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67 lines
1.9 KiB
Plaintext
67 lines
1.9 KiB
Plaintext
/*
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Smoothing
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Reads repeatedly from an analog input, calculating a running average
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and printing it to the computer. Keeps ten readings in an array and
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continually averages them.
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The circuit:
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* Analog sensor (potentiometer will do) attached to analog input 0
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Created 22 April 2007
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By David A. Mellis <dam@mellis.org>
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http://www.arduino.cc/en/Tutorial/Smoothing
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This example code is in the public domain.
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*/
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// Define the number of samples to keep track of. The higher the number,
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// the more the readings will be smoothed, but the slower the output will
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// respond to the input. Using a constant rather than a normal variable lets
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// use this value to determine the size of the readings array.
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const int numReadings = 10;
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int readings[numReadings]; // the readings from the analog input
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int index = 0; // the index of the current reading
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int total = 0; // the running total
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int average = 0; // the average
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int inputPin = A0;
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void setup()
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{
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// initialize serial communication with computer:
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Serial.begin(9600);
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// initialize all the readings to 0:
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for (int thisReading = 0; thisReading < numReadings; thisReading++)
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readings[thisReading] = 0;
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}
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void loop() {
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// subtract the last reading:
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total= total - readings[index];
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// read from the sensor:
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readings[index] = analogRead(inputPin);
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// add the reading to the total:
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total= total + readings[index];
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// advance to the next position in the array:
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index = index + 1;
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// if we're at the end of the array...
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if (index >= numReadings)
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// ...wrap around to the beginning:
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index = 0;
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// calculate the average:
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average = total / numReadings;
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// send it to the computer (as ASCII digits)
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Serial.println(average, DEC);
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}
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