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I/O Pin Attributes

Digital Pins

Label Digital In Digital Out PWM Out Analog In Analog Out Interrupt Notes
0 green green red red red 9 Also Serial_RX
1 green green red red red 10 Also Serial_TX
2 green green green red red 11
3 green green green red red 10
4 green green green red red 11
5 green green green red red 12
6 green green green red red 13
7 green green green red red 14
8 green green green red red 15
9 green green green red red 14
10 green green green red red 15
11 green green green red red 0
12 green green green red red 1
13 green green green red red 2 Also LED_BUILTIN
14 green green green red red 3
15 green green green red red 0

Analog Pins

Label Digital In Digital Out PWM Out Analog In Analog Out Interrupt Notes
A0 green green red green green 2 Also DAC0
A1 green green red green red 6
A2 green green red green red 5
A3 green green red green red 4
A4 green green red green red 9
A5 green green red green red 8
A6 green green red green red 7
A7 green green red green red 6
A8 green green red green red 5
A9 green green red green red 4
A10 green green red green red 7
A11 green green red green red 3
A12 green green red green red 2
A13 green green red green red 1 Also BEE_DTR

Other Pins

Label Digital In Digital Out PWM Out Analog In Analog Out Interrupt Notes
AREF green red red green red red Reference voltage for ADC
BAT_VOLT green red red green red red Battery voltage reading
BEECTS/MCU_RTS green green red red red 6 Bee CTS pin connects to MCU RTS
BEERTS/MCU_CTS green green red red red 7 Bee RTS pin connects to MCU CTS
BEEDTR green green red green red red Bee DTR pin, also A13
BEE_VCC red green red red red red Controls the BEE Vcc
CS_SD red green red red red red Chip select for the SD
LED_BUILTIN green green green red red 2 Built in LED, also D13
RI_AS green red red red red 1 Ring Indicator or Network Association*
VCC_SW red green red red red red Controls the Switched Vcc
*Selected using solder jumper SJ1.