Turnout Sensor Header
This header plugs into the 2x20 header of the Raspberry Pi 3B+ (3A) to bring out 26 GPIO pins and ground.
- On the left is a single 3-pin header with 2 output GPIO pins and ground to control two LEDs to represent traffic density to and from the laptop (4) and the TrainThing hardware.
- The three 3x4 headers are for 12 3-pin plugs to connect Wabbit turnout status outputs to the Raspberry Pi. Each 3-pin connection is 2 input GPIO pins and ground.