Photo cell (CdS photoresistor)

(1 Reviews)
Price:
Sale price £0.80
incl. VAT
excl. VAT
Stock:
In stock
Quantity:

Description

CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about ~1KΩ, when dark it goes up to ~10KΩ.

To use, connect one side of the photo cell (either one, its symmetric) to power (for example 5V) and the other side to your microcontroller's analog input pin. Then connect a 10K pull-down resistor from that analog pin to ground. The voltage on the pin will be 2.5V or higher when its light out and near ground when its dark.

CdS photocells are not RoHS compliant, so if you need something equivalent but RoHS compiant, check out the photo transistor.

For a full tutorial with wiring diagrams, code examples and project ideas, please read the photocell tutorial page!

Technical Details

Dimensions:

  • Length: 4.46mm/0.18in
  • Width: 5mm/0.20in
  • Height: 2.09mm/0.08in
  • Weight: 0.25g/0.01oz

Revision History:

  • As of Dec 15, 2019 the resistance range has changed to 1K-10K

Payment & Accreditations

Payment methods
Amazon American Express Maestro Mastercard PayPal Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Accreditations