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| I am planning on useing two stepper motors as the drive motors for a robot that I am entering in the firefighting contest and I need help in interfacing them. I have motor driver chips that need a direction input and a pulse input and I need to know (...) (27 years ago, 2-Jul-97, to lugnet.robotics.handyboard)
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keith
(score: 0.993)
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| | Re:
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| (...) Looking at lib_hb.c: void motor(int m, int speed) { if (speed>100) speed=100; if (speed<-100) speed=-100; if (speed >= 0) _set_motor(m, 0, (speed + 3) / 14); else _set_motor(m, 1, (-speed + 3) / 14); } Keith (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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keith
(score: 0.993)
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| | Re: IR wall detection
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| Keith, Try an LM567. It's a tone decoder with PLL and VCO. Basically set the internal freq. of the 567 any where between .01 Hz up to I think 500 kHz. Feed a signal into the 567 and if the freq's match up, the 567's output goes low. I've been (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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keith
(score: 0.991)
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| | Re: IR wall detection
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| (...) Keith I think it works. I managed to get a bread boarded version of the IR sensor working. A 555 provides a 40khz carrier. The 555's reset pin is directly tied to pin 5 of a 567. The carrier is modulated by the internal freq of the 567. A (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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keith
(score: 0.991)
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keith
(score: 0.991)
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| | Re: I think I fried my board!!
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| keith-- you might have fried the motor ground to logic ground connection. a couple of times in my lab using 6.270 boards people shorted motor high to logic ground, with the result being a vaporized trace between the two grounds (the inductor was not (...) (28 years ago, 7-Jan-97, to lugnet.robotics.handyboard)
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keith
(score: 0.991)
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| | Re: sonar hookup
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| Keith> Just to fill all of you in, I followed Tom's advice and it is Keith> working now. I am going to install the resistor on BINH Keith> tonight so I will get the extended range. By the way, what Keith> value resistor is best for this signal? I (...) (27 years ago, 9-Apr-97, to lugnet.robotics.handyboard)
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keith
(score: 0.991)
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keith
(score: 0.990)
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| | Re: High power motor drivers
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| Keith Check the HB home page. Fred posted my info for a H-bridge that will handle two 12V-55V motors at 3A each. I know it's not exactly a custom bridge, but you can make the PCB from scratch. The LMD18200 from National makes this really easy. (...) (28 years ago, 28-Jan-97, to lugnet.robotics.handyboard)
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keith
(score: 0.990)
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| | Re: New motor drivers
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| Keith, How much current do your motors require. The SN754410 offers 1A per channel. If your piggy back them you can increase this to 2A/channel. Let me know. (...) (28 years ago, 20-Mar-97, to lugnet.robotics.handyboard)
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keith
(score: 0.985)
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| | Re: Sonar and the handyboard
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| Keith, On the ftp site under ???/contrib/kent/sonar there should be a file called sonartst.c This file tests the unit goven that you've included sonar.icb in the initial loading of library files. The file simply calls the ping(0) routine then waits (...) (28 years ago, 20-Mar-97, to lugnet.robotics.handyboard)
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keith
(score: 0.985)
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| | Re: Sonar problems
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| (...) Hi all, i just tested my polaroid sonar and it works great. Thanks to Kent and Adam. BTW..with the BINH, iwas getting 1"...but when i removed it as suggested by Chuck Manis (in some old mail)...it's reading the correct distances. So i guess (...) (27 years ago, 5-Apr-97, to lugnet.robotics.handyboard)
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keith
(score: 0.980)
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| | Re: I have a good schematic to post
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| Hi Keith. Send it to me and I'll post it for all. Please send as a GIF not JPG as this is better for line art & text (i.e., a schematic). I can decipher just about any encoding format so use whatever's easiest for you. -Fred In your message you (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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keith
(score: 0.980)
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| | Re: number conversions
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| Keith, The way to convert from floating point to int and vice versa in C is called typed casting. It is accomplished as follows: integer_number = (int)floating_point_number; for converting float to int. To convert the other way, simply type: (...) (27 years ago, 2-Jun-97, to lugnet.robotics.handyboard)
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keith
(score: 0.978)
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| | RE: converting binary to integer
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| you can do it on your fingers... each finger is a bit... no fingers is 0, pinky 1, ring 2, middle 4, pointer 8, etc... once you get it down, counting bits is a breeze... i (missing on finger) can count to 512... math is still pretty hard... but can (...) (27 years ago, 3-Jun-97, to lugnet.robotics.handyboard)
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keith
(score: 0.977)
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| | IR
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| Hello all, I've been playing with IR proximity sensors, and wonder if anyone can provide some suggestions. I hooked up an IR LED (Radio Shack 'high output IR LED') to the Handyboard's IR output with a 330ohm resistor in series (the smallest value (...) (27 years ago, 22-May-97, to lugnet.robotics.handyboard)
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keith
(score: 0.975)
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| | RE: converting binary to integer
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| that works... but try the finger method... it helps you under stand the concept by giveing you something tangible to work with ---...--- From: Jeff Keyzer Sent: Tuesday, June 03, 1997 10:38 PM To: Keith the wonder wookie Cc: Handy Board Subject: Re: (...) (27 years ago, 3-Jun-97, to lugnet.robotics.handyboard)
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keith
(score: 0.974)
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keith
(score: 0.966)
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| | Re: Smoking serial/charger board...!!!
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| I am having a similar problem (see notes below) - R11 is burning on the serial/charger board. My HB had been on the shelf for a month or so, and it may have been left on AND I had made the motor-power hack (I tapped the center of the battery pack to (...) (27 years ago, 28-Nov-97, to lugnet.robotics.handyboard)
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keith
(score: 0.963)
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keith
(score: 0.954)
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