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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.
Gustav
I imagine you're using ESP8266 based on your other posts?
The ESP8266 ADC only has a voltage input range of 0 to 1v as far as I know, so yes - you'll only be able to read the first 1/3 or so of the potentiometer range if you connect it direct - you need to add another resistor between the pot and 3.3v to act as a potential divider and bring the voltage down.
If you don't want to do that then all the official Espruino boards have a full 3.3v range ADC.