LDR Light Sensor Module 4-Pin Photoresistor (KY-018)
Prices updated: 13 Oct 2026
Compare prices
| Store | product | Price | View in store |
|---|---|---|---|
 RAM Electronics | LDR Module 4pin Photoresistor (SKU#KY018) | 35 EGP | View in store |
Price history
Lowest daily price, last 90 days
Lowest price recorded: 35 EGP
About this product
A light sensor module built around a light-dependent resistor (LDR, photoresistor). Its resistance falls as light increases, so the module outputs a voltage that changes with ambient brightness. Used for light-level detection in night lights, automatic lighting and Arduino or ESP32 projects.
Specifications
- Sensor type
- LDR (photoresistor)
- Output
- Analog voltage
- Number of pins
- 4 (as listed)
- Module code
- KY-018
Frequently asked questions
What is the price of LDR Light Sensor Module 4-Pin Photoresistor (KY-018) in Egypt?
LDR Light Sensor Module 4-Pin Photoresistor (KY-018) currently costs 35 EGP in Egypt.
Where can I buy LDR Light Sensor Module 4-Pin Photoresistor (KY-018) in Egypt?
LDR Light Sensor Module 4-Pin Photoresistor (KY-018) is available from RAM Electronics. Compare the offers above to find the best price.
How do I connect it to an Arduino or ESP32?
Connect the power pins to the supply and ground as labeled on the board, and connect the signal pin to an analog input such as A0 on Arduino. Read the value with analogRead(). On ESP32, use an ADC-capable pin and keep the input within 3.3 V.
Does it measure light in lux?
No. The module gives a relative brightness reading through a change in voltage and is not calibrated to lux. It works well for threshold detection, such as switching a light on at dusk.
