 | | IR Collision avoidance —Bill Rose
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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 —Chris Moore
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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 —MAR ERICSON
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| | | | | | (...) What are the three LED's for? (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | | Re: IR Collision avoidance —Chris Moore
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| | | | | | (...) Those are the IR LED's - the one's that transmit the IR light that the receiver sees. Also, while I'm at it, I found out that the diagram above isn't completely accurate (I drew it from memory). The circuit I really use is like this: (...) (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | | Re: IR Collision avoidance —Jun Nolasco
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| | | | | | Hmmm. What voltage and/or LEDs are you using? Assuming 5V, your LEDs age passing only around half a milliamp of current. I am using a 100ma LED and I can only get less than a foot of detection. Am I missing something here? Jun Nolasco (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
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| | | | | Re: IR Collision avoidance —Richard Vannoy
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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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