help with InfraRed link

[naga5]

hello guys,
i am working on a visitor counter using microcontroller,
i am done with the code and tested it in proteus,
but i got a problem with the ir link,,
here i hav to establish a link such that any person passing through the door will obstruct the link and i am going to have a trigger,
i am trying photodiodes and IR leds,
but i can't get any ????????

plz help

 

[ckshivaram]

you can use an IR transmitter and receiver led type... availability should not be a problem.. use comparator circuit with receiver...

 

[naga5]

thanx for replying,,
i used these diodes (

)and an op-amp current to voltage converter circuit,,
but i am not sure of the orientation of those two diodes?????

 

[DineshSL]

Hi,

check this schematic for hardware,
Nigel's PIC Tutorial Infrared Board

Relevant program for PIC in MPLAB assembly
PIC Tutorial  Five - Infrared Communication

 

[ctownsend]

i am working on a visitor counter using microcontroller,
i am done with the code

which microcontroller? how is the code written, assembly or C? Where's the schematic? Where is the code?

plz help

you are NOT not going to get any help without posting a schematic diagram of what you did along with your code

 

[naga5]

hi,, sorry i m a bit offline these days,,
i m uploading the schematic's here,,



here two diodes should be used,, i had two diodes just as i uploaded in previous post,,
but i can't get any output at the receiver,, i dont know why because i can't see IR,,
what should i do to get output,,,

 

[ckshivaram]

Is the transmitter working properly.. check with some mobile camera.. when you power ON the transmitter LED , and when you see IR transmitter through camera it should illuminate and you should see light. if not either the polarity of transmitter is reverse or else transmitter LED is not working....

 

[Senthilkumar_rjpm]

Is the transmitter working properly.. check with some mobile camera.. when you power ON the transmitter LED , and when you see IR transmitter through camera it should illuminate and you should see light. if not either the polarity of transmitter is reverse or else transmitter LED is not working....

its a intreating & valid point to me... Thanks Mr.ckshivaram....

 

[naga5]

yes sir,,
i checked it, it works fine, and for receiving purpose i am using this ckt,,

but here i am not getting any output,,