Motion Activated Alarm Kit

$9.99 + .99 s&h (We ship to U.S. only from Austin, Texas)




This is the most simple electronic project possible. And boy is it fun. These passive Infrared Motion Detectors (PIR) are amazing. Paired with the proper buzzer and a 9volt battery you will have an alarm that can do everything from alert you to a refrigerator raider to detecting someone trying to sneak into your motel room. And it’s fun trying to sneak by it without setting it off (ever see the movie ‘Sneakers?’) Included is a detailed schematic and instruction sheet to help you with the assembly.

Infrared sensor with control circuit board


The legendary HC-SR501 Adjustable Pyroelectric Infrared PIR Motion Sensor.
  • Product model :HC – SR501 human body induction module
  • Working voltage range:4.5-20 v dc voltage
  • Static current : < 50 uA
  • Level of output :3.3 V high/low 0 V (this is the voltage the signal pin will send out when motion is detected)
  • The sensor has two trigger modes: L not repeatable triggered/H repeatedly triggered (the default H) You change the mode with a little jumper block. (details in the schematic sheet)
  • Alarm activated time:0.5-300 seconds (adjustable) You adjust the length of alarm time with the little orange pots.
  • Circuit board dimension :32 mm * 24 mm

Also included is an Active Buzzer – 9V DC, 87DB (loud) and jumper wires to hook it all up.
We also included a 9v battery snap (high quality, not one of those soft ones that feel like they are about to tear apart when you disconnect them) and the correct jumper wires to make your connections to the mini-bread board a breeze.

If you are just beginning your journey into hobby electronics you can’t go wrong with this kit. It is simple and fun. Really fun. Educational, handy, and great for pranks
This kit includes:
  • PIR passive infrared motion detector (1)
  • 9v Active buzzer (1)
  • Mini bread board (1)
  • High Quality 9v battery snap (1)
  • Jumper wires (5) male/female
  • Detailed instruction and schematic sheet
  • Colors May Vary
  • $9.99 + .99 s&h (We ship to U.S. only from Austin, Texas)