
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Check out the MIT web site for vendors. I believe they list Gleason Research at a source. Here's the MIT web site: (URL) the web site for Gleason Research: (URL) this helps!!! Bill Denzel Senior Mechatronics Student California Polytechnic State (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Handy board for sale
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I have a handboard for sale, with display, only one L293D chip installed. Has passed all the checks in the assembly manual, as I understand them. $175.00 Also have a rug warrior board for sale, it is missing the L293D chip (it got put in the handy (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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The kit I used is DK-7 "FM transmitter bug" made by Marlin P. Jones & Assoc., Inc PO Box 12685 Lake Park, FL 33403-0685 (407)848-8236 FAX (407)844-8764 at least that is what is on the packaging label. It was $10 two years ago. I got mine at a local (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | hbdl.exe download prob
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Hi, My Hb displays MEMMORY FAULT whenever I turn it on. SO I figured runneing the hbdl.exe would help aleviate this situation. When I run it however, it says it cannot open the port! Anyone know why? I have made certain that the serail port is (...) (26 years ago, 5-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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I will look for the schematic. The one I built was a $10 kit I bought. Mike -----Original Message----- From: The Plumber <jhoffman@it.sait.ab.ca> To: michaelj@wt.net <michaelj@wt.net> Cc: handyboard@media.mit.edu <handyboard@media.mit.edu> Date: (...) (26 years ago, 5-Dec-98, to lugnet.robotics.handyboard)
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| | Re: handy board ic programs
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(...) (26 years ago, 5-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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I would be interested in any schematics you would be willing to give up, maybe even a little theory behind operation. I must admit I am lacking quite a bit in the communications area. Thanks, Joe Hoffmann E-Mail jhoffman@it.sait.ab.ca (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Sonar question
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That will only allow one half of the conversation. I suppose you could run with two kits, one receive, one transmit, both tuned to different frequencies. Another suggestion might be one of the cordless, battery operated intercom system units. Most (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Apple Microphones
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(...) I would only caution you that there are two types of microphones for the Mac -- regular mics and "PlainTalk" microphones. I suspect you are talking about a PlainTalk mic. The obvious distinguishing difference is the "longer than normal" male (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | handy board ic programs
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i just recived a new handy board in the mail and wonder if any one could email me some sample programs in ic or a web site to down load some. most of the programs that came with the handy board were for diferent controlers. thanks wayne email (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Sonar question
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Radio Shack have a small FM Transmitter kit . I think it was about $10. Regards, Terry Howsham (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Apple Microphones
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Has anyone used Apple computer microphones with their robots. The mic seems to have a left and right channel. It has a circuit board inside the case. I don't what the circuit actually does. It would great if I could just connect it to the handyboard (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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(...) CB radio's, Buisness radio (license needed), amateur radio (license needed, again), family radio (no license), etc. --phil (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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Yes, we have not only considered that idea, we have acted upon it. I guess the more operative question would have been: Is there a more efficient method of communication other than the wakie talkies? (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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That's a hard one because you have to have sufficient gain from the robot microphone to hear someone 2 to 8 foot from the microphone. Usually communication equipment limits their microphone gain on purpose to exclude background noise. You have to (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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(...) How about those teenie weenie FM radio microphones that they advertise "you can hear a wisper from 14feet away". Usually in "Electronics Now" and other magazines. (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Two way audio -Reply
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How 'bout a cheap pair of voice activated walkie talkies?? (...) Hi, We are trying to transmit our voices to our remote robot to create the impression that the robot is talking. In addition, we want to be able to hear what the robot hears. Does (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two way audio -Reply
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A couple of years ago I built a small FM transmitter that had a small microphone on it. I could hear whispers in the room next door when I turned it on and tuned in a small transister radio to its frequency. This may be an option. Mike (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Assembler math/PID
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Justin, Thanks for your reply. I assume you had one process doing the PID in a tight loop, and then had other concurrent processes doing other tasks. Was there ever a problem with the PID process not getting scheduled within the 1Khz system (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Two way audio
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Hi, We are trying to transmit our voices to our remote robot to create the impression that the robot is talking. In addition, we want to be able to hear what the robot hears. Does anyone know any products that we can attach to our robot that will (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Extra output for clocking
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Thanks for the advice on the ouput compare and portA. What I realized was the CPU time is being shared by some many functions, like the LCD printing, IR, PWM, that I'm not getting a fast enough pulse from the motor ports. I disabled a lot of these (...) (26 years ago, 4-Dec-98, to lugnet.robotics.handyboard)
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| | motor questions using motor(x,y)
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Hi all, The motor(x,y) function in the lib_hb.c file works as expected (the motor speed does vary depending on value given and the correct motor goes on), but when I actually have a motor in the header both LEDs go on! (and I get corresponding (...) (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Sonar question
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The Polaroid Sonar board requires a supply voltage less than 7 volts. The battery of the handy board is around 12, so you'll probably shorten the life of your sonar board considerably if you connect it straight in (i.e. burn it up :.)). The diodes (...) (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Sonar question
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(...) The battery for the handy board is a 9.6V cell (8 * 1.2V cells in series.) A normal 1n400X diode will drop 0.7V each. (6 * 0.7 = 4.2) 9.6 - 4.2 = 5.4V (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Sonar question
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I'don't even bother using diodes at all I just use a 7805 voltage regulator that is well heat sinked and never had a problem with it -----Original Message----- From: ruizvic@mx1.ibm.com <ruizvic@mx1.ibm.com> To: handyboard@media.mit.edu (...) (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | Re: 2sonar
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(...) I haven't used the transducer multiplexor myself; I decided to just hook up a second sonar module to the HB in the same manner as the first is hooked up. It looks like using the multiplexor ought to be fairly simple, though. First off, in the (...) (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | Sonar question
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Hi to all, I would like to know what difference there are if I connect the 6 diodes between the Handy Board & the Polaroid Sonar Card. Can I connect the cards without diodes? I tested the voltage at the Catode at the end of the 6th diode and my (...) (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | Assembler math/PID
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Hello, I am writing PID code that runs on the system interrupt. I am finding that I have to rewrite alot of the great math functionality available through IC. Does anyone know of a way to use an IC function on a regular system interrupt schedule? (...) (26 years ago, 3-Dec-98, to lugnet.robotics.handyboard)
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| | motor code questions
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Hi, I got my Handyboard up and going and was trying the following code for driving my motors. (Figure I would try known code before forking out on my own). The code I got from the 'Inspiration to implemntation' book. Anyways it does not seem to (...) (26 years ago, 2-Dec-98, to lugnet.robotics.handyboard)
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| | sonar
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what program to control about 2sonar.jpg? how i adjust program (sonar.c) for 2 sonar in picture 2sonar.c? (26 years ago, 2-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Hacking Servos
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Thank you all very much for your help :) Best, Andre. (...) ===...=== Andre Philippi - Applications Developer | Phone: 626-296-5016 philippi@corp.earthlink.net | Fax: 626-296-5113 Earthlink Network, Inc. | 3100 New York Drive (URL) | Pasadena, CA (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Hacking Servos
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Yeah, I remember seeing that one; I may actaully have the info at home... Anyway, an R/C servo has a hard stop to limit travel because the electronics use a simple potentiometer on the output shaft for position feedback. These pots typically have (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Hacking Servos
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(...) I put together a page with detailed instructions that has been used by a number of high school students without any problems. The robot is based on a Basic Stamp but the servo modifications are easy and work with any controller. (URL) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | Hacking Servos
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Howdy Folks :) I remember reading a web doc a while ago on how to convert servos so their shafts can rotate more than 180 degrees... It was a nice doc, with pics, schematics, and everthing... but I lost the URL... :( Does any one know what doc am I (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | Re: HandyBoard and iMac?
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It doesn't bother me that much: I haven't used a floppy in two or three years. I have ISDN at home: it's way faster than a floppy ;^). -- Eric (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | 2sonar
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i use circuit on 2sonar.jpg . if i use sonar.c program, how i adjust this program for 2 sonar trasducers. ?(a picture on 2sonar.jpg) i want to 1 sonar working single , don't together.or to alternate. Sonar number 1(#1)is working until check (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | 2sonar
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i use circuit on 2sonar.jpg . if i use sonar.c program, how i adjust this program for 2 sonar trasducers. ?(a picture on 2sonar.jpg) i want to 1 sonar working single , don't together.or to alternate. Sonar number 1(#1)is working until check (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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| | 2sonar
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i use circuit on 2sonar.jpg . if i use sonar.c program, how i adjust this program for 2 sonar trasducers. ?(a picture on 2sonar.jpg) i want to 1 sonar working single , don't together.or to alternate. Sonar number 1(#1)is working until check (...) (26 years ago, 1-Dec-98, to lugnet.robotics.handyboard)
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