View Full Version : object detector... urgent help

01-16-2009, 11:04 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... would help if u can start with the basics. please help !!

01-20-2009, 06:06 AM
Since you distance are quite big IR may cause problems. IR sensors using TSOP module have been able to detect objects about 20-25cm but this requires a very carefull design.

So ur best bet lies in ultrasonic sensors. They are quite difficult to setup , but once done correctly can easily detect the distance of uptp 1m, try a google search.

01-21-2009, 08:52 PM
k. wat if i need a smaller range. say 5 cm . google throws up results for only ir sensors with navigation . i need detection only

01-22-2009, 10:48 AM

01-22-2009, 07:48 PM
thanks man... appreciate it

01-29-2009, 09:19 PM
the link doesn't explain the low range model well... is there any better place to check it out

02-17-2009, 04:09 PM
for more details visit