servo-balayage.ino
The Servo library generates the control pulse (1-2 ms) and sweeps the angle end to end. Feeding a mid-size servo from a dedicated 5 V rail avoids brown-out resets from current spikes.
Hardware required
A LilyPad Arduino (ATmega168V/328V, 8 MHz, 3.3 V) with its sew tabs, programmed via an FTDI cable (breakout) and powered by 3.7 V (LiPo) or 5 V on V-REG. 1 standard servo (SG90/MG90S) + recommended external 5 V supply.
Wiring
Orange (signal) to pin 3, red to +5 V, brown to GND (common ground with the board).
How it works
myservo.write(angle) sends a pulse whose width maps the angle; 5° steps every 50 ms give smooth motion. In the Arduino IDE, select « LilyPad Arduino » and the FTDI port, then Upload. Conductive thread adds a few ohms of resistance: keep runs short and insulate crossings.
Going further
Add a potentiometer on A0 for a position → servo feedback loop (robot radar).
servo-balayage.ino
// Balayage servo 0..180 degres avec la bibliotheque Servo.
#include <Servo.h>
Servo myservo;
int angle = 0;
int sens = 1;
void setup() {
myservo.attach(3); // broche avec pin signal du servo
Serial.begin(9600);
}
void loop() {
myservo.write(angle);
angle += sens * 5;
if (angle >= 180 || angle <= 0) sens = -sens;
delay(50);
}