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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.
@fanoush
I'd say there is not enough solar energy in such small area to charge device like bangle. Even pocket calculator that can live years on single button cell battery would probably not run from that photodiode.
I tried to use small solar panel with DS-D6 fitness tracker running Espruino, the panel was called "Solar Panel Mini 0.15W 5V 53*30mm" ($0.75 a piece on aliexpress) and during one very sunny summer day it almost managed to charge the tracker from empty to full. So since it lasts few weeks on one charge this panel would perhaps work as sustainable source even during cloudy days for some outoor BLE sensor.