I’m thinking of making a device that can measure time between…
an IR reflectance sensor being triggered by the passing of a reflective sticker (between 10-20cms away)
and the detection of a short sound from some form sound sensor.
This probably isn’t too complex but as a relative novice I’d greatly appreciate any advice on what sensors to get and how to go about programming+circuitry.
The cheaper the better
Thanks, look forward to your replies