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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.
@Robin
Mon 2019.06.24
Without an op-amp of some kind, I don't believe there will be sufficient amplification (est micro-volts) from the tiny mic output, and possibly an impedance mismatch also. Trying to capture without that or a latch circuit, will hamper success. Even the A-D requires 700uv for a single digit. http://www.espruino.com/ADC
Do you have access to a scope to look at the mic output? If so, what is the range? If not, a spec/datasheet?