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ESP32 CH343P programmer

Overview

Main reference: [Verified] The ESP32 CH343P small-size programmer
brings out the VIO pin of the CH343P, allowing users to select between 3V3 and 5V TTL levels for serial communication.
Using a jumper cap, shorting the VIO pin and 3V3 outputs a 3V3 TTL level. Leaving the 5V pin connected or shorting it outputs a 5V TTL level.
Verified to successfully program the Heze ESP32-C3.
A BOM and link are attached.

Connection for programming the Heze ESP32-C3:

Programmer
Heze ESP32-C3

3.3V
3.3V

GND
GND

RX
TX

TX
RX

IO0
IO09

EN
EN

Design Files

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Update:2026-03-26 19:18:05

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