I’ve got a simple little board/socket assembled for my Dash. When the Dash is out of the socket, my sketch runs normally. When the Dash is in the socket, my sketch runs normally AND the System IC LED (the one in the opposite corner from the battery connector) is constantly lit. Obviously something on the board (just a few jumpers, pulldown resistors, and messy soldering) is doing something to light the LED, but I can’t figure out where it might be a soldering/wiring error.
What pins would be involved to light the System IC LED?
The pins I’m using are:
D8 - input for monitoring system power input, jumpered to USB_5V, with pulldown resistor to GND.
D16 - input for monitoring external switched loop, with pulldown resistor to GND.
D18 - output to provide power to switched loop