3.3VDC 5mA to 12VDC 10A : What is the best way 3.3VDC logic output to run 120W 12VDC Component

[shootermcgavin]

I am working on a small project where I want to use a HC-SR501 PIR Sensor to active a 120W (10A) 12VDC unit.

The PIR sensor has a timer built in which is perfect as I want it to turn on for 20 seconds. When it detects motion is trips high to 3.3V TTL logic output. I want to use this 3.3V to activate the 10A 12VDC unit. I am using an old PC power supply to run the unit.

I was thinking relay or more likely a mosfet, although I have some automotive relays lying around and tried one but it wouldn't close, I believe they need 12VDC and substantial current through the coil.

What is the safest and most cost effective way to do this? The project box is small so I want it to be compact if possible.

Any help would be appreciated. Thanks in advance for your time.

 

[Visitor]

Use a relay module similar to this one. It's optically isolated so the relay kickback won't destroy the sensor board, and it only draws a few mA that the sensor board can deliver.

 

[shootermcgavin]

Perfect thank you! Exactly what I was looking for