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Version vom 11. September 2014, 14:46 Uhr
This page shows common code techniques that can be useful on the Arduino.
Mean filter
Problem: you have multiple ADC measurements (battery, ultrasonic etc.) that can contain outlier. What value is the most seen value? Solution: This code will sort and choose the center value. Example: 1,5,6,7,32 => returns center value (6)
unsigned int ADCmedian(int pin, int count) { int values[count], last; uint8_t j, i = 0; values[0] = 0; while (i < count) { last = analogRead(pin); if (i > 0) { for (j = i; j > 0 && values[j - 1] < last; j--) // Insertion sort loop. values[j] = values[j - 1]; // Shift ping array to correct position for sort insertion. } else j = 0; // First ping is starting point for sort. values[j] = last; // Add last ping to array in sorted position. i++; // Move to next ping. if (i < count) delay(1); } return (values[count/2]); // Return the median. }