Smoothing analog sensor values

If the sensor value on your analog pin has some unwanted amplitudes, you can smooth it with some tricks.

smoothing analog sensor values #1

Tremors can come from fluctuating power supply, interference or a circuit inside the Arduino chip.

In this example, we simply take a portion of the new measurement and combine it with a portion of the value measured last time. The part of the old value is always a bit bigger than the new value and so the new value influences the measurement but we overwrite the tremor.

>> https://www.youtube.com/watch?v=AsQ4G1lckhY

int sensorValue;

void setup(){
Serial.begin(9600);
}

void loop(){
sensorValue = analogRead(A0);
smoothValue = 0.6 * smoothValue + 0.4 * sensorValue; //you can tray with the values you multiply. It is just always under 1
Serial.print(sensorValue);
Serial.print("\t"); //TAB
Serial.print(smoothValue);
}

smoothing analog sensor values #2: running average

To smooth your sensor value, a simple line of code you can add to calculate the running average is: averageSensorValue = (averageSensorValue * (average-1) + currentSensorValue) / average;

>> https://www.kobakant.at/DIY/?p=7968