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Hi, I will show you how to hack a cheap pir sensor (1 dollar on aliexpress or ebay), for energy saving and power it from 3,6V to only 3V.

Step 1:

First you need to find the diode, a diode is and electronic component which allows current to flow in only one direction ad uses about 0,6-0,7V, so desolder it, and short its pins, now your sensor will works under 3,6V, at about 3V, you can use for example two 1,5V battery or a 3V coin cell for powering it, but is not anymore protected from wrong polarity connections, so you have to connect it correctly.

I hope you like it.

More info at: http://electrogreen.altervista.org/modificare-un-sensore-pir/

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