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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.
@allObjects
Running with untuned antenna is bad... no antenna is even worse, and depending on the tx power setting, the chip may blow/ heat up. Bad antenna tuning / no antenna produces very high SWR and all the HF energy is reflected back into the chip, which easily explains the heating up of it.