Particle Monitor One, Manual

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Pin Name Description SoM Pin MCU
NFC2_VIN_EN GPIO (used for relay on I/O Card) 27 P0.10
NFC1_PERIPH_INT Peripheral interrupt (active low) 26 P0.09
TSOM_A7 / D7 A7 Analog in, GPIO D7, PWM, SPI SS, WKP 38 P0.05
TSOM_A6 / D6 A6 Analog in, GPIO D6, PWM, SPI (SCK) 39 P0.04
TSOM_A5 / D5 A5 Analog in, GPIO D5, PWM, SPI MISO 40 P0.29
TSOM_A4 / D4 A4 Analog in, GPIO D4, PWM, SPI MOSI 41 P0.29
TSOM_A2_BUTTON / D2 External user button, A2 Analog in, GPIO D2, PWM 57 P0.28
TSOM_A3_BATT_TEMP / D3 Battery temperature sensor, A3 Analog in, GPIO D3, PWM 58 P0.30
RX / D9 Serial1 RX, GPIO D9, PWM, Wire3 SDA 71 P0.08
TX / D8 Serial1 TX, GPIO D8, PWM, Wire3 SCL 72 P0.06
On the Monitor One, pins A0 and A1 are used in I2C mode by the user RGB LED temperature
sensor. Pins A0 and A1 cannot be used as GPIO.
On the Monitor One, you should not use A2 and A3 as GPIO or analog inputs as they are used by
the external user button and battery temperature thermistor.
All GPIO are 3.3V and are not 5V tolerant.
When using the I/O Card:
Pin Direction Function
A4 Output Direction control for RS485
A5 Digital Input Slow signal input, optoisolated, 12V to 24V = HIGH
A6 Analog Input Analog input, 0-10V, 10V=4095
A7 Analog Input 4-20mA, 4mA=0, 20mA=4095
NFC_PIN2 Output Relay coil, HIGH = energized
GPIO