Quick Tip: If you need to check the batteries on your remote control, you can do it easily with a smar phone camera.
Many households have 5 or 6 remote controls lying around the house. Sometimes, they stop working and you don’t know what happened.
Most remote controls use infrared light to transmit the signal. The human eye cannot see this light, however a camera can.
Simply open your smartphone camera and point it at the business end of the remote control. Press a few buttons on the remote and you should see a light emitting from the remote control.
If you fail to see a light emitting from the remote, then swap the batteries and repeat the test.
Human eyes can’t see infra-red colour, but our phone cameras can.