Test IR Sensor with Arduino
https://www.youtube.com/watch?v=bt4-HIver1A&list=UU7VRGdpNacW2E4QQt0INKUg

Test DIY humidity sensor with copper tape.
https://www.youtube.com/watch?v=-EcFEvAVBtg&list=UU7VRGdpNacW2E4QQt0INKUg