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timer circuit can do that. See for example, [http://pcbheaven.com/circuitpages/Voltage_Controlled_AC_Light_Dimmer/](http://pcbheaven.com/circuitpages/Voltage_Controlled_AC_Light_Dimmer/). The zero crossing detection
Espruino
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.