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Adafruit Trinket - Mini Microcontroller - 5V Logic : ID 1501 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: SparkFun Qwiic Pro Micro - USB-C (ATmega32U4) - Compatible with Arduino development board 5V/16MHz microcontroller AP2112 3.3V Voltage Regulator Castellated PTH pin pads Reset button Maximum 6V input : Electronics
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Amazon.com: Mini USB Micro Controller Board Development Board, Micro Controller Mini Development Board for Raspberry Pi RP2040 Dual Core ARM Cortex M0+ Processor Microcontroller : Electronics
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CH551 is a $1.80 USB Mini Development board based on the 8-bit C51 micro-controller - Electronics-Lab.com
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USB Serial Port Adapter, Bus Communication 3.3V 5V USB Port Converter Module CH341A Chip With Working Status Indicator For STC Microcontroller Programming - Walmart.com
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