 | | analog expansion header
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How do you use the expansion header on analog inputs 0 to 3? I could not find specifics on its use in the documentations. Thanks, Nathan Marcantel nathanm@mail.utexas.edu 512-272-8024 6517 Carisbrooke Lane Austin, TX 78754 (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
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| | SPI Interrupts (Vector2X)
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I am at it again! I am trying to get the Vector2X working on the SPI bus of the handy board. I have read the docs, and they seem to make sense, however, I cannot get the code to work. I have the Vector2X running as a master, my assumption is that (...) (28 years ago, 26-Feb-97, to lugnet.robotics.handyboard)
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| | Re: handy board analog inputs
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yes, they do. In case you didn't know, schematic diagrams for the Handy Board are available from the web site. They show this wiring, including the fact that the user knob is wired to PE7. -Fred -- This message was composed using Articulate Systems' (...) (28 years ago, 26-Feb-97, to lugnet.robotics.handyboard)
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| | 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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| | Adding Functions to IC
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Is there a way to add functions to IC? Maybe they're already somewhere that I am not aware of. I need to add ir_xmit_on and ir_xmit_off to my functions list. I know that I can poke them but I just wondered if they were already on a functions list (...) (28 years ago, 26-Feb-97, to lugnet.robotics.handyboard)
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| | 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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