A few point to consider for this sketch.ġ. Every command of the following programme is explained in the comment section. Once we are done with circuit part, here is our programme to this circuit. As the light intensity changes LDR value changes thus the voltage drop on LDR will change and we are going to measure that voltage change.ģ.1 You may go with Robo India’s R-Board(UNO Compatible)-ģ.2 You may go with original Arduino UNO Board. +5 Voltage is applied to this arrangement. LDR is connected to a 10 Resistance in series. Some key points to understand about the circuit. Make following circuit with the help of above mentioned components. Required Hardwareįollowing Hardware will be required to perform this LDR circuit. It’s resistance decreases with the intensity of light. It is a variable resistor and changes its resistance in a proportion to the light exposed to it. This tutorial is made on Original Arduino UNO and Robo India’s R-Board(UNO compatible).Ī LDR (Light Dependent Resistor) or a photo resistor is a photo conductive sensor. ![]() Introduction:Ī step by step illustrated tutorial to use LDR on Arduino. ![]() An example is included in which a LED is controlled on the basis of LDR. This tutorial explains concept and how to use LDR (Light Dependent Resistor) with Arduino.
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