ESP32 GPIO15

GPIO15 / ADC2_CH3 / TOUCH3 / MTDO

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

What GPIO15 can do

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

Warnings for GPIO15

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. GPIO15 must be HIGH at boot to suppress U0RXD log output. If pulled LOW, the ESP32 outputs debug messages on UART0 at 75 baud.

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