IR Project - noisy module

[dxpwny]

I've worked with IR projects for years. My last one, about 8 years ago, used an Atmel AT89S8252. I just started another one - using a Dallas 89C450.

Anyways, my troubles now are not micro-controller related - but IR related. I just wired up my project and the IR output of my IR module, a Sharp GP1U52x, is quite noisy. I tried a few modules, all are very noisy.

Smelling a rat ... I started to turn off lights. Thought maybe it was my compact flouresants. No ... it was my 28 inch Viewsonic monitor. With it off, everything is well, and my IR module is quite .. only responds to IR from my remotes.

With the monitor ON ... and the light from the monitor visible by the module, its very noisy on the output. I put some papers in between the two and it quiets down.

I use red plastic ... the type of plastic you might see covering the LED display of a digital clock, to cover the IR modules - I had thought they provided some simple light filtering.

I've tried all sort of caps on the IR module power input ... nothing seems to quite it down.

Anyone have suggestions on how I can work on my IR project - and still use my 28 inch monitor to develop the code ?

 

[jpanhalt]

That module is a very old design. I suggest you try a newer integrated design, such as one of the TSOP versions from Vishay (https://www.vishay.com/ir-receiver-modules/show-all/ )

That may not solve all of your problems with stray IR, but I have used the Vishay modules in bright sunlight and indoors with fluorescent lights without problems. I have not used them with the specific monitor you describe.

John