IR Detecter

LC Reloaded

I'm trying to build an IR Detector circuit. What I want to do is have a IR transistor set to detect a certain frequency that is emitted from an IR LED. I'm just trying to get a high or low output if the frequency is detected sent to the basic stamp.

I'd like for it only to detect 4kHz give or take a few %.

Any help please.

Franklin

Read up on bandpass filter circuits as that is what you are trying to build

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- Stephen

LoopyByteloose

Probably, you will want to use OP amps to create your bandpass filter. Filters can either include amplifiers [noparse][[/noparse]considered 'active' filters] or just use coils, resistors, and capacitors [noparse][[/noparse]considered 'passive' filters].

With the limited amount of power that comes out of an IR LED, you need to have the amplification in order to produce any useful information. An OP amp generally can amplify 1000x nicely, but can be adjusted to less.

So, you would try to get a 0 to 5 volt output at 4kHz. You could put it through a Schmitt Trigger to square the wave form. That should then be ready for a BasicStamp.

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···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan