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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.
@DrAzzy
The ESP-01 is the one with the 8 pins in 2x4 arrangement, right? If the hardware is unchanged, that doesn't work reliably without an external cap, at least in my experience. I think I put on either a 1 or a 10uf ceramic (you can even tack a through-hole cap on the far side of those 8 pins if not using the shim), and that seemed to work.