8051 microcontroller ir sensor based object detection

8051 microcontroller ir sensor based object detection

Radar’s are used on airports as well as military bases for unauthorized object detection. Radars work on the principal of echo detection in order to detect objects. In air the refection of echo waves is measured on the basis of time taken to receive the signal. Based on this data the object distance is identified. We propose to simulate this concept using Infrared technology. Our system consists of a IR sensor radar that rotates constantly at 360 degrees. The radar constantly emits IR rays and measures reflection. On detecting reflection from any object within its range the radar stops and sends a signal. The radar also sends the angle at which the object was identified. We here use a small IR transmitter receiver pair. The pair is interfaced with microcontroller to control the circuit working. The microcontroller constantly receives the radar input. On sensing an object the radar sends an alert message to the microcontroller. The microcontroller now gets the data and also gets the radar direction in order to get angle at which object was detected.

The IR Object Detection sensor module is quiet easy to make. This sensor circuit below is a low cost - low range infrared object detection module that you can easily make at home using IR LED's. The Maximum input Voltage is 5 Volts.

We will use a photodiode and IR LED to make a simple circuit. IR led looks like a regular LED that you usually see in Television Remote controls.

For now I have added a regular LED to glow as in indicator when something is detected, you can replace it with a buzzer or something else the way you wish.

The Main concept is simple, the IR led keeps transmitting IR infrared rays up to some range (there is a potentiometer also in the design with the help of which you can alter the range). When some object comes in the (IR) infrared range, the IR waves hits the object and comes back at some angle, The Photo diode next to IR led detects that IR infrared rays which got reflected from the object and hence works as a proximity sensor. You can read more details about Proximity sensors for more.