 | | handy board analog inputs
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Hello, I am trying to run an assembly language program on the handy board without IC. Do the analog inputs on the handy board, marked 0-6 on the board correspond exactly to PE0-PE6 on the chip? Does the 0 input of J1 go directly to the PE0 pin? I (...) (28 years ago, 26-Feb-97, to lugnet.robotics.handyboard)
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| | use of op amp circuits with the Handy Board
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Does anyone know how to get a negative 5 volts from the Handy board for an op amp amplifier circuit or set equations to figure out the gain of an standard op amp as the 741 or LM339 using Vee as ground and Vcc as +5 VDC? The equations only seem to (...) (28 years ago, 26-Feb-97, to lugnet.robotics.handyboard)
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| | Umsubscribe
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Please unsubscribe me from the mailing list. (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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| | Turning IR xmitter on and off
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Hi all, I've had a few questions on this. The ir_xmit_on and ir_xmit_off routines that I use are in hb_ir.c. You could easilly write them yourself - ir_xmit_on just does poke(0x1000, 0x40) and ir_xmit_off does poke(0x1000, 0). Note that in hb_ir.c (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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| | sonar,radar
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Hello, I am building a robot with the handyboard at school with my lab parteners. you have seen them on the list before. Jim T., and Richard Vannoy. Our robot is doing fine with the IR's and bumpers. We have the handyboard software for sonar, but do (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motor Speeds
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(...) When I built the PWM controller out of a PIC I gave it 100 speeds representing 0 - 100% width. So a speed of 50 is a 50% duty cycle signaal. The disadvantage of the Handiboard scheme is granularity. In particular I have found that for really (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IR Collision avoidance
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(...) OK. (...) The transmitter is basically a modulator made from two 555 timer chips. One timer does 200-1000 Hz (we use 500) while the other does 38 KHz. On a scope, the output looks somewhat like.. |||...||| |||...||| |||...||| | | | | | | | | | (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IR collision avoidance
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Some comments and a few questions for Chris (...) We have "forward" and 45 degrees right". We wall hug to the right while you hug to the left. We ignore IR to left and use only the left contact switch for collisions (rare). (...) We had way too much (...) (28 years ago, 25-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IR Collision avoidance
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The Handyboard has a circuit (U7a, R4, C6) that generates a 38KHz signal. That drives an amplifier that then goes to J7, the IR LED output. If you hookup an IR LED to this jack (with a series resistor) then when you turn on TOC2 using ir_xmit_on() (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IR collision avoidance
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(...) I don't have the RS part numbers, but I bought them within the last few months so if there are "old" and "new" ones mine are probably "new". I checked out the RS web page and found that what they currently have is RS part number 276-137, and (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | IR Collision avoidance
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Chris or anyone who cares to respond, You put your message on the mailing list concerning the IR avoidance. I have a question about the hardware also. How are the leds powered? Are you pulsing them some way or what? I guess the decoder is what is (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IR collision avoidance
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This question seems to come up a lot here so I thought I'd post to the list rather than reply individually. Here's what I'm doing for IR collision avoidance. First, the hardware: I'm using 3 Radio Shack IR LED's in parallel and 3 Radio Shack IR (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Using PD2 and PD3
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I am building the circuit that is in the mobile robots book on pg. 108 to turn on and off my IR led's. Is it best to use the bit_set to turn them on and off? Where is the best place to get the 5 volts I need for the 74o4 chip? How do you read the (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IR collision avoidance
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Hey Chris, Thanks for the ideas, one questiom?. Can you pass along the Radio Shack part numbers? It seems like there are older and newer RS parts out there, what are you using? JTW In your message you said: (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Re: motor voltages
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(...) You can use diodes to drop the voltage but you need to attack the HB, cutting traces and so on. Depending on how you are mounting things, why not just use a lower voltage battery pack? Six Nicad cells give a nominal 7.2 volts, enough to drive (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motor Speeds
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(...) into (...) port. Consider implement PWM (for Motor Control) with second HC11, why not implement DC motor Controller with Frequency Lock Loop to control motor position and regulate motor speed? Suggested Specification: M68HC11 PWM Output using (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motor Speeds
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(...) Now this is starting to make sense. We use -100 to +100, but it does seem silly to have a resolution of 201. Much more logical that the routine converts to steps of lesser resolution, and 7 speeds certainly seem reasonable. (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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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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| | Re: More Motor Speeds
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(...) Either I'm confused or we're talking two different animals. Our pcode_hb.s19 that came with the Gleason Handyboard, allows variable motor speeds from motor(0,-100) to motor(0,100) with great and fine control. In our first test we converted (...) (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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| | Re: More Motor Speeds
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(...) You will have to rewrite the code in the interrupt functions. It isn't "hard" but it does require that you understand what IC is using the various timers for. The best documentation for that is the PCode itself. I don't believe you can use the (...) (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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