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Read Article βLDR (Light Dependent Resistor) is a resistor whose resistance varies inversely with the amount of light falling on it. It is also known as a photoresistor, photocell, photoconductive cell, etc. LDR are available in 5mm, 8mm, 12mm, and 25mm dimensions. Chose larger dimension sensors when you want to have a large sensing area, faster response and quick sensing. Use small dimension sensors when you have space contrainsts in your application.
LDR is made of high-resistance semiconductor material. The semiconductor material used for the photo resistors is cadmium sulfide, CDs. When itβs dark, LDR has high resistance known as dark resistance. Usually, dark resistance will be in the range of mega ohms. When light falls on LDR, resistance reduces to a kilo ohms range.
Working principle: when light falls on LDR i.e. when photons fall on LDR, valence band electrons get sufficient energy to get excited to the conduction band. Incident photons must have energy more significant than the forbidden energy gap of the semiconductor. When light having enough energy falls on the device, more electrons will get excited to the conduction band. As the number of free electrons increases, more current flows through the circuit. Hence it is said that resistance decreases as light falls on LDR.
LDRs can be directly connected to an ADC of a microcontroller (Arduino, Raspbery Pi, etc) through a resistor divider circuit. They can also be used without a microcontroller using a simple opamp/comparator circuits. LDRs are the cheapest and easiest way to detect light. They dont give accurate results in lux but are the best option to detect day/night, etc
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
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