ESP32-S3 pinout: the DevKitC-1, pin by pin

This is the pinout of Espressif’s ESP32-S3-DevKitC-1, the board most ESP32-S3 tutorials use, with an ESP32-S3-WROOM-1 module on it. Its 44 pins are named by GPIO number, so the hole marked 4 is GPIO 4 in code. This page lists every pin with what it can do and what to watch for, then the strapping pins, the USB and PSRAM pins to avoid, the RGB LED, the power pins and which pin to use for what.

The circuit above is that board in Mokxi, walking its own RGB LED around the color wheel. The table is held to the same board model the simulator runs, and where the simulator does less than the chip, each row says so.

Four pins are read as the chip comes out of reset. GPIO 0 is the BOOT button: low at reset and the chip waits for an upload instead of running your program. GPIO 46 must not be high while GPIO 0 is low, and GPIO 45 high tells the chip its flash runs at 1.8 V, which the module’s flash does not, so the board will not start. GPIO 3 picks where the JTAG signals come from. Leave all four free of pull-ups and pull-downs of your own at power-on.

Mokxi does not model strapping. The simulated board starts whatever is wired to those pins, so check them before you build a circuit from here on a desk.

There is no plain LED on this board. There is an addressable RGB LED, a WS2812-type part, on GPIO 48 on the first boards and on GPIO 38 on v1.1. rgbLedWrite(RGB_BUILTIN, red, green, blue) sets its color, and digitalWrite(LED_BUILTIN, HIGH) lights it white. Mokxi’s board has a revision property that picks which pin it is on. The other LED is the power light.

5V is the USB rail and the input when there is no cable. 3V3, on two holes, is the regulator’s output, for the S3 and small sensors. The four G holes are ground. Every GPIO is 3.3 V and none is 5 V tolerant; keep each pin to an LED’s worth of current.