LDR 3mm Small Size Photoresistor (CdS)
Prices updated: 13 Oct 2026
Compare prices
| Store | product | Price | View in store |
|---|---|---|---|
 RAM Electronics | LDR Small Size 3mm Photoresistor (CDS) | 5 EGP | View in store |
Price history
Lowest daily price, last 90 days
Lowest price recorded: 5 EGP
About this product
A 3 mm CdS light-dependent resistor (LDR) whose resistance falls as the light intensity on it increases. It is used in light-sensing projects such as automatic night lamps and ambient light detection, usually read through a voltage divider and an ADC pin. Its response is relatively slow, so it suits ambient light rather than fast signals.
Specifications
- Type
- CdS photoresistor (LDR)
- Diameter
- 3 mm
- Operating principle
- Resistance decreases as light increases
Frequently asked questions
What is the price of LDR 3mm Small Size Photoresistor (CdS) in Egypt?
LDR 3mm Small Size Photoresistor (CdS) currently costs 5 EGP in Egypt.
Where can I buy LDR 3mm Small Size Photoresistor (CdS) in Egypt?
LDR 3mm Small Size Photoresistor (CdS) is available from RAM Electronics. Compare the offers above to find the best price.
How do I read it with an Arduino?
Build a voltage divider: the LDR from 5 V to the analog pin, and a fixed resistor (for example 10 kΩ) from that pin to GND. Read the pin with analogRead(). The fixed resistor value sets the sensitivity range.
Can it give exact light measurements?
No. Its response is non-linear and varies between units, so use it for relative light detection and calibrate thresholds for your own setup.
