Hi I would like to build my own alarm with one arduino and some door contacts . Door contacts can be hack easily by shunting the 2 wires . I read some articles where they add 2 resistors. I thing one resistor is in series with the door contact, the 2nd resistor is in parallel with the 2 first co…

Alarm diy with arduino

Paul_KD7HB August 21, 2021, 4:14pm 10

Noise is always a problem. Design your system based on CURRENT, not voltage.
Paul

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