double-servo.ino
The Servo library handles up to 12 servos on the Mega via timer 1: here a panning head and a tilt axis sweeping at different amplitudes. Each servo on its own 5 V rail prevents brown-outs.
Hardware required
An Arduino Mega 2560 (ATmega2560, 16 MHz, 5 V): 54 digital I/O, 15 PWM, 16 analog inputs, 4 hardware UARTs. 2 servos (SG90) + external 5 V supply.
Wiring
Signals to 9 and 10, +5 V and GND paralleled with the board (common grounds).
How it works
Two independent state machines sweep within their bounds; timer 1 of the ATmega2560 generates the pulses without blocking loop(). In the Arduino IDE, select « Arduino Mega 2560 » and the port, then Upload. PWM on 2-13 and 44-46; UART1=18/19, UART2=16/17, UART3=14/15; SPI on 50-53.
Going further
Add a joystick (2 potentiometers on A0/A1) for manual head control.
double-servo.ino
// Deux servos independants : panoramique + inclinaison.
#include <Servo.h>
Servo tete, cou;
int a = 0, b = 90;
int sa = 3, sb = 2;
void setup() {
tete.attach(9); // panoramique
cou.attach(10); // inclinaison
Serial.begin(9600);
}
void loop() {
tete.write(a);
cou.write(b);
a += sa; b += sb;
if (a <= 0 || a >= 170) sa = -sa;
if (b <= 45 || b >= 135) sb = -sb;
delay(30);
}