Wiring: IR

IR is the classic proxy job: a device with only a remote, in a spot the hub can’t blast.

Transmit (ir.tx)

An IR LED driven through a transistor from a GPIO. Don’t drive the LED straight off a pin — IR LEDs want more current than a GPIO should source.

The GPIO only switches the transistor; the LED's current comes from 5 V through the 100 Ω resistor, so the pin never sources it.

Place the LED where it can see the device’s receiver (or tape it over the window).

Receive (ir.rx)

A 38 kHz IR receiver module (TSOP-style, three pins):

Three wires. The module does the demodulating; the GPIO just reads its output.

Use it to learn codes (via the IR driver) or to use an old remote as an input.

Tip

Which pins carry ir.tx / ir.rx are validated by the hub when you configure the proxy — it won’t let you assign a role to a pin that can’t do it.