Скачать или смотреть Yale Burglar Alarm: How to power a PIR motion sensor with a USB charger

Yale Burglar Alarm: How to power a PIR motion sensor with a USB charger? (#114)

Model: HSA 3500

Our house has a door bell originally powered by a AC-DC converter installed inside the electric meter box. After the orginal DC converter failed, I installed a socket and used a USB charger to keep the door bell working. Now I install the PIR motion sensor just below the door bell in order to make the sensor powered by the door bell. Therefore the question can be refined as:

How to power a door bell with a USB charger?
How to power a PIR motion sensor with a door bell?

As the USB charger provides 5 volts and the PIR motion sensor required 4.5 volts, I used a resistor inline to reduce the voltage received by the sensor to some extent.

Hey, you never need to change the batteries again!

Hope this help someone!
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