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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.
Hansi
A0 is the analog input. Use a D pin like NodeMCU.D3, but do not expect to much, because pwm is poor on ESP8266 - check #914
Make sure you not blow it by draining to much current from a Pin, max is 12 mA.