mirror of https://github.com/noisymime/Arduino.git
44 lines
1.6 KiB
Plaintext
44 lines
1.6 KiB
Plaintext
/*
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* Smoothing
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* David A. Mellis <dam@mellis.org>
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*
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* Reads repeatedly from an analog input, calculating a running average
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* and printing it to the computer.
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*
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* http://www.arduino.cc/en/Tutorial/Smoothing
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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 #define 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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#define 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 = 0;
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void setup()
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{
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Serial.begin(9600); // initialize serial communication with computer
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for (int i = 0; i < NUMREADINGS; i++)
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readings[i] = 0; // initialize all the readings to 0
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}
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void loop()
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{
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total -= readings[index]; // subtract the last reading
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readings[index] = analogRead(inputPin); // read from the sensor
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total += readings[index]; // add the reading to the total
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index = (index + 1); // advance to the next index
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if (index >= NUMREADINGS) // if we're at the end of the array...
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index = 0; // ...wrap around to the beginning
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average = total / NUMREADINGS; // calculate the average
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Serial.println(average); // send it to the computer (as ASCII digits)
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}
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