Maximizing Frequency Detection in Arduino Projects

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For an Arduino project involving an infrared LED and phototransistor, the main focus is on reading the frequency of the pulsating light to control different pins. To achieve this, implementing a Fast Fourier Transform (FFT) algorithm is suggested, which will sample data from the IR sensor and process it to obtain the frequency spectrum. However, this method can be computationally intensive and may slow down other processes on the Arduino. An alternative approach is to generate a square wave signal from the phototransistor using an amplifier or comparator. This allows for counting the pulse length of a single square pulse or the number of pulses over a specific time frame, utilizing interrupts and timers for accurate frequency measurement.
Genji Shimada
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Hello, I am doing an arduino project and I need a bit of help with a code. What I am doing is I am setting an Infrared led to pulsate at different frequencies and I use IR phototransistor to capture that light. Then the phototransistor sends the data back to the arduino and here I need to add some code to read the frequency and depending on it to set different pins HIGH. Any suggestions? I am using the arduino language by the way.
 
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You can simply count the frequency. For that, you must get a square wave signal from the transistor (either by an amplifier or comparator). Then you can count the pulse length of a single square pulse or count the number of pulses in a some time frame by using interrupts and timers, much like a frequency counter.
 
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