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francescovannini / espmeter

IoT smart gas meter gets your home gas consumption nicely charted on a web page. Build your own for less than 10€
GNU General Public License v3.0
55 stars 6 forks source link

Bipolar hall sensor #1

Closed stefaandesmet2003 closed 3 years ago

stefaandesmet2003 commented 3 years ago

Hi, congratulations with this interesting project. I tried something similar a while ago, the gas meter looks almost identical too. But I couldn't get the detection of the rotating magnet to work with a bipolar hall sensor like yours. I had ss41f, a cheap sensor from ebay. The output would turn on when the magnet passes, but never turn off, because of the negative Brp magnetic field required. How did you solve this? I also tried unipolar oh137, but it's not sensitive enough to be triggered by the magnet.

francescovannini commented 3 years ago

Hi! Thanks for you feedback. I guess I don't have this problem due to the fact that the sensor stays on only for a short amount of time, just enough to detect the magnet; then power is cut and I presume this is what resets the sensor.