IO 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.