I need to calculate the distance of ir pair - Electronic Circuits Projects Diagrams Free

ariakovo · 25th December 2007, 05:19 PM

I have a IRED that have the following characteristics and i have a phototransistor that also have the following characteristics. I want to know how to calculate the distance between them from their characteristics.The manufacture is Perkin Elmer optoelectronics. Thanks.

image.GIF

**Nigel Goodwin** · 25th December 2007, 05:30 PM

What makes you think you can?.

ariakovo · 26th December 2007, 04:04 PM

What i have to do to calculate the distance.I want more characteristics?Or it isn't possible.Any idead?

**Nigel Goodwin** · 26th December 2007, 04:22 PM

I don't think it's possible, certainly not repeatably, or to any degree of accuracy - try it and see, I don't see as any calculations wil help you.

ariakovo · 26th December 2007, 04:43 PM

I want to achive 6 or 8 m distace but with only a ired and a phototransistor.Maybe and an amplifier for the phototransistor nothing else.Can i achive this distance with these components

**Nigel Goodwin** · 26th December 2007, 04:58 PM

You certainly require an amplifier, and considerable gain! - with LED and photo-transistor alone you're probably talking millimetres not metres.

But what EXACTLY are you trying to do?.

ariakovo · 26th December 2007, 05:18 PM

I am trying to do ir photo detectors.Photo sensors that detects objects if the beam cuts.For various applications like doors(if anyone pass the door then open the lights) etc.

**Nigel Goodwin** · 26th December 2007, 05:24 PM

For the large distances you're talking about, it's probably easiest to use IR receiver IC's, and modulate the transmitter at 38KHz. You also need to provide some sort of coding as well - the receiver won't work with just a carrier. Probably the easiest way is to use a small PIC at each end?.

Cry_Wolf · 26th December 2007, 05:28 PM

I think if you want to measure the distance accurately, you should use the ultrasound transmitter and reciever.

ariakovo · 26th December 2007, 05:38 PM

I don't have space and the cost of a PIC is to high for this application. I have use ir receivers modules but i had the problem that you say. I had to send some data so. I beleve that an ired , a phototransistor and an applifier.Or and ired that send a frequency in 30KHz a phototransistor a band pass filter and an applifier.What do oyu think?

**Nigel Goodwin** · 26th December 2007, 05:42 PM

Quote:

Originally Posted by ariakovo

I don't have space and the cost of a PIC is to high for this application. I have use ir receivers modules but i had the problem that you say. I had to send some data so. I beleve that an ired , a phototransistor and an applifier.Or and ired that send a frequency in 30KHz a phototransistor a band pass filter and an applifier.What do oyu think?

Well PIC's cost very little, and the PIC side would be cheaper than your amplifier/filter circuits.

However, if you would rather use seperate amplifiers and filters it's a perfectly valid old method.

ariakovo · 26th December 2007, 05:44 PM

I want only to know what is the distance that i can achilve between the emitter and the receiver. The distance that i can detect an object between. I don't want to mesure the distance with these components.Thanks

ariakovo · 26th December 2007, 05:46 PM

I understund. Thanks very mutch

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25th December 2007, 05:19 PM	(permalink)
ariakovo	I need to calculate the distance of ir pair I have a IRED that have the following characteristics and i have a phototransistor that also have the following characteristics. I want to know how to calculate the distance between them from their characteristics.The manufacture is Perkin Elmer optoelectronics. Thanks. image.GIF

25th December 2007, 05:30 PM	(permalink)
Nigel Goodwin	What makes you think you can?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

26th December 2007, 04:04 PM	(permalink)
ariakovo	What i have to do to calculate the distance.I want more characteristics?Or it isn't possible.Any idead?

26th December 2007, 04:22 PM	(permalink)
Nigel Goodwin	I don't think it's possible, certainly not repeatably, or to any degree of accuracy - try it and see, I don't see as any calculations wil help you. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

26th December 2007, 04:43 PM	(permalink)
ariakovo	I want to achive 6 or 8 m distace but with only a ired and a phototransistor.Maybe and an amplifier for the phototransistor nothing else.Can i achive this distance with these components

26th December 2007, 04:58 PM	(permalink)
Nigel Goodwin	You certainly require an amplifier, and considerable gain! - with LED and photo-transistor alone you're probably talking millimetres not metres. But what EXACTLY are you trying to do?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

26th December 2007, 05:18 PM	(permalink)
ariakovo	I am trying to do ir photo detectors.Photo sensors that detects objects if the beam cuts.For various applications like doors(if anyone pass the door then open the lights) etc.

26th December 2007, 05:24 PM	(permalink)
Nigel Goodwin	For the large distances you're talking about, it's probably easiest to use IR receiver IC's, and modulate the transmitter at 38KHz. You also need to provide some sort of coding as well - the receiver won't work with just a carrier. Probably the easiest way is to use a small PIC at each end?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

26th December 2007, 05:28 PM	(permalink)
Cry_Wolf	I think if you want to measure the distance accurately, you should use the ultrasound transmitter and reciever. __________________ Khizer Naeem Mughal IIUI

26th December 2007, 05:38 PM	(permalink)
ariakovo	I don't have space and the cost of a PIC is to high for this application. I have use ir receivers modules but i had the problem that you say. I had to send some data so. I beleve that an ired , a phototransistor and an applifier.Or and ired that send a frequency in 30KHz a phototransistor a band pass filter and an applifier.What do oyu think?

26th December 2007, 05:44 PM	(permalink)
ariakovo	I want only to know what is the distance that i can achilve between the emitter and the receiver. The distance that i can detect an object between. I don't want to mesure the distance with these components.Thanks

26th December 2007, 05:46 PM	(permalink)
ariakovo	I understund. Thanks very mutch