Quote:
Originally Posted by jayerose
One sensor has a red light; the other is not lit...should it be green?
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If your problem is a misalignment of the sensors, usually resulting from one being "bumped", buy a cheap laser pointer. Set it on top of the sending sensor, tape it in place if necessary, and use the laser beam while bending the brackets to bring the infrared beam in line with the receiving sensor.
If your problem is sunshine falling on the receiving sensor, the best solution is to glue a short length of PVC pipe on that sensor. I found that a 2" length of PVC was enough. You may have to realign the sending sensor so that the infrared beam hits the small opening of the PVC.