Power Pins

  • VIN - this is the power pin. We have included an N-Channel FET driver on board for the IR LEDs that will take 3-5VDC. 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.
    • If powering with 5V, the board will draw about 200mA per LED (400mA total) when pulsing on.
    • If powering with 3V the board will draw about 100mA per LED (200mA total).
  • GND - common ground for power and logic.

Signal Pins

  • IRin - this is the input signal pin from the infrared receiver in the center of the board. When a 38KHz signal is received, the demodulated IR envelope is piped out the IRin pin into your microcontroller which will then need to decode it.
  • IRout - this is the infrared signal output pin. When the pin is high, the IR LEDs are on, when the signal pin is low, the IR LEDs are off.

The infrared receiver on this board is specifically for receiving 38KHz IR remote control signals - it isn't going to work for proximity/distance sensing or other frequency signals.

STEMMA JST PH

  • STEMMA JST PH - 2mm pitch STEMMA JST port for use with 4-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.
    • VIN - power input for the infrared receiver and infrared LEDs. It is the red wire on the JST PH cable. 
    • IRin - infrared signal input. It is the white wire on the JST PH cable.
    • IRout - infrared signal output. It is the green wire on the JST PH cable.

Signal LEDs and LED Jumpers

  • IN LED - In the center of the board, above the IR receiver, is the signal LED, labeled IN. It a yellow LED. It will light up when an IR signal is read by the IR receiver.
  • IN LED jumper - This jumper is located on the back of the board and is labeled IN. Cut the trace on this jumper to cut power to the "IN" LED.
  • OUT LED - In the center of the board, directly above the IN LED, is the signal LED, labeled OUT. It a yellow LED. Since humans don't see in IR, the OUT LED lights up to let you know when the IR LEDs are lit.
  • OUT LED jumper - This jumper is located on the back of the board and is labeled OUT. Cut the trace on this jumper to cut power to the "OUT" LED.

Power LED and LED Jumper

  • Power LED - In the bottom left corner, below the STEMMA JST PH connector, on the front of the board, is the power LED, labeled ON. It is the green LED.
  • Power LED jumper - This jumper is located on the back of the board and is labeled ON. Cut the trace on this jumper to cut power to the "ON" LED.

This guide was first published on Jul 09, 2024. It was last updated on Jul 18, 2024.

This page (Pinouts) was last updated on Jul 09, 2024.

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