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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
...sure, give it a try... Since you want to use PWM and quite some Web access, I'd chose an Espruino-Wifi.
Depending how you code it in JavaScript, Wemos D1 mini can work. You have to be aware that the ESP8266EX - which is the core - has to tend unconditionally every so often to the Wifi stack, and if you have some blocking code running - code that runs beyond the time of the window between the tending to the Wifi, ESP8266 / Wemos D1 mini will reset... not exactly what you are looking for.
A more robust solution it Espruino Wifi, where the ESP8266 ESP-07(s) - mounted on it has just to do with Wifi and your application with all the features runs on Espruino STM32F4.
Starting with Wemos D1 mini does no harm... you always can move up to pair it with a Pico to not throw Wemos D1 mini out... latter will then just do Wifi, and the Pico does your application work.
But as said, Espruino-Wifi is the more elegant solution...