| /* | |
| Smoothing | |
| Reads repeatedly from an analog input, calculating a running average and | |
| printing it to the computer. Keeps ten readings in an array and continually | |
| averages them. | |
| The circuit: | |
| - analog sensor (potentiometer will do) attached to analog input 0 | |
| created 22 Apr 2007 | |
| by David A. Mellis <dam@mellis.org> | |
| modified 9 Apr 2012 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/Smoothing | |
| */ | |
| // Define the number of samples to keep track of. The higher the number, the | |
| // more the readings will be smoothed, but the slower the output will respond to | |
| // the input. Using a constant rather than a normal variable lets us use this | |
| // value to determine the size of the readings array. | |
| const int numReadings = 10; | |
| int readings[numReadings]; // the readings from the analog input | |
| int readIndex = 0; // the index of the current reading | |
| int total = 0; // the running total | |
| int average = 0; // the average | |
| int inputPin = A0; | |
| void setup() { | |
| // initialize serial communication with computer: | |
| Serial.begin(9600); | |
| // initialize all the readings to 0: | |
| for (int thisReading = 0; thisReading < numReadings; thisReading++) { | |
| readings[thisReading] = 0; | |
| } | |
| } | |
| void loop() { | |
| // subtract the last reading: | |
| total = total - readings[readIndex]; | |
| // read from the sensor: | |
| readings[readIndex] = analogRead(inputPin); | |
| // add the reading to the total: | |
| total = total + readings[readIndex]; | |
| // advance to the next position in the array: | |
| readIndex = readIndex + 1; | |
| // if we're at the end of the array... | |
| if (readIndex >= numReadings) { | |
| // ...wrap around to the beginning: | |
| readIndex = 0; | |
| } | |
| // calculate the average: | |
| average = total / numReadings; | |
| // send it to the computer as ASCII digits | |
| Serial.println(average); | |
| delay(1); // delay in between reads for stability | |
| } | |