The Arduino Nano ESP32

An ESP32-S3 on the classic Nano outline, with the Nano's pin names, an orange LED on D13 and an RGB LED.

What it is

The same Xtensa LX7 chip as the ESP32-S3-DevKitC-1, inside a u-blox NORA-W106 module, at 240 MHz, on a board 45 by 18 mm with two fifteen-pin rows 0.6 inch apart. The USB-C socket goes to the chip's own USB, and both it and UART0 reach the serial monitor. It runs at 3.3 V.

Pin numbers: build by GPIO number

Arduino's core for this board has two pin numberings, chosen under Tools, Pin Numbering. Mokxi builds by GPIO number ("By GPIO number (legacy)"), so a bare number is a GPIO: 13 is GPIO 13, which is A6. The names are defined for you and mean the right pin under either setting, so write D13, A0 and LED_BUILTIN rather than bare numbers.

Pin	GPIO	Also
D0 (RX0)	44	UART RX
D1 (TX1)	43	UART TX
D2 to D7	5 to 10
D8, D9	17, 18
D10	21	SPI SS
D11	38	SPI MOSI
D12	47	SPI MISO
D13	48	SPI SCK, the orange LED
A0 to A3	1 to 4
A4, A5	11, 12	I2C SDA, SCL
A6, A7	13, 14
B0	46	the RGB LED's red
B1	0	the RGB LED's green, and BOOT

VBUS is the USB 5 V. VIN is the input to the board's regulator, which is not modeled, so it is left open.

The LEDs

LED_BUILTIN is the orange LED on D13, which lights when the pin is HIGH. The RGB LED is common anode: LED_RED (GPIO 46), LED_GREEN (GPIO 0) and LED_BLUE (GPIO 45) each light when the pin is LOW. Blue is on a GPIO no pin reaches.

WiFi

It joins Mokxi's simulated network, with the network name and password as properties of the board. There is no radio, no 802.11 and no real internet: Simulated WiFi says what is faithful and what is not. The one exception is the Real internet switch in the Cloud panel, which sends requests for other names out through Mokxi's gateway.

What is modeled

The DevKitC-1 model's chip, whole: one Xtensa LX7 core, GPIO through the GPIO matrix, UART0 and the USB serial port, the timers, ADC1, LEDC PWM and the RMT.

What is not modeled

Arduino pin numbering (the default in the Arduino IDE), the regulator behind VIN, the PSRAM, the second core and a real radio. Bluetooth LE is simulated: a phone in the editor's Bluetooth pane, not a real radio.

Common mistakes

digitalWrite(13, HIGH) to light the LED. Here 13 is GPIO 13. Write digitalWrite(LED_BUILTIN, HIGH) or digitalWrite(D13, HIGH).

Starter project

Nano ESP32 blink is the board across a breadboard, flashing the orange LED and walking the RGB LED through its colors.