Instructables

Motion activated light switch flicker fix for CFL

Featured
If you've ever tried to add a motion activated light switch to a fixture with a CFL bulb you might have noticed that it flickers, unless you had the forethought to shell out 4 or 5 times as much for a dimmable  CFL.  

Typically the issue isn't with the motion detector or the CFL, but with the photoresistor light sensor bundled with the motion detector to keep the light off during the day.
 
Remove these adsRemove these ads by Signing Up

Step 1: What's being removed

Picture of What's being removed
DSC03290.JPG
Here's a close up of the photoresistor from my model.  The photoresistor always has to be someplace in the motion detecting window to allow it to receive light.  I cut the leads long in case I need to create a short across the photoresistor instead of an open.

Step 2: View of the circuit board on the back of the switch with the cover removed.

A picture of the back of the motion detecting switch.

To fix the flicker the photoresistor needs to be removed.  A photoresistor has a high resistance in the dark and a lower resistance the brighter it gets. Opening the junction will simulate complete darkness and always allow the light to turn on using the motion detector.

I didn't have a pair of cutters small enough to get to the sensor, so I used a pair of regular scissors.
decc19542 years ago
Thanks for this!!
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!