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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
Yes, looks like n needs to change, but that's not the issue here.
It's not that waveform has a lower limit, it's that it is using the adc in the background. If you use it and then access the adc with analogRead, occasionally they may try and use it at the same time, and you'll have problems