ESPFlash ESP32 Programmer

ESPFlash programmer is designed for simple programming of boards based on ESP32 and ESP8266 microcontrollers. It's used to flash firmware onto boards that lack a built-in USB-to-serial converter, whether during development or when programming boards before they ship. It includes all the electronics and logic needed to flash firmware by plugging a USB-C cable into the programmer and connecting it to the programming header. On-board circuitry handles the timing and signal sequence to put the ESP microcontroller into bootloader mode automatically.

The board has a 6-pin header with GPIO0, RESET, RX, TX, 3V3, and GND. It uses the CH340 USB-to-UART chip and connects via USB-C. We have made this board open-source, so all hardware design files are available for you to inspect or adapt. Our technical support is also there if you need help getting started.

It works with the Arduino IDE and with MicroPython firmware uploads via esptool, along with other standard ESP flashing tools. Installing the CH340 driver is all the setup required on the software side. Two mounting holes for M3 screws allow for secure installation, and at 38 x 22 mm it takes up minimal space in any build. Full setup and usage instructions are available in the Soldered documentation.