ESPNut-D1

ESPNut-D1 (pronounced as "ee yes peanut") is a Serial Auto-Programmer for the ESP32 & ESP8266 microcontrollers from Espressif. While there exists many such programmers, ESPNut-D1 is a completely open-source hardware (OSHW) project designed in the KiCad open-source EDA tool. D1 is the first design variant of this project. You can download the source files of this design, modify them and redistribute them as you wish.

ESPNut-D1 is based on the popular CH340 series USB-to-Serial converter chip from WCH. The serial port of the chip connects to the target microcontroller through its own serial port. Thanks to the built-in serial bootloader of the ESP series microcontrollers, you can effortlessly program them at any time. The ESPNut-D1 makes this process a bit more convenient.

Features

• CH340/CH340G USB-to-Serial converter chip.
• USB-C connector.
• Auto bootloader and reset circuit. Control both functions from the USB.
• Dedicated push-buttons for reset and boot mode.
• 3.6~12V in, 3.3V out, 500 mA LDO.
• Target power control through P-Mosfet.
• Dedicated push-button for power control of the target. Useful for boards without reset pin.
• 6-pin ESP-PROG 1.27 mm header.

Design

• Parent Project: ESPNut
• Variant: ESPNut-D1
• Author: Vishnu Mohanan (@vishnumaiea)
• Latest Revision: R0.1
• Layer Count: 2
• Thickness: 1.6 mm
• Dimensions: 44 x 20 mm
• EDA Tool: KiCad V9
• License: MIT

Contributing

If you would like to contribute this project, you are welcome to post issues and feature requests on the Issues page. If you fork this project and created a new variant, you can let us know about it and get a unique identifier assigned for your project. The ID takes the following form.

Y<digit><letter><digit>

Y – Constant prefix.

<digit> – Digits from 0–9

<letter> – Characters from A–Z.

Examples:

Y1A1
Y1A2
Y2B1
Y3C4

The forked project should then be renamed to ESPNut-D1-<ID> form.

Guidelines:

• IDs are assigned upon request. You can create a new issue to request a new ID once a fork is created. Keep the issue title as Request New ID and include a link to your fork in the description.
• You can either request a new ID that you like and that is already not chosen, or allow us to choose an ID for you.
• You should rename the original source files with the ESPNut-D1-<ID> format.
• On the PCB, you can place the name of the project as ESPNut-D1 and keep the ID as a standalone text on any visible layers.
• Once a unique ID is assigned to a forked project, the revision should be reset to R0.1. Do not keep the original revision of the project.