$10 microcontroller with USB-C, BLE and lipo! : r/ErgoMechKeyboards
USB Microcontroller Case (3D Printed) — ameriDroid
8051 Microcontroller Development Board with USB cable - eComponentZ
USB-UART CH340C converter board
Nano Microcontroller R3 Unsoldered (Compatible with Arduino Nano) - Type-C USB - hit.ps
CH551 is a $1.80 USB Mini Development board based on the 8-bit C51 micro-controller - Electronics-Lab.com
USB to TTL 2-in-1 STC STM Microcontroller Serial Port Downloader CHT341T USB to I2C IIC UART Conversion Module - AliExpress
Tomu: A Microcontroller For Your USB Port | Hackaday
Microcontroller Development tools on USB stick - Do It Easy With ScienceProg
Pololu - Wixel Programmable USB Wireless Module
Amazon.com: TISEKER Mini Nano V3.0 ATmega328P Microcontroller Board with USB Cable for Arduino : Electronics
Ch552g Development Board / Core Board 8051 Usb Microcontroller Ch551g / Ch552g / Ch554g Wch - Demo Board - AliExpress
Arduino Micro USB Microcontroller
USB UART ISO Click
Adafruit Trinket - Mini Microcontroller - 5V Logic : ID 1501 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Arduino Uno R3 USB Microcontroller - RobotShop
Pro Micro (USB-C Version) - 5V/16MHz - Arduino-compatible ATmega32U4 – Keebio
Pro micro atmega32u4 5V/16MHz Development board microcontroller with bootloader IDE and USB C
Arduino Nano USB Microcontroller v3 (China) - RoboticX
Arduino Nano Micro-Controller with ATmega328P 16MHz 5.0V CH340G USB – Envistia Mall
USB C Type-C Nano V3.0 ATmega328 5V 16M Microcontroller CH340G Board For Arduino | eBay
Microcontroller Board Atmega328 with USB cable
![Cheap USB Host Microcontroller [CH559, ESP32, HID] - YouTube](https://i.ytimg.com/vi/po3FBdY0GS4/maxresdefault.jpg "Cheap USB Host Microcontroller [CH559, ESP32, HID] - YouTube")