🔧 What Does a Servo Need? A servo motor expects a control signal (PWM) every 20 milliseconds (50 times per second). This signal must stay HIGH for a specific time between: 0° angle → 500 microseconds HIGH pulse 90° angle → 1500 microseconds HIGH pulse 180° angle → 2500 microseconds HIGH pulse So, the width of the HIGH pulse determines the angle of rotation. After the HIGH pulse, the signal is kept LOW for the […]
🧠 Concept Overview 🌊 How Ultrasonic Distance Measurement Works The ultrasonic sensor sends a 10 µs pulse via the TRIG pin. The ECHO pin goes HIGH while the signal travels to the object and back. The duration (in microseconds) that ECHO stays HIGH is proportional to the distance. Speed of sound ≈ 343 m/s or 0.0343 cm/µs. Since the sound wave travels to the object and back, the formula is: Distance (cm) = (Time (µs) […]
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