Name: pIRkey - Python Programmable InfraRed USB Adapter
Brand: Adafruit
SKU: 3364

Logical pinout · physical placement not verified

USB A 5V
USB Type-A plug 5V supply; Adafruit Learn says the USB pads have Ground, D+, D- and 5V power, with 5V regulated down to power the pIRkey.
Type · PowerVoltage · USB 5V input per Adafruit Learn pinouts page.
USB A GND
USB Type-A plug ground connection; Adafruit Learn lists Ground as one of the USB pads.
Type · GroundVoltage · 0V
USB A D+
USB data plus line used by the onboard ATSAMD21E18 to send and receive USB data; Adafruit Learn states D+/D- are what the onboard chip uses to send/receive data.
Type · USB
USB A D-
USB data minus line used by the onboard ATSAMD21E18 to send and receive USB data; Adafruit Learn states D+/D- are what the onboard chip uses to send/receive data.
Type · USB
Reset button
On-board reset control; Adafruit Learn states one click resets and double-click enters bootloader mode.
Type · Control
DotStar APA102 MOSI
Internal DotStar RGB LED data line; Adafruit Learn says CircuitPython communicates with the DotStar over board.APA102_MOSI and board.APA102_SCK.
Type · GPIO
DotStar APA102 SCK
Internal DotStar RGB LED clock line; Adafruit Learn says CircuitPython communicates with the DotStar over board.APA102_MOSI and board.APA102_SCK.
Type · GPIO
Infrared receiver
On-board lensed IR receiver module at the end of the board; Adafruit Learn states it reads IR light from remote controls.
Type · GPIO

Pin	Type	Function	Voltage
USB A 5V	Power	USB Type-A plug 5V supply; Adafruit Learn says the USB pads have Ground, D+, D- and 5V power, with 5V regulated down to power the pIRkey.	USB 5V input per Adafruit Learn pinouts page.
USB A GND	Ground	USB Type-A plug ground connection; Adafruit Learn lists Ground as one of the USB pads.	0V
USB A D+	USB	USB data plus line used by the onboard ATSAMD21E18 to send and receive USB data; Adafruit Learn states D+/D- are what the onboard chip uses to send/receive data.
USB A D-	USB	USB data minus line used by the onboard ATSAMD21E18 to send and receive USB data; Adafruit Learn states D+/D- are what the onboard chip uses to send/receive data.
Reset button	Control	On-board reset control; Adafruit Learn states one click resets and double-click enters bootloader mode.
DotStar APA102 MOSI	GPIO	Internal DotStar RGB LED data line; Adafruit Learn says CircuitPython communicates with the DotStar over board.APA102_MOSI and board.APA102_SCK.
DotStar APA102 SCK	GPIO	Internal DotStar RGB LED clock line; Adafruit Learn says CircuitPython communicates with the DotStar over board.APA102_MOSI and board.APA102_SCK.
Infrared receiver	GPIO	On-board lensed IR receiver module at the end of the board; Adafruit Learn states it reads IR light from remote controls.

Logical pinout · physical placement not verified

Pin details

8 connections

USB A 5V
USB Type-A plug 5V supply; Adafruit Learn says the USB pads have Ground, D+, D- and 5V power, with 5V regulated down to power the pIRkey.
PowerVoltage · USB 5V input per Adafruit Learn pinouts page.
USB A GND
USB Type-A plug ground connection; Adafruit Learn lists Ground as one of the USB pads.
GroundVoltage · 0V
USB A D+
USB data plus line used by the onboard ATSAMD21E18 to send and receive USB data; Adafruit Learn states D+/D- are what the onboard chip uses to send/receive data.
USB
USB A D-
USB data minus line used by the onboard ATSAMD21E18 to send and receive USB data; Adafruit Learn states D+/D- are what the onboard chip uses to send/receive data.
USB
Reset button
On-board reset control; Adafruit Learn states one click resets and double-click enters bootloader mode.
Control
DotStar APA102 MOSI
Internal DotStar RGB LED data line; Adafruit Learn says CircuitPython communicates with the DotStar over board.APA102_MOSI and board.APA102_SCK.
GPIO
DotStar APA102 SCK
Internal DotStar RGB LED clock line; Adafruit Learn says CircuitPython communicates with the DotStar over board.APA102_MOSI and board.APA102_SCK.
GPIO
Infrared receiver
On-board lensed IR receiver module at the end of the board; Adafruit Learn states it reads IR light from remote controls.
GPIO

Start wiring

Single data line · I2C · 3.3 – 5 V · Breakout

Verify supply voltage and logic levels before powering up.

Module pins: USB A 5V, USB A GND. Schematik maps them to your board in the app.

Infrared

21 other options

TSOP38238 and TSMP96000 for remote-control receive and learn, Adafruit STEMMA IR transceiver for send/receive, IR break-beam and photoelectric switches for presence, and Grove/M5Stack MLX90614 modules for contactless temperature.

View all 21

Related groups

4 groups

Bluetooth

BLE 5-era modules (nRF52840, MDBT50Q), XIAO MG24 boards with Matter-over-Thread, Bluefruit UART/SPI bridges, HM-11 serial modules, and BLE sniffers cover different jobs and different hosts.

Wireless & comms · Bluetooth modules · 71 parts

Cellular

Adafruit FONA GSM breakouts, the Gravity Air780EU 4G Cat 1 module, Dragino NB-IoT Shield-B8, Pycom FiPy, Quectel and SIMCom M.2 5G modems, and the RockBLOCK 9603 Iridium modem each target a different network tier.

Wireless & comms · Cellular · 58 parts

GNSS & GPS

Adafruit Ultimate GPS (PA1616S/PA1616D), NEO-6M and NEO-M9N u-blox breakouts, Gravity GNSS BeiDou boards with I2C/UART, and 4G or LoRa RTK kits — accuracy and constellation requirements split them.

Wireless & comms · GNSS & GPS · 68 parts

LoRa & RF

RFM95W and SX1262 LoRa transceivers, Wio-E5 LoRaWAN modules, SX1302 gateways, Digi XBee mesh radios, 433 MHz ASK serial links, Dragino IoT sensor nodes, and the SDRplay RSP2 wideband SDR receiver.

Wireless & comms · LoRa & RF modules · 94 parts