A normal pin is depicted on the left, switch 1 (S1) toggles the output between supply (V+) and ground (GND). Open collector mode In open collector mode, pins switch between a ‘disconnected ...
The open collector output (pin 1) pulls to ground when no object is detected, a 12K pull-up resistor (R1) holds the signal high when an object is detected. In the demonstration we connected the ...