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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fobus
@DrAzzy, thanks for your response.
Yes, Nucleo board is the cheapest that I can found in my Country, it is 14$. But I am going to buy more than 500 boards, that's why I'm looking for a cheap board. I need the cheapest soulution.