Installing IR detector and emitter

• Emitter is usually clear

• Detector is not clear

Blink 2x per second - failure to initialize MCP (port expander)

Blink 1x per 2 seconds - normal heartbeat

• 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.

• IR TX/RX

• 1-long lead

• 2-short lead

• 3-short lead

• 4-long lead

Open

Open

Open

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