ESP32-C3-MINI-1U-N4

📒 Datasheet

This repository is an atopile module for the ESP32-C3-MINI-*, a system-on-chip ESP32 WiFi/BLE chip.

• external antenna connector (ESP32-C3-MINI-1U-N4) or PCB antenna (ESP32-C3-MINI-1-N4)
• RISC­V single­core microprocessor
• 4 MB flash in chip package
• 15 GPIOs
• integrated USB controller

🏁 Get started

Installation

From inside a project directory terminal: ato install esp32c3-ato

Code

from "esp32c3-ato/esp32c3.ato" import ESP32C3_EXT_ANT
# - or -
from "esp32c3-ato/esp32c3.ato" import ESP32C3_PCB_ANT

from "generics/interfaces.ato" import Power
from "generics/interfaces.ato" import UART
from "generics/interfaces.ato" import USB2

module Esp:
    vdd3v3 = new Power
    uart = new UART
    usb = new USB2

    esp_ext = new ESP32C3_EXT_ANT   # external antenna connector
    esp_ext.power ~ vdd3v3
    esp_ext.uart ~ uart
    esp_ext.usb ~ usb

    # - or -
    
    esp_pcb = new ESP32C3_PCB_ANT   # PCB antenna
    esp_pcb.power ~ vdd3v3
    esp_pcb.uart ~ uart
    esp_pcb.usb ~ usb

GPIO pins are available as IO0 - IO19

🤔 Design Considerations

This is a minimal circuit:

• to use the USB lines to spec, you'll need to add your own resistors and capacitors per Figure 7, pg 25 of the datasheet
• there's no crystal in this design, it is required for light-sleep mode

⚡ Programming

The ESP32-C3 can have firmware uploaded with just a USB cable. No additional hardware is required, although this method isn't the best approach for a smooth development experience.

Connections

You'll need a USB breakout board or other means to access the cables and a 3.3 volt power source, not the 5 volt USB line. Tie all grounds together.

ESP		USB		3V3
ESP.D+ 🟨	~	🟨 USB.D+
ESP.D- 🟦	~	🟦 USB.D-
ESP.VCC 🟥	~		~	🟥 3V3.VCC
ESP.GND⬛	~	⬛ USB.GND ⬛	~	⬛ 3V3.GND

Procedure

1. Reset the chip while IO9 is LOW.
   • a reset can be accomplished by a power-cycle, or bringing the EN pin LOW then HIGH
2. Upload the firmware
3. Return IO9 to its default HIGH state
4. Power-cycle the chip to run normally

Arduino and PlatformIO

Arduino

• follow Espressif's instructions for adding ESP32 support.
• choose ESP32C3 Dev Module from the list
  • use USBSerial instead of Serial if using the same USB cable as you did for firmware upload

PlatformIO

[env:esp32-c3-devkitm-1]
platform = espressif32
board = esp32-c3-devkitm-1

🙏 Contributing

This design is intended to be a community best-effort at a minimal circuit combining:

• datasheet reference design
• readily available components
• modular and reusable layout

You are greatly encouraged to contribute or discuss any improvements here so that everyone may benefit.

License

CERN-OHL-P v2