# Ultrasonic Smoothing Data

I am trying to smooth data from my ultrasonic sensor and have no idea how to!

Anyone have a smoothing function?

Thank you x

I've deleted your other cross-post @steve-unicorn.

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steve-unicorn:
I am trying to smooth data from my ultrasonic sensor and have no idea how to!

Anyone have a smoothing function?

Thank you

here’s a simple LPF algorithm.

``````// low-pass filter algorithm, given input samples, size of array and weighting factor
float lowpass(const float samples[], int size, float weighting){
float data[size], lpf=0;

data[0] = weighting*samples[0];

for (int i = 1; i<size; ++i){
data[i] = weighting*(samples[i]-data[i-1])+ data[i-1];
lpf+=data[i-1];
}

lpf+=data[size-1];

return lpf/size;
}
}
``````

hope that helps…

An += (Sn - An-1) * K

where An is the current average, Sn the current sample and K, a value < 1 which is the time constant for averaging.

I dont understand the LPF algorithm or how to connect this to my ultrasonic sensor data, please can you explain

steve-unicorn:
I dont understand the LPF algorithm or how to connect this to my ultrasonic sensor data, please can you explain