Tasmotizer-PCB

USB-C connected serial and power for using tasmotizer with a variety of boards using 5 or 7 pin headers.

Ideal for reflashing Shelly modules, but also works with most of my PCB designs

• Very small USB-C connected module
• Includes 3.3V regulator to correctly power the Shelly (unlike many serial leads that just pass 5V from USB)
• Works seamlessley with tasmotizer web flash, and esptool from ESP IDF
• Tx/Rx/GPIO/RST have BAV99 diodes for ESD protection
• LED on Tx (CBUS0 so configuable in FTDI) shows working
• 3D printed case design included

Note FTDI config requires inverted RTS line, and ideally the CBUS0 LED setting on Tx. Tools are included to do this.

Available to purchase A&A (UART is already set up on these).

Pin out

The use of DTR and RTS on the serial port allow flashing of most ESP device without any additional BOOT or RESET buttons needed, and work directly with the esptool from the ESP IDF, and the tasmota web installer page. As the 5 pin header does not have RST the RTS switches the power to force a restart of the device. The 7 pin header has an RST to do reset.

5 pin header (ideal for Shelly 1, and most of my PCBs on this GitHub)

Standard 0.1" (2.54mm) spaced, square pin, header.

Pin	Use
1	GND
2	GPIO0 tied to DTR on serial port
3	3V3 power, switched by RTS on serial port
4	RXD data to device
5	TXD data from device

7 pin header (ideal for most other Shelly devices)

Small 0.05" (1.27mm) spaced, square pin, header.

Pin	Use
1	GND
2	GPIO0 tied to DTR on serial port
3	RST tied to RTS on serial port
4	3V3 power
5	RXD data to device
6	TXD data from device
7	Not connected

Pictures