

GPIO | Input | Output | Notes |
0 | pulled up | OK | outputs PWM signal at boot |
1 | TX pin | OK | debug output at boot |
2 | OK | OK | connected to on-board LED |
3 | OK | RX pin | HIGH at boot |
4 | OK | OK | |
5 | OK | OK | outputs PWM signal at boot |
6 | x | x | connected to the integrated SPI flash |
7 | x | x | connected to the integrated SPI flash |
8 | x | x | connected to the integrated SPI flash |
9 | x | x | connected to the integrated SPI flash |
10 | x | x | connected to the integrated SPI flash |
11 | x | x | connected to the integrated SPI flash |
12 | OK | OK | boot fail if pulled high |
13 | OK | OK | |
14 | OK | OK | outputs PWM signal at boot |
15 | OK | OK | outputs PWM signal at boot |
16 | OK | OK | |
17 | OK | OK | |
18 | OK | OK | |
19 | OK | OK | |
21 | OK | OK | |
22 | OK | OK | |
23 | OK | OK | |
25 | OK | OK | |
26 | OK | OK | |
27 | OK | OK | |
32 | OK | OK | |
33 | OK | OK | |
34 | OK | input only | |
35 | OK | input only | |
36 | OK | input only | |
39 | OK | input only |
ESP32 SPI FLASH PINS
- GPIO 6 (SCK/CLK)
- GPIO 7 (SDO/SD0)
- GPIO 8 (SDI/SD1)
- GPIO 9 (SHD/SD2)
- GPIO 10 (SWP/SD3)
- GPIO 11 (CSC/CMD)
ESP32 CAPACITIVE TOUCH GPIOS
- T0 (GPIO 4)
- T1 (GPIO 0)
- T2 (GPIO 2)
- T3 (GPIO 15)
- T4 (GPIO 13)
- T5 (GPIO 12)
- T6 (GPIO 14)
- T7 (GPIO 27)
- T8 (GPIO 33)
- T9 (GPIO 32)
ESP32 ADC PINS (18x12bits ADC)
- ADC1_CH0 (GPIO 36)
- ADC1_CH1 (GPIO 37)
- ADC1_CH2 (GPIO 38)
- ADC1_CH3 (GPIO 39)
- ADC1_CH4 (GPIO 32)
- ADC1_CH5 (GPIO 33)
- ADC1_CH6 (GPIO 34)
- ADC1_CH7 (GPIO 35)
- ADC2_CH0 (GPIO 4)
- ADC2_CH1 (GPIO 0)
- ADC2_CH2 (GPIO 2)
- ADC2_CH3 (GPIO 15)
- ADC2_CH4 (GPIO 13)
- ADC2_CH5 (GPIO 12)
- ADC2_CH6 (GPIO 14)
- ADC2_CH7 (GPIO 27)
- ADC2_CH8 (GPIO 25)
- ADC2_CH9 (GPIO 26)