Light Dependent Resistor Electronic Circuits, page 1


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Light Dependent Resistor Circuits / Photocell Circuits, Page 1
Light Dependent Circuits: # - I J - Z
Last Updated on: Friday, August 29, 2008 02:33 PM

Circuits Designed by Dave Johnson, P.E. :

Dark Activated 12v Power Supply Switch
Using an inexpensive phototransistor, this circuit switches 12v to 24v power to a load, whenever the sun goes down. (added 7/06)

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

24-Bit ADC Measures from DC to Daylight: DN219 Design Notes (Linear Technology) (app note added 7/06)

8 Photo-Detector Circuit Board: (diagram added 05/07)

AN865: Sensing Light with a Programmable Gain Amplifier: Microchip Application Note Published 28-Mar-03 (app note added 2/06)

Circuit rejects ambient light: 06/10/99 EDN-Design Ideas / (added 2/06)

Color Sensor: Colour sensor is an interesting project for hobbyists. The circuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow and cyan (secondary colours); and black and white. The circuit is based on the fundamentals of optics and digital electronics. The object whose colour is required to be detected should be placed in front of the system. The light rays reflected from the object will fall on the three convex lenses which are fixed in front of the three LDRs. The convex lenses are used to converge light rays. (added 10/05)

Dark Activated Switch or Porch Light Switch: (electronic circuit added 4/05)

Dark activated Switch: (electronic circuit added 4/05)

Dark/Light Activated Relay: (schematic / circuit added 10/02)

Dark-activated 230V Lamp: Compact circuitry using small-size parts only. Can be wired in parallel to existing switches. (added 4/05)

Dark-activated LED or Lamp Flasher: Simple photo-sensitive circuit 3V battery supply (added 4/05)

Day and Night Infrared Detection: (circuit / schematic design added 6/06)

Day/Night/24 Hour Select Sensor: (circuit / schematic design added 6/06)

Digitally control room light intensity: 11/11/04 EDN Design Ideas / (added 1/06) Many people favor different light and temperature settings for different rooms depending upon their mood or whether they are working or relaxing. The circuit in Figure 1 controls the intensity of the artificial light in a room and monitors the temperature of two zones. The two main circuit blocks are the PIC16C67 master controller and the ADT7516 temperature-sensor interface, which includes a ...

Electronic night light: (electronic circuit added 05/07)

Feedback circuit enhances phototransistor's linear operation: 10/12/2006 EDN Design Ideas / (added 05/07) Bias-current compensation reduces ambient-light saturation effects.

Light Dependent Circuits: # - I J - Z