Compare prices
| Store | product | Price | View in store |
|---|---|---|---|
 Microohm | Photo Resistor Sensor LDR 7mm | 12 EGP15 | View in store |
Price history
Lowest daily price, last 90 days
Lowest price recorded: 12 EGP
About this product
GM5539 7 mm light-dependent resistor (LDR), whose resistance drops as light intensity increases, with a spectral peak at 540 nm. It is used for ambient light sensing and light-level detection with Arduino and similar boards, usually in a voltage divider with a fixed resistor.
Specifications
- Model
- GM5539
- Size
- 7 mm
- Maximum voltage
- 150 V DC
- Maximum power
- 100 mW
- Spectral peak
- 540 nm
- Light resistance (10 Lux)
- 50-100 kΩ
- Operating temperature
- -30 ~ 70 °C
Frequently asked questions
What is the price of GM5539 LDR Photoresistor 7 mm in Egypt?
GM5539 LDR Photoresistor 7 mm currently costs 12 EGP in Egypt.
Where can I buy GM5539 LDR Photoresistor 7 mm in Egypt?
GM5539 LDR Photoresistor 7 mm is available from Microohm. Compare the offers above to find the best price.
How do I read an LDR with Arduino?
Build a voltage divider: connect the LDR between 5 V and an analogue pin, and a fixed resistor (for example 10 kΩ) between that pin and ground. Then read the value with analogRead(). Brighter light lowers the LDR resistance and changes the reading.
Is an LDR fast enough to detect quick light changes?
No. LDRs respond relatively slowly, typically in milliseconds to seconds, so they suit ambient light levels rather than fast pulses or high-speed signals.
