Topics created by PaulD

@PaulD One option is to use a voltage divider, to get the voltages down to 2,5/5V, and then design a schmitt trigger, to convert the 2.5/5V to 0/5V output swing. For schmitt trigger design you could have a look at http://www.aaabbb.de/NonInvertingSchmittTrigger/NonInvertingSchmittTrigger_en.php Another option, is to have a virtual ground at 6V, that you connect your arduinos ground pin to.. (It can not share the same powersupply as the PIR sensors then). The arduino will then see a voltage swing of 0-6V (Can be limited with a resistor / zener diode on the input on the arduino). The virtual ground can be created with a simple resistor divider, between GND and 12V line of the pir sensor. I would probably go for option 1, as it allows you for detecting if the PIR sensor is online (is there 6V on the signal pin?) and trigger another pin, in case it disappears.