Attiny 85 e servomotore: amore possibile!

Per muovere un servomotore ci vuole una libreria apposta per Attiny, la Softwareservo.h,
per la programmazione dell'Attiny  vi rimando qui.
Lo schema qui sotto:

qui il codice ad esempio per il Knob:

#include <SoftwareServo.h>

#define PIN_SERVO 0

#define PIN_POT 2

#define PULSE_MIN 600 // in microsecs

#define PULSE_MAX 2400 // in microsecs

#define READINGS_COUNT 10

SoftwareServo servo;

long potValue = 0;

int readings[READINGS_COUNT] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

byte readingsPos = 0;

unsigned long nextReadingDue = 0;

void setup(){

servo.attach(PIN_SERVO);

servo.setMinimumPulse(PULSE_MIN);

servo.setMaximumPulse(PULSE_MAX);

}

void loop(){

// read the analog pin once every millisec, and store the data until we have enough to filter

unsigned long currentTime = micros();

if(currentTime > nextReadingDue){

readings[readingsPos] = analogRead(PIN_POT);

readingsPos ++;

nextReadingDue = currentTime + 1000;

}

// once every READINGS_COUNT readings, clean the data and update the servo

// also filter using weighted moving average to avoid excessive jittering due to poor potentiometer

if(readingsPos > READINGS_COUNT){

potValue = (9 * potValue + getCleanReading())/ 10;

servo.write(map(potValue, 0, 1023, 0, 180));

readingsPos = 0;

}

// good to call this as often as we can, so that we don't miss the moment when the signal has to go up or down

SoftwareServo::refresh();

}

// reads several analog values and tries to do some smart filtering

int getCleanReading(){

int reading, minReading=9999, maxReading=0;

long result = 0;

for(byte i=0; i<READINGS_COUNT; i++){

readings[i] = analogRead(PIN_POT);

result += readings[i];

if(readings[i] < minReading){

minReading = readings[i];

}

if(readings[i] > maxReading){

maxReading = readings[i];

}

}

// reaturn the average after eliminating min and max readings

return (result - minReading - maxReading) / (READINGS_COUNT - 2);

}