The LDR Light Depend Sensor Module is a 4-pin light detection breakout built around a CdS photoresistor, providing both analog (AO) and digital (DO) outputs and operating from 3.3V to 5V DC across a wide -30°C to 70°C temperature range. The ldr sensor module works on the principle that the cadmium sulphide photoresistor’s resistance decreases as ambient light intensity increases — bright light gives low resistance, darkness gives high resistance, and this variable resistance forms a voltage divider with the onboard 10K ohm potentiometer to produce both outputs.
The ldr sensor arduino analog output (AO) gives a continuous voltage proportional to light level, suitable for analogRead() based light-level logging, while the digital output (DO) switches HIGH or LOW based on a threshold set by the onboard 10K potentiometer — turning the potentiometer adjusts the light level at which the digital output triggers. The ldr light dependent resistor digital threshold mode is commonly used for automatic street light and dark-activated relay circuits, while the analog mode suits light intensity measurement and data logging projects. This ldr made in india module is manufactured domestically, offering Indian college labs and STEM projects a locally supported light sensor alternative.
CdS photoresistors have a slow response time compared to photodiodes or phototransistors — light level changes take tens to hundreds of milliseconds to fully register, making this light dependent sensor module unsuitable for high-speed light-based communication but well-suited for ambient light sensing. Available from StemVolt, this module is ideal for engineers building light-activated automation systems and practical embedded ambient sensing electronics projects.
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Features:
- CdS photoresistor resistance decreases with increasing ambient light intensity
- Dual analog and digital outputs for light level and threshold sensing
- Onboard 10K potentiometer adjusts digital trigger light threshold level
- Made in India domestic manufacturing for Indian STEM lab builds
- -30°C to 70°C wide range suits indoor and outdoor deployment
Technical specifications:
 Applications:
- LDR Sensor Module used for Arduino automatic street light project
- College project uses ldr sensor module for light level data logger
- Smart home uses ldr sensor arduino for dark-activated relay switch
- Solar tracker uses ldr light dependent resistor for sun position sensing
- STEM kit uses ldr made in india for beginner light sensor demo
Package includes:
- 1 x LDR Light Depend Sensor Module
Aarav Sharma –
Genuine quality product
Abhay Singh –
Quick response support helped with project queries, and the sensor performed accurately for light-dependent switching and educational experiments.
Priya Patel –
Best deal available
Arjun Reddy –
Delivery was tracked and the module arrived safely with bubble wrap packing, ensuring all components were in perfect condition
Vikram Rajput –
LDR Module provides reliable light intensity detection and is ideal for school projects, automatic lighting systems, and arduino-based applications