Custom UART Programmer

A versatile UART programming board designed for microcontroller development with flexible voltage selection and multiple connection options. Features built-in status LEDs, CH340C USB-to-serial conversion, and support for external programming fixtures.

Hardware Overview

• USB-to-Serial IC: CH340C for reliable USB communication
• Voltage Selection: Jumper-selectable 3.3V or 5V operation
• Status Indicators:
  • Power LED (PWR)
  • TX/RX activity LEDs
• Connection Options:
  • Standard pin headers for jumper wire connections
  • FCP slot for external fixtures
• Interface: Standard UART (TX, RX, VCC, GND, BOOT, EN)
• Power Supply: USB-powered with onboard voltage regulation

Schematic

Getting Started

1. Driver Installation

   • Install CH340 drivers for your operating system
   • Windows: Download from manufacturer or use Windows Update
   • macOS/Linux: Usually plug-and-play

2. Voltage Selection

   • Set jumper to 3.3V for ESP32, ESP8266, and other 3.3V microcontrollers
   • Set jumper to 5V for Arduino and 5V-compatible devices

3. Connection Methods

   Method A: Direct Jumper Connections

   • Connect VCC to target microcontroller's power pin
   • Connect GND to target ground
   • Connect TX to target RX pin
   • Connect RX to target TX pin
   • Use BOOT and EN pins for programming mode control (ESP32/ESP8266)

   Method B: External Programming Fixture

   • Insert compatible pogo pin module into FCP slot
   • Align fixture with target board
   • Programming connections are made automatically

4. Programming

   • Open your preferred serial terminal or IDE
   • Select the correct COM port
   • Set appropriate baud rate (typically 115200)
   • Put target microcontroller in programming mode
   • Upload firmware

5. Status Monitoring

   • PWR LED indicates power is applied
   • TX LED flashes during data transmission
   • RX LED flashes during data reception

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