Source Code

This is the first prototype version, but still here's the source code if you are interested in how it's done:

#include <Servo.h>

Servo servos[2];


void move(int position) {
    static int current = -1;

    if (position == current) {
        return;
    }
    current = position;

    servos[0].attach(9); // right
    servos[1].attach(10); // left
    switch (position) {
        case 0:
            // Perk up.
            servos[0].writeMicroseconds(1500 + 300);
            servos[1].writeMicroseconds(1500 - 300);
            Serial.println("perk");
            break;
        case 1:
            // Droop down
            servos[0].writeMicroseconds(1500 - 300);
            servos[1].writeMicroseconds(1500 + 300);
            Serial.println("droop");
            break;
        case 2:
            servos[0].writeMicroseconds(1500 + 300);
            servos[1].writeMicroseconds(1500 + 300);
            Serial.println("left");
            break;
        case 3:
            servos[0].writeMicroseconds(1500 - 300);
            servos[1].writeMicroseconds(1500 - 300);
            Serial.println("right");
            break;
        default:
            Serial.println("unknown");
    }
}

void rest() {
    servos[0].detach();
    servos[1].detach();
}

void setup() {
    Serial.begin(115200);
    move(0);
}

void loop() {
    int z = analogRead(A0) - 490;
    int y = analogRead(A1) - 490;
    int x = analogRead(A2) - 490;

    Serial.print(x);
    Serial.print(", ");
    Serial.print(y);
    Serial.print(", ");
    Serial.print(z);
    Serial.println();

    if (x > -10) {
        if (y > 10) {
            move(2);
        } else if (y < -10) {
            move(3);
        } else {
            move(0);
        }
    } else {
        move(1);
    }
    delay(600);
    rest();
}