I've recently put together a project to monitor the IR pulses emitted by my smart meter.
Everything works great, except I'm having problems with ambient light. I'm using a Radio Shack IR photo transistor to fire an external interrupt on digital pin 2.
Right now I have some black vinyl floor runner material wrapped around the meter underneath the hose clamp that holds the bracket for the photo transistor. I had to put another piece on the front face today. My meter is on the south side of the house, and the face of the meter gets a good tan at noon.
I'm wondering if using a qrd1114 might be a better choice--not driving the emitter. The datasheet says it has a "daylight filter". Anyone have suggestions? It's a good thing my meter is wireless, if the electric company sees what I've done they would threaten to disconnect service. I was already planning on getting a qrd for my gas meter.
The black and decker energy monitor, and front probe mount of wattvision (http://www.wattvision.com/info/products
) do not have any of the shading I'm using.
Please do not suggest using analog! It maxes out as soon as I go outside, and the pulses are way to short to detect.
I would rather not have to put together a preamp/detector if I don't have to. I'm hoping I can fix this with a better photo-transistor.
This hacked up mounting threatens the long term viability of the project.