3 ms·
I thought about keeping my existing doorbell button and chime, but adding an ESP32 plus hall effect sensor, to detect when the doorbell chime is being powered a
by rahimnathwani 2y ago
I thought about keeping my existing doorbell button and chime, but adding an ESP32 plus hall effect sensor, to detect when the doorbell chime is being powered and trigger a notification over wifi.
It seems a bit convoluted, though. Is there a DPST momentary button I can use instead (removing the need for the hall effect sensor)? I searched on digikey but 'DPST momentary' came back with results that were too bare (just the button), expensive ($50 per unit) and had a long lead time (8 weeks).
- tofof 2y agoWhy would you use a hall effect sensor at all, or a dpst for that matter? You just need two resistors. Just tap the dc leg between the bell and the chime into a voltage divider - for a 16V doorbell to a 3.3V esp32 io pin, r1=15k and r2=3.3k is exact - and you're done.
- rahimnathwani 2y agoThanks. This makes much more sense.
- tzs 2y agoHow common is DC in home doorbell systems? Most doorbell wiring diagrams I've seen in the US show systems that appear to be all AC.