Search found 3 matches

by andydj
Mon Jan 14, 2019 9:57 pm
Forum: General Discussion and Questions
Topic: Sensing sound from a speaker
Replies: 9
Views: 468

Re: Sensing sound from a speaker

I thought I'd put in an update: I got it working. Thanks for the hints! The voltage on the LED pads read as about 1.8 volts, and this was confirmed by looking at it with the oscilloscope at my makerspace. So, being aware of the 1 volt upper limit on the ADC, I had to look at how to make a voltage di...
by andydj
Fri Jan 11, 2019 9:46 pm
Forum: General Discussion and Questions
Topic: Sensing sound from a speaker
Replies: 9
Views: 468

Re: Sensing sound from a speaker

Thanks, all. Some useful points. It doesn't have an LED, but I've now opened it up to have a look, and it DOES have 2 unused pads on the PCB, one of which connects has a small SMD resistor on it, and the other is on the ground plane. Looked to me like it was intended for an LED option, especially si...
by andydj
Thu Jan 10, 2019 8:25 pm
Forum: General Discussion and Questions
Topic: Sensing sound from a speaker
Replies: 9
Views: 468

Sensing sound from a speaker

MicroPython newb here. Know python, arduino, some basic electronics, now venturing into MicroPython Land. Everybody's got to start somewhere, right? I recently bought a D1 Mini clone, with a view to using the wifi capabilities. What I want to do is detect whether my doorbell is ringing, and if so se...