LDR Photoresistor 5mm (CdS Light-Dependent Resistor)
Prices updated: 13 Oct 2026
Compare prices
| Store | product | Price | View in store |
|---|---|---|---|
 Most ElectronicsCheapest | 5mm LDR Light Dependent Resistor Photoresistor | 4.5 EGP5 | View in store |
 UGE | LDR Photoresistor 5mm | 11.4 EGP | View in store |
Price history
Lowest daily price, last 90 days
Lowest price recorded: 4.5 EGP
About this product
A 5 mm CdS photoresistor (LDR) whose resistance falls as light intensity rises, so it can detect light or darkness in simple sensing circuits. It is commonly used in automatic lighting, night-light and light-level detection projects with a microcontroller.
Specifications
- Sensor type
- CdS photoresistor (LDR)
- Diameter
- 5 mm
- Resistance behaviour
- Decreases as light increases
- Sensing
- Light / darkness
Frequently asked questions
What is the price of LDR Photoresistor 5mm (CdS Light-Dependent Resistor) in Egypt?
LDR Photoresistor 5mm (CdS Light-Dependent Resistor) currently costs between 4.5 and 11.4 EGP across 2 offers in Egypt.
Where can I buy LDR Photoresistor 5mm (CdS Light-Dependent Resistor) in Egypt?
LDR Photoresistor 5mm (CdS Light-Dependent Resistor) is available from Most Electronics and UGE. Compare the offers above to find the best price.
How do I read an LDR with an Arduino?
Build a voltage divider with a fixed resistor (commonly 10 kΩ) between 5V and GND, with the junction connected to an analog pin. Reading that pin with analogRead() gives a value that rises or falls with light level.
Can it measure exact light levels?
Not precisely. Its response is non-linear, varies between units and is slow, so it is best for detecting light versus darkness rather than measuring lux accurately.
