Maximizing Frequency Detection in Arduino Projects

[Genji Shimada]

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.

 

[jedishrfu]

To determine the frequency you'll need to find or develop an FFT algorithm which samples the data from the IR sensor, processes it and gets the frequency spectrum. It can be an intensive processing task and may tax your arduino system meaning other things may take longer to do.

https://forum.arduino.cc/index.php?topic=299461.0

http://www.arduinoos.com/2010/10/fast-fourier-transform-fft/

 

[Genji Shimada]

To determine the frequency you'll need to find or develop an FFT algorithm which samples the data from the IR sensor, processes it and gets the frequency spectrum. It can be an intensive processing task and may tax your arduino system meaning other things may take longer to do.

https://forum.arduino.cc/index.php?topic=299461.0

http://www.arduinoos.com/2010/10/fast-fourier-transform-fft/

Thank you!

 

[Martin_L]

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.