How far can IR cetec????????? - Electronic Circuits Projects Diagrams Free

Gundam82 · 2nd October 2004, 09:11 PM

HEy all.... i want to ask about the IR detector(LED and photodiode)...!!! how far can it be??? can be around 10cm????

If not.... wat should i do??? is that necessay i use the powerful detector like panasnic one?? erm...!!! i so blur now..~` hope someon :? e can help me

williB · 2nd October 2004, 10:08 PM

have you got a circuit in mind?
An IR emitter can work many meters..
try this ..
get a TV remote ..
set a port pin for input .
hook up detector output to port pin input ..( the detector should output a series of 0 to 5V pulses).
point remote at detector
if your pic has analog input even better..
hook up the detector output to analog input and see waveform of the remote ( they are all different )

Gundam82 · 3rd October 2004, 04:00 AM

ic.... but how about i don;t want too far... erm... got a certian distance.. like 15cm only..??... if that possible i set the distance for the IR pair??
act i got the detector already,.. its a panasonic branded .. from data sheet.. it shows that it only 3m max.. :roll:

Oznog · 3rd October 2004, 04:37 AM

Over longer range, you need to send pulses and detect the change in the receiver, otherwise ambient light will trigger it. Ambient light usually doesn't interfere with a short range thing because the signal strength at 1 cm is so much higher.

IR with a packet of pulses is used for laser tag & military game guns, those range at least 100s of feet.

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2nd October 2004, 09:11 PM	(permalink)
Gundam82	How far can IR cetec????????? HEy all.... i want to ask about the IR detector(LED and photodiode)...!!! how far can it be??? can be around 10cm???? If not.... wat should i do??? is that necessay i use the powerful detector like panasnic one?? erm...!!! i so blur now..~` hope someon :? e can help me

2nd October 2004, 10:08 PM	(permalink)
williB	have you got a circuit in mind? An IR emitter can work many meters.. try this .. get a TV remote .. set a port pin for input . hook up detector output to port pin input ..( the detector should output a series of 0 to 5V pulses). point remote at detector if your pic has analog input even better.. hook up the detector output to analog input and see waveform of the remote ( they are all different )

3rd October 2004, 04:00 AM	(permalink)
Gundam82	ic.... but how about i don;t want too far... erm... got a certian distance.. like 15cm only..??... if that possible i set the distance for the IR pair?? act i got the detector already,.. its a panasonic branded .. from data sheet.. it shows that it only 3m max.. :roll:

3rd October 2004, 04:37 AM	(permalink)
Oznog	Over longer range, you need to send pulses and detect the change in the receiver, otherwise ambient light will trigger it. Ambient light usually doesn't interfere with a short range thing because the signal strength at 1 cm is so much higher. IR with a packet of pulses is used for laser tag & military game guns, those range at least 100s of feet.