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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.
@Gordon
This sounds great - Thanks for sharing what you're up to!
Since MIDI is basically just UART you could potentially use software serial on the Espruino Wifi for each channel (if you're sending only) - although at 115200 I don't know how reliable that'd be.
There are always I2C to UART converters like https://www.embeddedadventures.com/i2c_to_uart_mod-1025.html but to be honest if you have something working and the budget isn't a problem, using Picos sounds great and gives you loads of flexibility for doing more stuff later.