Averaging input from multiple input over a fixed amount of time (estimated)

Question

I am trying to average input values for a number of inputs and have it then store those averages into a string to write to a txt doc on a sd card.

I am using:

// read 6 sensors and append to the string:
for (int analogPin = 0; analogPin < 6; analogPin++) {
  int sensor = analogRead(analogPin);
  dataString += String(sensor);
  if (analogPin < 6) {
    dataString += ",";
  }
}

to read the pins at the moment, but I want to change the analogRead(analogPin) to an average value and then use the averages to create the string.

but when I try to average the data I run into errors, or I get output that is 0 for something that should be higher (3.3V).

I am doing this to stabilize my values a bit better and remove jitter.

Any suggestions?

Answer 1

This function will average readings on an analog pin, include it and use it in place of analogRead(...) and it should do what you want.

int aveAnalogRead(int pin, int ave=10, int delayms = 0)
{
    int tot = 0;
    for(int i=0; i<ave; i++)
    {
        tot += analogRead(pin);
        if(delayms) delay(delayms);
    }
    return tot/ave;
}

in your loop():

for (int analogPin = 0; analogPin < 6; analogPin++) 
{
   int sensor = aveAnalogRead(analogPin);
     <<do your work here>>
}