BS2

sakulanaruto

My Dear:
I try to set 8 ultrasonic sensors on the Boe - Bot with the BS2 ,
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and the 8 ultrasonic sensors connect to 8 pins of the BS2 ,
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if I want the BS2 to process the 8 pins simultaneously (let the 8 ultrasonic sensors emit simultaneously),dose this way work ?

how can I write for the code using BS2 programming??

Best Regards ,

Peter Chou,

Kevin Wood

The Basic Stamps are single-tasking processors, so you can't process multiple instructions simultaneously. The Javelin and the SX chips can be made to multi-task, but again, the tasking isn't truly simultaneous.

The propeller chip, however, can do this. It has 8 independent cores, known as cogs, that could each process a sensor. If you might be interested in a Propeller-based robot controller, see this one: www.wulfden.org/PRC/

allanlane5

You can do each of the 8 sensors in a 'round-robin' fashion, finishing with one before you do the next.

Doing all 8 "simultaneously" could be a problem. If one 'hears' echo's coming from another unit -- how do you insure that the sound from #1 (for example) bounced off what #1 was pointing at? It could have been an echo from what #4 was pointing at.

And even a fast processor might have a problem starting the 'ping' at exactly the same time. Any delay in any sensor's start of ping could throw off the distance measure of an other sensor.

Chris Savage

All 8 pins could be triggered at the same time…But the BASIC Stamp needs the PULSIN instruction to read the return pulse width…That would not be possible on all 8 lines, as mentioned. ·But, even if it were, you would likely get interference from the sensors all transmitting at the same time from echo, etc. ·Take care.

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Chris Savage
Parallax Tech Support