Page 47 - Ai Robogenius

BUILD A PIR SENSOR CIRCUIT

A PIR (Passive Infrared) sensor detects motion by measuring infrared
radiation from objects, like humans or animals. The sensor's output
changes when it detects a moving object, triggering an action. This
project will connect a PIR sensor to a simple circuit to control an LED,
lighting it up when motion is detected. The circuit is powered by 3 AA

1.5V batteries.
Signal Power Ground
To build the Motion Sensor Circuit, follow the given steps:

STEP - 1 Open a new circuit window in Tinkercad and rename your project (Motion Sensor

Circuit).

STEP - 2 Connect the Power pin of the PIR sensor to the positive terminal of the 3x AA 1.5V
battery pack.

STEP - 3 Connect the Ground pin of the PIR sensor to the negative terminal of the 3x AA 1.5V
battery pack.

STEP - 4 Place a 220-ohm resistor and connect one end of the resistor to the Signal pin of the
PIR sensor.

STEP - 5 Connect the other end of the resistor to the anode (positive side) of the LED.

STEP - 6 Connect the cathode (negative side) of the LED directly to the negative terminal of
the 3x AA 1.5V battery pack.

STEP - 7 Click on the Start Simulation button to test the circuit.

Introduction to Sensors in Tinkercad
45