You should just be able to start 3 waveforms recording. You can actually make sure they start at the same time as well - search for synchronized waveforms inside the http://www.espruino.com/Waveform page
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.
You should just be able to start 3 waveforms recording. You can actually make sure they start at the same time as well - search for
synchronized waveforms
inside the http://www.espruino.com/Waveform page