Installing IR detector and emitter

• Emitter is usually clear

• Detector is not clear

Wiring to PCB

• J5 is primary optical connection for separating block A from block B

• Pin 1 is the square pad

• TX (emitter is pin 1 and 2). IR LED is forward biased with anode to pin 1

  • Flat side of LED is the cathode

• RX (detector is pin 3 and 4). Detector is reverse biased. Just flip it around and see what works, it will not blow up.

Open

Open

Version 1 build

Known issues

1. Need caps on current sense transistors else the port expander can’t see them properly trip

   1. v2 design comprehends all issues

2. CAT5 connectors are mis-labelled for A and B connections

3.