If you search for “stm32f103c8t6 board” on eBay, you will get lots of hits for what is essentially a single product, to be called the “Blue Pill” from now on:
The price of these boards is absolutely incredible, you could get 10 of these for the same price as an official Arduino Uno. At these prices, which are lower than the official price quoted for the µC chip alone, it’s really tempting to permanently include one in every project.
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