Eb-500 and PWMPal (Again!)
I am still a little confused on this issue. The info I found from last year's post indicates P0 on the EB-500 is for receiving. The specs show it's for transmission. This leads me to two assumptions that would make them incompatible.
The first is that the EB-500 could possibly transmit at any time and if the PWMPal could also be transmitting causing a conflict when the EB500 is pulling the line high and the PWMPal is pulling it low or vice-versa. Unless the transmit pin on the EB-500 is open collector it could possibly be shorted out.
The second is tied to the first assumption. If the EB-500 is open collector two sources transmitting on the same line at the same time could produce garbage on the input on the BS2.
It still may be able to be used but the timing of the EB-500 and the PWMPal communications would have to be handled very carefully to remove any possible conflicts.
Am I right in these assumptions?
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What electronics need - MORE POWER!!!!!!!
Post Edited (blittled) : 6/18/2009 9:15:04 PM GMT
The first is that the EB-500 could possibly transmit at any time and if the PWMPal could also be transmitting causing a conflict when the EB500 is pulling the line high and the PWMPal is pulling it low or vice-versa. Unless the transmit pin on the EB-500 is open collector it could possibly be shorted out.
The second is tied to the first assumption. If the EB-500 is open collector two sources transmitting on the same line at the same time could produce garbage on the input on the BS2.
It still may be able to be used but the timing of the EB-500 and the PWMPal communications would have to be handled very carefully to remove any possible conflicts.
Am I right in these assumptions?
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
What electronics need - MORE POWER!!!!!!!
Post Edited (blittled) : 6/18/2009 9:15:04 PM GMT
Comments
Stamp.
The PWM Pal uses pin 0 for serial communcation and is a dedicated pin.· Therfore, the two devices are not compatible on the same board.
Dave
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Dave Andreae
Parallax Tech Support·