ESP32 GPIO0

GPIO0 / ADC2_CH1 / TOUCH1 / CLK_OUT1

Use with care - Fine for many uses, but check the warnings below first.

What GPIO0 can do

Digital input/output
ADC2 analog input (unusable while Wi-Fi is active)
Capacitive touch sensing
PWM output (LEDC)

Warnings for GPIO0

ADC2 unusable with WiFi

ADC2 is used by the WiFi driver. Any analogRead() on an ADC2 pin returns errors while WiFi is active. Use ADC1 pins (GPIO32-39) for analog readings when WiFi is on.

Strapping pin

This pin is sampled at boot to configure the chip. GPIO0 must be HIGH (floating) at boot to boot from flash. LOW = download mode. Avoid pulling low with resistors or sensors at boot.

Open the interactive ESP32 pinout →

All ESP32 pins

GPIO0 · GPIO1 · GPIO2 · GPIO3 · GPIO4 · GPIO5 · GPIO6 · GPIO7 · GPIO8 · GPIO9 · GPIO10 · GPIO11 · GPIO12 · GPIO13 · GPIO14 · GPIO15 · GPIO16 · GPIO17 · GPIO18 · GPIO19 · GPIO21 · GPIO22 · GPIO23 · GPIO25 · GPIO26 · GPIO27 · GPIO32 · GPIO33 · GPIO34 · GPIO35 · GPIO36 · GPIO39

ESP32 Pinout Studio - free interactive pinout reference. Pin data generated from Espressif's official KiCad libraries. esp32pin.com