@chrisF wrote:
I am trying to use an automation pHat to activate a garage door opener. I’ve simply connected the two wires that run from the opener mechanism to the local “press for open/close” switch across the NO and COM contacts of the pHat relay. However, this mechanism only works for a while before the darlington driver (pins 1 -> 16 of the ULN2003A) driving the relay stops working. I’ve connected another darlington driver( pins 2->15 ) in place of the failed one and the same thing happens - after working for a few switches, the driver fails.
I’ve checked and everything on the relay side of the driver seems well within spec, but I am not sure what the transistor/regulator/? that is connected to the COM (pin 9) of the ULN2003A is supposed to do and whether it is working correctly. Any help would be appreciated.
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