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In everyday life, sensors are used to gather information and trigger actions. Building physical
circuits can be challenging, but with Tinkercad, you can easily simulate and test sensors. In this
chapter, you’ll learn about different types of sensors, how they work and how to use Tinkercad to
simulate sensor circuits.

SENSOR

A sensor is a device that detects and responds to physical stimuli like light, heat, motion or sound.
Sensors convert these physical signals into data that can be processed by a microcontroller,
like the ones you use in Tinkercad. In robotics and electronics, sensors play a key role in helping
devices interact with their environment.

Types of Sensors

There are many types of sensors, each designed for a specific purpose. Let's explore some of the
common ones:
1. Photoresistor Sensor: A photoresistor is a sensor that changes its resistance based
on the amount of light falling on it. It is widely used in light-sensing applications like
adjusting the brightness of a screen or turning on a light when it gets dark.

2. Photodiode Sensor: A photodiode is a semiconductor device that generates
current when exposed to light. Unlike a photoresistor, it works in both direct
and reverse bias and is used in applications like optical communication, light
meters and more precise light sensing.

3. IR Sensor (Infrared Sensor): An IR sensor is used to detect objects, measure
distance or monitor the movement of people or animals. It works by emitting
infrared light and measuring the amount of light reflected back. It's commonly
used in proximity sensing, remote controls and line-following robots.

4. Ultrasonic Distance Sensor: The ultrasonic sensor uses sound
waves to measure distance by emitting high-frequency sound
waves and calculating the time it takes for them to bounce back.
This sensor is commonly used in robotics for obstacle detection
and distance measurement.

5. PIR Sensor (Passive Infrared Sensor): The PIR sensor detects infrared
radiation (heat) emitted by objects. It is primarily used to detect
motion, which makes it ideal for security systems, automatic lighting or
motion-triggered devices.

6. Soil Moisture Sensor: The soil moisture sensor measures the amount of moisture
present in the soil. It is a great tool for gardening, farming and smart irrigation
systems to automate watering based on soil moisture levels.

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