Mr. Koh Board

Mr. Koh ESP32-C3 RISC-V Development Board

The Mr. Koh is a birthday project for Mr. Koh.

Happy Birthday Mr. Koh! 🥳

Mr. Koh is an Open Hardware, Open Source (GPL3.0), ESP32-C3 RISC-V Developement Board.

Features

• RISC-V instruction set
• Espressif Systems ESP32-C3FH4 MCU
• 400K SDRAM and 4MB Flash memory
• Real-Time Clock support
• 10 GPIOs with RESET, BOOT, and RGB OUT
• RGB, power and data leds
• Built-in USB Type C flashing and JTAG debugging
• ESD protected
• FreeRTOS Supported when using ESP-IDF

Pinout

Files

• Datasheet
• Schematic
• BOM
• CPL (Position)
• PCB Front
• PCB Back

History

1. v1 Designed 01/23/2023.
2. v1 Sent to production 01/26/2023.
3. v1 Shipped 01/30/2023.
4. v1 Arrival 02/03/2023.
5. v1 Issues with USB Type C connector clearance and USB Type C pinout resulting in connectivity problems.
6. v1 LED was on all the time.
7. Rev 2 Carved out a space for the Type C connector and redid the PCB for correct pinout.
8. Rev 2 Removed Q1 and pull up, Pin GPIO2 is now just an LED. Reworked PCB to remove Q1 and R7.
9. Rev 2 Reworked the Pin Header pins to allow 5V from USB and to use that pin in place of USB.
10. Rev 2 Sent to production 02/06/2023, Shenzhen, Guangdong, China Time (UTC+8).
11. Rev 2 pcb finished 02/07/2023
12. Rev 2 assembly finished 2023-02-08 06:37:05 (local time).
13. Rev 2 waiting for Carrier to pick up completed boards.
14. Rev 2 delivered on Mon Feb 13 at 16:43
15. Rev 2 Tests indicate board is fully functional.

Photo