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Topic: Reversing final pin state on StandardFirmata (Read 193 times) previous topic - next topic

Xephius

Aug 01, 2018, 01:03 am Last Edit: Aug 01, 2018, 02:56 am by Xephius
Hi all,

I am using the latest StandardFirmata build to interface with my tally light system. The standard behavior sets the pins LOW by default and they go HIGH when signal is sent. I would like to reverse that. Does anyone know of a build that does this already, or has it been documented elsewhere how to make this change?

In the existing setup, a pin goes HIGH and energizes an LED with 220 resistor to ground.

I need to change that such that the pin stays HIGH, and when signal is sent to the pin it would go LOW and ground a 220 resistor connect to an LED on positive voltage.

http://firmata.org/wiki/Main_Page


Attached is what I need to attache to the pin output.


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