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IR distance sensor? Answered

hi,

im looking for a way to detect distance (around 4 feets) using IR.
basically a person will carry the IR transmitter and walk around until he comes across an IR receiver. the receiver is connected to a buzzer  where the buzzer will emit louder sound as the user getting near to the receiver. 
can this be done by using ir transmitter and receiver led?
any other better suggestion is welcome

thank you for your reply 

Discussions

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steveastrouk

5 years ago

It'll sort of work, but LEDs emit a cone of light, not a sphere. How will you point it ? Alternatively, a filament lamp, set to barely light might work ?

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bhan1992steveastrouk

Answer 5 years ago

i will use a branch of IR transmitter together so that it produces enough IR light.
its ok for me that leds emit cone of light.
i just want to know which kind of IR sensor that has its output signal varies according to the intensity of the IR light it sensed.

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steveastroukbhan1992

Answer 5 years ago

Any IR photodiode's output is proportional to light intensity.

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mpilchfamilysteveastrouk

Answer 5 years ago

How is a single IR LED and a single receiver suppose to be used to determine distance so the micro controller can make the sound loader as the person gets closer?

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steveastroukmpilchfamily

Answer 5 years ago

Intensity will be somewhat proportional to distance, by inverse square law.

....-ish.....

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rickharris

5 years ago

A microprocessor project indeed.

http://www.techsupplies.co.uk/epages/Store.sf/en_GB/?ObjectPath=/Shops/Store.TechSupplies/Products/LED020

as an example.