The whole circuit is powered by a 5V mobile charger through the micro USB port of the Raspberry pi. However if desired a resistor of value 470 ohms can be added between the ground pin of LEDs and Raspberry Pi. Since the GPIO pins of Raspberry Pi are 3.3V, a current limiting resistor is not mandatory. These two LEDs are connected to GPIO3 and GPIO2 respectively. We have also used two LED (Green and Red) to indicate the status of the object. The output pin of the IR module is connected to the GPIO14. We have directly powered the IR module from the 5V and Ground Pin of Raspberry Pi. As you can see the circuit diagram is very simple. The circuit diagram for connecting Raspberry Pi with IR sensor is shown below.

The potentiometer on top of the module can be used to adjust the range of the IR sensor. The module is powered by the 5V pin from Raspberry Pi and the out pin is connected to GPIO14 of Raspberry Pi. Like all IR sensor it has three pins which are 5V, Gnd and Out respectively. The IR Sensor used in this project is shown above. You can learn more about IR Sensor Module Circuit here. This IR ray will be received back by the receiver (Photodiode) and the output will be made high after amplified using an op-amp link LM358. This is made possible by using a pair of IR pair (transmitter and receiver), the transmitter (IR LED) will emit an IR ray which will get reflected if there is a object present before it. If the object is present it give 3.3V as output and if it is not present it gives 0 volt. IR sensors (Infrared sensor) are modules which detect the presence of objects before them. This circuit can also serve as Security Alarm Circuit. In this project, when there is no object in front of IR sensor then the Red LED remains turned on and soon as we put something in front of IR sensor then red LED turns off and Green LED turn on. So lets learn how to interface this sensor with Raspberry Pi. Simply putting, it can detect the presence of objects before it and also differentiate between white and black colour. These sensors are most commonly use in small robots like line follower robot, Edge avoiding robot etc.

In this tutorial we will learn how we can Interface an IR sensor with Raspberry pi. Raspberry Pi is also a boon for IoT projects, as it is a pocket sized computer with inbuilt Wi-Fi, having capabilities of a microcontroller.

We have covered lot of Raspberry Pi Projects with many sensors. There are many sensors which can detect certain parameters from the real time world and transfer it to a digital world. All this can be possible only if we know how to make it interact with the real world. With its high computational power it can work out wonders in hands of electronics hobbyists or students. As we all know Raspberry Pi is a wonderful Developing platform based on ARM microprocessor.

Fritzing connect arduino raspberry pi