The inexpensive servos we use for hobbyist applications are usually analog servo motors, which are the types we will be using today.Ī very common and inexpensive servo motor is the SG90. Servo motors come in a wide range of sizes and can be controlled either with an analog PWM signal or with a digital I/O signal. There are specially modified servo motors that can rotate beyond 360-degrees, but we won’t be working with those today. Most servos are limited in rotation to either 180 or 270 degrees, with 180-degree servo motors being more common. A high gear ratio allows a small servo to have an impressive torque rating. Servo motors are geared DC motors that have an integrated servomechanism with a feedback loop to allow precise positioning of the motor shaft. Built-in WiFi and Bluetooth open the door to all sorts of remote control possibilities. The latter reason is why many people choose the ESP32 over an Arduino for controlling servo motors. It has built-in WiFi and Bluetooth capabilities.It has a lot of PWM output pins, so it can drive several servo motors. The ESP32 has I/O pins that can be used as touch switches.There are built-in sensors in the ESP32, including a hall-effect sensor.The ESP32 has analog outputs as well as analog inputs.
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