LDR Light Sensor Board (4 Pin)

LDR Light Sensor Board (4 Pin)

LDR comes from the abbreviation of the phrase ‘Light Dependent Resistor’ and means a resistor dependent on light. LDR is also called a photoresistor. In addition to being a type of resistor, LDR is also a passive sensor and its structure changes depending on light intensity.

To use the LDR sensor under normal conditions, we need to build a circuit on a breadboard as shown in the image below.

The LDR Light Sensor Board allows us to connect our LDR sensor directly to devices such as Arduino® without the need to build an external circuit.

The LDR light sensor board also provides both analog and digital outputs. You can make measurements by connecting the analog output pin directly to one of the analog pins of the UNO development board. There is also a digital output pin on the board. When the detected amount of light exceeds the threshold value, it gives a HIGH output; when it remains below the threshold value, it gives a LOW output. The threshold value required for digital output is adjusted with the trimpot on the board.

Technical Specifications:

• Operating Voltage: 3.3-5 V
• Output Type: Analog and Digital

Documents / Useful Links:

• What is an LDR? Working Principle of Photoresistors