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