ESP32-C6_MICROCONTROLLER

Custom ESP32-C6 development board with USB-C power, RGB status LED, user input, I2C expansion, OLED support, UART programming access, and onboard temperature/humidity sensing.

This board is a small ESP32-C6 bring-up and sensor demo platform. It was designed to verify core power, boot/programming flow, GPIO, RGB LED control, I2C device detection, OLED output, and live environmental sensor readings.

Project Status

Bring-up demo verified.

The board has successfully run a combined test with:

• RGB LED control
• User button input
• I2C bus scan
• OLED output
• Live temperature/humidity readout
• UART programming through the J3 program header

Demo Features

• ESP32-C6 microcontroller core
• USB-C power input
• 3.3V regulation
• RGB status LED
• User button
• I2C expansion header
• OLED display support
• Onboard temperature/humidity sensor
• UART programming/debug header
• Reset and boot control for bring-up

System Role

USB-C / bench power
        ↓
ESP32-C6_MICROCONTROLLER
        ↓ I2C
OLED display + temp/humidity sensor
        ↓
bring-up demo / serial debug output

Key Specs

Item	Value
MCU	ESP32-C6
Main rail	+3.3V
Power input	USB-C
Programming path verified	UART through J3 program header
Display interface	I2C OLED
Sensor interface	I2C temp/humidity sensor
OLED address	0x3C
Temp/humidity sensor address	0x44
RGB LED behavior	Active-low
Board role	ESP32-C6 bring-up/demo board

Verified Working

• USB-C power input
• 3.3V regulation
• ESP32-C6 boot from flash
• UART programming through J3
• Reset button
• Boot button/manual boot sequence
• User button
• RGB LED
• I2C bus
• OLED display at 0x3C
• Temperature/humidity sensor at 0x44

Verified GPIO Map

GPIO	Function
GPIO3	RGB red
GPIO4	RGB green
GPIO5	RGB blue
GPIO23	User switch
GPIO6	I2C SDA
GPIO7	I2C SCL

RGB LED Notes

The RGB LED is active-low.

GPIO LOW  → LED color ON
GPIO HIGH → LED color OFF

Firmware should invert the LED logic when controlling the status LED.

I2C Devices

The following I2C devices were detected during bring-up:

Address	Device
0x3C	OLED display
0x44	Temperature/humidity sensor

Sample Verified Sensor Reading

Example live reading from bring-up:

Temperature: 29.2 C
Humidity:    35.0 %RH

UART Programming Notes

UART programming through the J3 program header is working.

Working connections:

USB-UART adapter	ESP32-C6 board
TX	ESP_RXD
RX	ESP_TXD
GND	GND

Manual Upload Sequence

Current working upload sequence:

1. Hold BOOT.
2. Start upload.
3. Tap RESET when the tool begins connecting.
4. Release BOOT after connection.
5. Press RESET after upload to run the application.

Native USB Status

Native USB enumeration still needs separate debug and validation.

Current programming flow uses UART through the J3 program header.

Bring-Up Checklist

1. Inspect USB-C and regulator soldering.
2. Power from USB-C and confirm +3.3V.
3. Connect USB-UART adapter to J3.
4. Use the manual BOOT/RESET upload sequence.
5. Verify boot from flash.
6. Run I2C scanner.
7. Confirm OLED at 0x3C.
8. Confirm temp/humidity sensor at 0x44.
9. Verify RGB LED channels.
10. Verify user button input.
11. Run combined OLED + sensor + LED demo.

Open Items

• Validate native USB enumeration.
• Improve programming flow beyond manual UART boot sequence.
• Add screenshots/photos of OLED and sensor demo.
• Add firmware example to the repository.

Repository Output Images

Expected image paths for GitHub README rendering:

Outputs/
  IMG/
    3D-T.png
    3D-B.png
    SCHEMATIC.png
    L1-SIG.png
    L2-GND.png

Safety / Design Note

ESP32-C6_MICROCONTROLLER is a low-voltage development board. Verify regulator output, USB wiring, and UART adapter voltage level before connecting external hardware.

Designed & engineered by Brandon Shelly.