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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.
@Gordon
Hey, no problem! Yes, it is possible to use it - I believe just connecting, GND, power, SDA and SCL would be enough.
However it's not entirely simple as we don't currently have a library for the PCA9685 chip - so you'd have to send the I2C commands needed to control it using Adafruit's code (https://github.com/adafruit/Adafruit-PWM-Servo-Driver-Library/blob/master/Adafruit_PWMServoDriver.cpp) as a base.
I can definitely help you to do that if you want (and I'm happy to make a library so that it is really easy to use code with it), but I don't have a PCA9685-based board here so it might require a little bit of trial and error!
I should add that if you just want to control servos, you can just connect them straight to the Espruino WiFi - you should be able to control quite a few of them at a time without issues.