View Full Version : IR Sensor

01-11-2009, 09:55 PM
i need to make two different sensors(preferably IR but other methods will also do) to detect objects which are at a distance of about 40 cm and 20 cm respectively . the sensors ONLY NEED TO DETECT and light an led and DO NOT HAVE TO HELP IN NAVIGATION OR DISTANCE MEASUREMENT. how do i make such sensors . i need a simple design . urgent... please help !!