SX Robot

Cenlasoft

Hello,
I want to make some robots similar to the BOEBot (homemade for some local schools). I hate to waste these chips and components. Plus the kids always like my science demos. I am a professor of Archaeology at a university in Louisiana. I am learning electronics for my hobby. I have used the SXB before and I was thinking I could use a 555 timer for send IR and using continuous sevos from Parallax (I have 10) to drive the robot wheels and the chips to detect IR. Is there a sample of such a robot anywhere?
Thanks,
Curtis

Zoot

You certainly don't need an external 555 for IR work -- the SX is more than capable of driving servos, sending/sampling IR, running behavior routines, etc., all at once. 20MHZ is a good speed to run the SX for this purpose -- gives you plenty of speed in the execution without the huge current hit of 50MHZ.

One example of complete 'bot on an SX is here: http://forums.parallax.com/showthread.php?p=814301 although this 'bot uses PWM for motor control instead of servo pulses (in honesty, using servos is simpler and requires much less of a hit ISR-wise).

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When the going gets weird, the weird turn pro. -- HST

1uffakind.com/robots/povBitMapBuilder.php
1uffakind.com/robots/resistorLadder.php

Cenlasoft

Thanks Zoot,

I downloaded the pdf, schematic, and code (zip). The code (zip) is not valid. Thanks for you help,

Curtis

Zoot

Try it now.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
When the going gets weird, the weird turn pro. -- HST

1uffakind.com/robots/povBitMapBuilder.php
1uffakind.com/robots/resistorLadder.php