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Return to Previous Lesson: Create the Schematic of Your Motion Detector Alarm

Lesson Overview:

Now we'll build a working alarm!

Step 1: Introduction

In this Lesson, users build upon the knowledge acquired in the 123D Circuits Lesson to build a working prototype of the Motion Detector Alarm.

Step 2: Prepare the Breadboard

Begin placing the components on the breadboard.
Refer to Steps 1-5 of the 123D Circuits lesson if you want to review the function of each component.

  1. Begin with the breadboard oriented vertically. The power rails should be at the left and right sides of the breadboard and the lettered row should be at the top.
  2. The PIR Sensor has three wires attached: red (VCC), black (GND), and yellow (OUT). Connect the unattached end of the yellow (OUT) wire to breadboard position I5. Connect the unattached end of the black (GND) wire to the right negative (-) rail.
  3. Connect the unattached end of the red (VCC) wire to breadboard position I4.
  4. Connect the anode (positive) lead of the LED to breadboard position G8. The cathode (negative) lead should fall in breadboard position G10.
  5. Connect the 1.5k resistor between breadboard positions F5 and F8.
  6. Connect the black (negative) wire of the piezo buzzer to breadboard position I10.
  7. Connect the red (positive) wire of the piezo buzzer to breadboard position J5.

Step 3: Continue Preparing the Breadboard

Continue connecting the components to the circuit with jumper wires and connect the circuit to power.

  1. Connect a short red jumper wire between breadboard position J4 and the right positive (+) power rail.
  2. Connect a short black jumper wire between breadboard position J10 and the right negative (-) rail. Connect the black wire of the 9 volt battery clip to the negative (-) rail on the breadboard.
  3. Connect the red wire for the 9 volt battery clip to the positive (+) rail on the breadboard.
  4. Good Job! You successfully created the Motion Detector Alarm Project. Take your project to the next level by embedding your PIR sensor inside a secret space or unexpected location...perhaps inside of unsuspecting stuffed animals!

Step 4: Test the Circuit

Try out your motion detector alarm.

  1. Place the PIR sensor so it is facing an open, empty space.
  2. Connect the 9V battery to the battery clip.
  3. Move in front of the PIR sensor and see what happens! The threshold for the PIR sensor is high, so small movements will not trigger a response.
  4. Once the buzzer sounds, move out of range of the PIR sensor. The buzzer will go off and the LED will turn off after a few (albeit noisy!) seconds.
  5. Good Job! You successfully created the Motion Detector Alarm Project. Take your project to the next level by embedding your PIR sensor inside a secret space or unexpected location...perhaps inside of unsuspecting stuffed animals!

Congratulations, you have completed this project!

Check out other great projects here.

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