Servo motors can rotate to a specified angle and hold that angle against a resistive force. This makes Servos great for creating a DIY pan-and-tilt camera system, for moving panels through a limited distance in a model aircraft where the wind might provide resistance to that movement, and in many cases in robotics where you might need to rotate something to a specific angle. In this tutorial, we’ll cover how to connect and control a servo motor with a BeagleBone black running Linux.
Higher torque servos can run at a higher voltage than a BeagleBone Black will supply, so you might need to bring an external power source into the mix. To make things interesting, the servo for this article needs at least 6 Volts and is mounted into a gearbox to trade some RPM for even more torque.
Using an external power source means you only need two pins from the BeagleBone Black, a PWM pin (the white wire in the figure, above) to control the Servo and a ground pin to ensure that both power sources have a common ground (green wire) to operate from.
The BeagleBone Black is a small 1 Gigahertz (Ghz) ARM machine with 512 Megabytes (MB) of RAM, 2 Gigabytes (GB) of on-board flash memory, and most importantly, two headers each with two rows of pin sockets ready for your next embedded project. In this series on the BeagleBone Black we have seen how to use the Linux interface allowing us to access chips over SPI and receive interrupts when the voltage on a pin changes.
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.