Power Pins

• V+ - this is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V.
• GND - common ground for power and logic.

Signal Output

• Sig - this is the output signal from either the vertical or horizontal infrared receiver. When a 38KHz signal is received, the demodulated IR envelope is piped out the Signal pin into your microcontroller which will then need to decode it.

STEMMA JST PH

• STEMMA JST PH - 2mm pitch STEMMA JST port for use with 3-pin STEMMA JST PH cables. It has connections for:
  • GND - common ground for power and data. It is the black wire on the JST PH cable.
  • V+ - power input for the infrared receivers. It is the red wire on the JST PH cable. 
  • Sig - signal to your microcontroller. It is the white wire on the JST PH cable.

Selection Switch

On the top right of the board is a slide switch labeled V and H on the board silk. This switch selects between routing the vertical IR receiver or the horizontal IR receiver to the signal (Sig) pin. Switch to V for the vertical infrared receiver and switch to H for the horizontal infrared receiver.

Infrared Receiver Pins

The selection switch routes either the vertical or horizontal infrared receiver to the signal pin. We can't just tie the outputs together because they'd 'fight' each other and give incoherent output. However, it's possible to read each one independently thanks to the labelled breakout pads:

• IRH - breakout pad for the horizontal infrared receiver
• IRV - breakout pad for the vertical infrared receiver

Signal LED and Jumper

• Signal LED - to the left of the JST PH connector is the signal LED, labeled Sig. It is the red LED. It will light up when an IR signal is read by the selected IR receiver.
• LED jumper - in the center of the back of the board is a jumper for the signal LED. It is labeled SIG on the board silk. If you want to disable the signal LED, cut the trace on this jumper.

Power LED and Jumper

• Power LED - to the right of the JST PH connector is the power LED, labeled ON. It is the green LED.
• LED jumper - in the center of the back of the board is a jumper for the power LED. It is labeled LED on the board silk. If you want to disable the power LED, cut the trace on this jumper.