Adafruit Photo cell (CdS photoresistor)

AdafruitSKU: K479
No reviews

Price:
Sale price$2.00
Automatic 10% Discount Available
Create an account and Sign Up for our Newsletter to get Adafruit Member Pricing and Save 10% on Adafruit Products like this!
Stock:
In stock (12 units), ready to be shipped
Buy On Amazon

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!

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


Estimate shipping

You may also like

Recently viewed