Did you know you can catch a thief using an IR sensor? But wait, what’s IR sensor?
What is IR sensor?
IR stands for Infrared rays. These rays are the source of energy in the form of light invisible to human eyes. IR rays are a type of electromagnetic radiation and their wavelength lies between 700 nm to 100,000 nm.
Infrared sensor or IR sensor is an electronic circuit that works on the principle of Infrared light emission and reflection to detect an object, distance and motion.
Let’s do an experiment.
Things you need:
You will need the following of the Havi Elements.
- Power Element
- IR Element
- Buzzer Element
Accessories required
- Power bank with USB cable
You can get these elements and accessories from these robotic kits.
Prepare the circuit as shown here.
The experiment
STEP 1: Connect the Power element, IR element, and buzzer element. (IR element has a transmitter, receiver, and control portion, combined together it makes IR sensor)
STEP 2: Tune potentiometer of IR element(which is basically infrared sensor) so the mark on the nob remains in the center.
STEP 3: Switch on the power element. As soon as the energy reaches the IR element, it will release the infrared rays.
STEP 4: Place an object in the path of infrared rays and the buzzer will start making the sound.
Working principle of an IR sensor
What objects can IR sensor detect?
Any object that reflects the light will activate the IR sensor and make it pass the “YES” signal. But what about the transparent objects like
- Glass
- Water
- Plastic
- Colored water
All these objects may or may not reflect the IR light. Actually, it depends on the quality or say transparency of the objects.
Say a glass, if very pure and let’s pass all of the IR light, will not get detected by the IR signals. Try various transparent, semi-transparent and non-transparent glasses around you.
You can try pouring some water in front of the IR element, like creating an artificial waterfall, and see how IR sensor reacts.
Can only an IR transmitter send the IR light?
To answer that, check your element circuit into the sunlight without blocking the way of the IR LED. What happens? The buzzer will make the sound. That means it has received the “YES” from IR even though you didn’t block it?
So from where the receiver has received the IR light? Huh?
Sun – The source of infrared rays
This sun. The sun radiates IR light and is the biggest source of energy for us.
The same is true for fire and high-intensity bulbs and lights. They do emit IR light which the IR receiver detects and passes the “YES” even though there is no object to block the way.
Even your TV and AC remote controls also use IR light. Try to point the remote control against the IR LED and press the buttons, it should send a “YES” signal and buzzer will make the sound.
Still, need to explain this? You smart heroes!
Place the IR near to the door or locker in a way so a body part blocks the IR light flow… and…. Dhen…ten….nen…….
Pro tip: You can toggle the IR sensor output using Flip element and with that you can make a theft prevention system too!
Uses of infrared sensor
Infrared is used in diverse sectors in ample ways. The primary uses include tracking, surveillance, night vision, and target location. IR sensor is widely used in the Civil, military, space, and medical domains.
And with this, now it’s your time to create amazing IR sensor projects and helpful inventions.
Check: 13 IR sensor based STEAM projects
Heroes you go!
