![]() ![]() The H-bridged in case is a Monster Moto shield. In this case I used an Arduino Uno, but any type will do actually. The electronics part of our giant servo is composed of an Arduino, an H-bridge and the potentiometer we just glued onto the motor shaft. I then used lots of hot glue to fix both ends together. To fix the potentiometer on the other end I cut up a dial knob and pushed it topsy-turvy on its shaft. I took a small end of 8mm aluminium tube, thread-tapped it to fit the motor axle and screwed it on the thread on the axle. Although this turned out rather well for sliding both brackets together in the next step, I could have fixed the brackets just as wel on any surface. I mounted both brackets on some length of 4040 aluminium profile. The main challenge in this proved to be to drill the potentiometer shaft hole at the exact height so it would align perfectly with the motor axle. The potentiometer bracket required two holes be drilled: one to fit the potentiometer shaft, the other to hold the potentiometer peg to prevent it from turning along with the motor. the potentiometer I had to cut a large hole into the motor bracket to fit the shaft and I drilled an extra hole to be able to fit all the mounting screws of the motor. The brackets will require some work before they will fit the motor resp. This is done by using two opposing brackets, one holding the motor, the other holding the potentiometer. By reading the value of the potentiometer, we will know the rotation of the motor. In our case, this is achieved by mounting a potentiometer to the shaft of the motor. The key to controlling any servo is for the controller to know at any moment what the position of the horn is. See the appropriate datasheet for specifics. For the same reason, the H-bridge may require a heatsink mounted on top of the chips. The wire should be capable of carrying the stall-current of the motor at the motor's operating voltage. Make sure to do some calculations before selecting the wire, for instance using this tool. Couple of inches of brass or aluminium tube Īlthough of course any type of electrical wire will do, a wiper motor under any serious load will draw a reasonable amount of current.Motor controller (such as the Sparkfun Monster Moto shield, or any other high current H-bridge).Potentiometer (I used a 50K one, but that doesn't really matter).Windshield wiper motor (or any other strong DC motor).This will be covered in the next section. ![]() So when the shaft of the motor is at the desired position, power supplied to the motor is stopped.Just a few parts are needed to create this big boy, although some parts require a bit of modification before they fit the design. The motor is attached by gears to the control wheel.Īs the motor rotates, the potentiometer's resistance changes, so the control circuit can precisely regulate how much movement there is and in which direction. Inside the servo (check the above photos), there is a pretty simple set-up: So from here we define that in order to understand how the servo works we need to take a look under the hood. The motor is controlled with an electric signal which determines the amount of movements of the shaft. Unlike the stepper and DC motors the servo circuitry is built right inside the motor unit and has a positionable shaft, which usually is fitted with a gear. They are small in size but pack a big punch and are very energy-efficient, which makes them superior choice for many applications. Servo motors has been around for a long time and are utilized in many applications. Step 1: Lear What Are the "servo Motors"! Test your first servomotor control program.Make the appropriate wiring diagram with an Arduino board.Take a look inside the servomotor hood.So we hope that this tutorial contains the needed documents. Today' I'm posting thsi informative tutorial to teach you the basics of any servomotor control, I already posted a video about controlling speed and direction of DC motors and stepper motors and today we will get started with the servos and this way we are done with most of the important actuators that a maker can use.ĭuring the making of this tutorial, we tried to make sure that this tutorial will be the best guide for you in order to enjoy learning the basics of servomotors controlling because learning the working process of the electronics actuators is so important for projects development. Hey guys! welcome to my new tutorial, I Hope you already enjoyed my previous tutorial " Large stepper motor control ". ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |