Pin	Name	Description
1	GND	Ground (It grounds the Input and complete the circuit path)
2	VCC	3.3 V to 5 V (Recommended Voltage)
3	OUT	Output (It goes low when obstacle is in range)
4	EN	Enable (It enables the circuit)as an activation sensor PIN (putting it in HIGH) and deactivating the sensor (putting it on LOW)

IMPORTANT:

This sensor allows you to activate and deactivate the obstacle detection by manipulating the enable-pin.
It is activated by default which means that the sensor is in detection mode by default.
If you don’t want that, you need to remove the jumper with the label “EN” and put a control signal on the enable pin.

CIRCUIT CONNECTION

An LED is attached to pin 13 of the Arduino Uno board to build a simple circuit of Obstacle Avoidance Sensor Module.
With the LED attached to pin 13, connect pin OUT of Obstacle Avoidance Sensor to D8 of the Arduino Uno board for displaying the Output. The Output pin goes LOW, when obstacle is within range due to reduced resistance of the photodiode (component in Obstacle Avoidance Sensor).
When the sensor detects an obstacle then the LED is turned ON automatically or else it stays off.
The EN (Enable) pin is used to enable the circuit. The Pin EN is an activation sensor PIN (putting it in HIGH) and deactivating the sensor (putting it on LOW), but the result will be the same. When reading, the input is always 1. But is not used in the given circuit connection.

CODE

Click to see the code: https://docs.google.com/document/d/e/2PACX-1vT7bfujCSt-KnHGZmlAeqLCPp5UKSLzraCknebYG35VehDUak4sbs7W4kVZOsoweoo1YaQZH749MOlp/pub?embedded=true

WORKING

This Arduino based Obstacle Avoidance Sensor mainly consists of an infrared-transmitter, an infrared-receiver and a potentiometer. In this particular sensor module, we identify the obstacle through the use of LED which is connected to Pin 13 of Arduino Uno board. Later, when the sensor detects an obstacle it turns ON the LED and further Output is being displayed on Serial Monitor.

Its working principle depends upon the reflecting character of an object. When the light emitted by the IR LED is incident on the photodiode after hitting an object, the resistance of the photodiode falls down from a huge value. One of the input of the op – amp is at threshold value set by the potentiometer. The other input to the op-amp is from the photodiode’s series resistor. When the incident radiation is more on the photodiode, the voltage drop across the series resistor will be high. In the IC, both the threshold voltage and the voltage across the series resistor are compared. If the voltage across the resistor series to photodiode is greater than that of the threshold voltage, the output of the IC Op – Amp is high. As the output of the IC is connected to an LED, it lightens up.

Battery operated	Yes , 1 nos 9V battery included

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