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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
If the parts require 5v logic, you'll need to use a level shifter (these are readily available, and cheap).
That said - I don't know where you're finding these 5v-requiring "cheap" modules for arduino. Most of the cheap sensors I found were all 3.3v, and most would not take 5v. What kind of sensors were you looking for?
I went on a buying spree when i first got the Espruino, getting cheap sensors that ran on 3.3v, and I don't think I ever looked at one and rejected it because it was 5v.
A lot of vendors charge horrifying markups (vs component costs) for arduino shields, and even simple breakout boards *cough*sparkfuncough