Light Dependent Resistor LDR 5MM Photoresistor – KSH 30 at HIMASTORES Mombasa – best electronics in Kenya
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Light Dependent Resistor LDR 5MM Photoresistor

SKU: HMJ161 Category: Capacitors and resistors
KSH 30.00
In Stock

Product Description

Light Dependent Resistor LDR 5mm Photoresistor

Analog Light Sensor for Ambient Light Detection Projects

The 5mm LDR is a lightdependent resistor that changes its resistance based on the intensity of light falling on its surface. It is a fundamental, lowcost analog sensor, making it a popular choice for applications like automatic lighting control, nightlights, and security systems [citation:6][citation:8].

Analog Light Sensing - Resistance varies with light intensity: decreases in bright light and increases in darkness [citation:6][citation:8].
Simple TwoTerminal Device Polarization-free; can be connected in any direction, simplifying circuit design [citation:8].
Common applications include automatic streetlights, camera exposure control, and nightlights [citation:6][citation:7].
For best results with microcontrollers, use the LDR in a voltage divider circuit with a fixed resistor, and read the analog voltage [citation:4].

Technical Specifications (Typical)

ParameterValue
Head Diameter5mm
Maximum Voltage150V DC
Maximum Power100mW
Operating Temperature-30°C to +70°C
Spectral Peak540nm
Response Time20ms (Rise), 30ms (Down)
Light Resistance (10 Lux)~2kΩ to 200kΩ (varies by model)
Dark Resistance~0.5MΩ to 200MΩ (varies by model)

Note: Light and dark resistance values vary significantly depending on the specific model [citation:1][citation:2][citation:3].

Key Features

+Ambient Light Detection - Simple resistance change correlates to light level

+No Polarity Easy to connect in any direction for hasslefree prototyping

+Low Cost and Widely Available An affordable and standard component for lightsensing applications

= Common Applications =

  1. Automatic night lights and streetlight controls [citation:6][citation:7]
  2. Camera exposure control and automatic brightness adjustment [citation:6]
  3. Presence/Absence detection (beam breaker systems) [citation:6][citation:7]
  4. Light-sensitive alarms and smoke detectors [citation:6][citation:13]
  5. Solar-powered lighting systems [citation:6]
Versatile and Reliable - A staple component for basic light detection in electronics projects.
Arduino Compatible - Easily interfaces with analog inputs using a voltage divider [citation:4].

√ Widely available in packs of 10, 20, or more

√ Through-hole design for breadboard and PCB use