Servo Control Lesson (Challenge)

PHASE 1: Think First (No Code)

🧠 Goal

Your task is to build a program that controls two servo motors using the Serial Monitor.

One servo should move to the angle you type
The second servo should move in the opposite direction

🔧 What You Need to Figure Out

How do you control a servo motor in Arduino?

How do you connect (attach) a servo to a pin?

How do you send and receive data using the Serial Monitor?

How do you make sure the angle stays between 0 and 180?

How can you make one servo move in the opposite direction?

PHASE 2: Tools You Can Use

🧩 Servo Setup

#include <Servo.h>

Servo servo1;

Servo servo2;

🧩 Setup Commands

Serial.begin(9600);

servo1.attach(A1);

servo2.attach(A2);

servo1.write(90);

servo2.write(90);

🧩 Reading Input

Serial.available() > 0

int angle = Serial.readStringUntil('\n').toInt();

🧩 Safety

angle = constrain(angle, 0, 180);

🧩 Moving Servos

servo.write(angle);

🚀 Decide: Which servo follows the input? Which one should be reversed?

PHASE 3: Logic Challenge

🎯 Expected Behavior

Input 0 → Servos: 0° and 180°
Input 90 → Servos: 90° and 90°
Input 180 → Servos: 180° and 0°

If input = 30 → output should be 150 If input = 60 → output should be 120

💡 Hint

What number are you subtracting from?

PHASE 4: Build It

🧪 Steps to Try

Set up two servo motors
Open Serial Monitor
Send a number (0–180)
Make both servos respond correctly

🚀 Final Challenge: Build the entire program using ONLY the commands above.

PHASE 5: Think Deeper

What happens if you remove the mirror logic?
How could you control more than two servos?
How would you make the movement smoother?

🤖 Servo Control Lesson (Student Challenge)