I was thinking of a project for home automation with few IR sensors on my stairs that detect when someone pass through and turn some LED on. I would like to build it myself so i didn't want to use one of those sharp or ultrasonic sensor.
After playing with few IR sensor, i realize how difficult it is to calibrate the analog one. When the sun pass through the windows, they become completely blind! I should probably try electronical and paper filters.
Then i made a test with a digital IR sensor TSOP38238 and i have a perfect detection of my remote control signal even with the sun on the sensor...
I need around 60 to 70 cm detection, should i work on analog IR with several filter or digital IR with a signal? I have to precise that i don't need any distance measure, just someone pass or not...
Thanks a lot, if you have other ideas or any question, don't hesitate :)