PIR Motion Sensor Driving Circuit

Thread Starter


Joined Oct 28, 2014
PIR Motion Sensor, Driving a, n-Channel MOSFET Circuit

Just wondering if my circuit diagram is accurate, or correct. When it detect motion, it sends out 3.3vdc to an n-Channel Mosfet (GATE).

The load can be anything I want to power, requires DC power only.


So what do you think? Is it correct?

Also here is the link to the PIR on eBay. Clicking Here, will take you to the product page on eBay.

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PIR Specifications :
Operating voltage range : DC 4.5-20V
Quiescent Current : <50uA
Level output : High 3.3 V /Low 0V
Trigger : L can not be repeated trigger/H can be repeated trigger(Default repeated trigger)
Delay time : 5-200S(adjustable) the range is (0.xx second to tens of second)
Block time : 1S(default)Can be made a range(0.xx to tens of seconds
Board Dimensions : 32mm*24mm
Angle Sensor : <100 ° cone angle
Operation Temp : -15℃-+70℃
Lens size sensor : Diameter:23mm(Default)

Also, for the n-Channel Mosfet, If you Click Here, you will be directed to Mouser Electronics, for the product page.

n-Channel MOSFET Specifications :
Mouser Part # : 942-IRLB3034PBF
Manufacturer Part : IRLB3034PBF
Product Category : MOSFET
RoHS :
Mounting Style : Through Hole
Package / Case : TO-220-3
Number of Channels : 1 Channel
Transistor Polarity : N-Channel
Vds - Drain-Source Breakdown Voltage : 40 V
Id - Continuous Drain Current : 343 A
Rds On - Drain-Source Resistance : 1.4 mOhms
Vgs - Gate-Source Voltage : 20 V
Vgs th - Gate-Source Threshold Voltage : 2.5 V
Qg - Gate Charge : 108 nC
Maximum Operating Temperature : + 175 C
Packaging : Tube
Brand : International Rectifier
Configuration : Single
Fall Time : 355 ns
Forward Transconductance - Min : 286 S
Minimum Operating Temperature : - 55 C
Pd - Power Dissipation : 375 W
Rise Time : 827 ns
Factory Pack Quantity : 50
Transistor Type : 1 N-Channel
Typical Turn-Off Delay Time : 97 ns
Typical Turn-On Delay Time : 65 ns
Last edited:

Thread Starter


Joined Oct 28, 2014
1k seems low for a pull-down resistor.
Sorry.. I didn't label the Resistor.. The resistor is a 1 Watt, 15k Ω Resistor, 1% or 0.1% Tolerance, 50 ppm

The Resistor is just a resistor.. I'm sorry that it has color coding bands on it.. The bands mean nothing in this circuit demonstration. Disregard the color coded bands on the resistor. Maybe I'll just change em anyways.