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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
Great project. Surprised that the LDR is obviously fast enough because when discussing use of it in a different project - Help for Newbie. LED lights for game board , @DrAzzy deemed them too slow - see post #12. Of curse, the spacial setup controlling influence of ambient light plays a great role for the reliable working of LDRs.
Unfortunately most of the US meters for water, electricity and gas don't have such 'close access' - with good ambient light control - to the LED, if they even have a LED. A focusing photo diode or transistor could be the answer there, or a cheap scanner that goes after the dial(s) or display.