Servos are similar to motors, but can typically only move from 0 to 60/120/180 degrees, rather than rotate continuously. Unlike a motor, you send a servo a signal that makes it go to a specific position (eg 30 degrees), making them ideal for applications such as moving parts of robots, or controlling surfaces on an aircraft. That’s a little complicated to cover in this tutorial – a simpler use case is using a servo to turn an analogue potentiometer. Here we are going to create some simple software that will allow a Raspberry Pi to control the volume knob on a simple speaker amplifier, which could be used as part of a remote control project. This step- by-step tutorial assumes that you have already soldered the pin headers onto the Adafruit board.
What you’ll need
- Latest Raspbian image
- Adafruit PCA9685 servo controller
- 5V power supply
- Female-to-female jumper cables
- A servo suited to your needs
Featured Adafruit Product!
Adafruit 16-Channel 12-bit PWM/Servo Driver – I2C interface: You want to make a cool robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. Or maybe you want to drive a lot of LEDs with precise PWM output. Then you realize that your microcontroller has a limited number of PWM outputs! What now? You could give up OR you could just get this handy PWM and Servo driver breakout. Read more.
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