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As of 2025-07-24

How to Write Sketches to ESP32

How to write sketches to the ESP32 mounted on TWELITE SPOT

This guide explains how to write Arduino sketches to the ESP32 mounted on TWELITE SPOT.

Connecting to the Host

Connect TWELITE R3 / R2

Connect the TWELITE R3 / R2 to the 7P interface (the side labeled ESP32).

Connect Power

Supply 5V power to the USB-C connector on the side.

Always connect the TWELITE R3 / R2 to the TWELITE SPOT in the same orientation as shown above. Connecting it incorrectly may damage the TWELITE SPOT or the TWELITE R3 / R2.

Operating Arduino IDE

Open the Sketch

Launch the Arduino IDE and open the sketch you want to write.

Select the Serial Port

From the Tools -> Serial Port menu, select the port for the TWELITE R3 / R2.

On Windows, the serial port name will be like COM?, and on macOS/Linux, it will be like /dev/tty?.

Start ESP32 in Programming Mode

Press the ESP32 reset switch EN(RST) and the ESP32 boot switch BOOT on the TWELITE SPOT, then release them in the order of EN(RST) -> BOOT.

By pressing BOOT while resetting, you can enter the ESP32 programming mode.

Execute Writing

Click the Write to Microcontroller Board button in Arduino IDE.

When writing is complete, Hard resetting via RTS pin... will appear at the bottom of the screen.

If writing fails and the following message appears, try changing the USB port or USB cable you are using.

A serial exception error occurred: Could not configure port: (6, 'Device not configured')

Reset ESP32

After writing is complete, press and release the ESP32 reset switch EN(RST) on the TWELITE SPOT to reset the ESP32.

If you do not reset, you cannot exit programming mode.