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Motor control

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STEPPER MOTOR CONTROLLING « PAVAN's Blog. Intro to Stepper Motors A stepper motor is a permanent magnet or variable reluctance dc motor that has the following performance characteristics: 1. Rotation in both directions 2. Precision angular incremental changes 3. Repetition of accurate motion or velocity profiles 4. 5.

A stepper motor can move in accurate angular increments knows as steps in response to the application of digital pulses to an electric drive circuit from a digital controller. Stepper motors are either bipolar, requiring two power sources or a switchable polarity power source, or unipolar, requiring only one power source. Stepping Modes Like this: Like Loading... Web-controlled watering can and vortex tube. UPDATE: Code added at the bottom of this post. This is an interactive art project that I have been building for an upcoming exhibition.

The idea for a web-controlled watering can come from the first "iphone watering can" that I helped build with a friend for Maker Faire a couple years ago. Search the internet/youtube for "iphone watering can" for details. This new version uses a different drive mechanism and a PD control loop to make the watering can track the desired position in realtime. The interface works with any webkit browser. My collaborator and I have discussed using the iphone or android accelerometers to achieve control through phone tilting. The siteplayer webserver is extremely old technology and has many problems, but does work. HTML file from Siteplayer webserver: SPI file from Siteplayer webserver (simply to establish a server response): Russ Nelson. This is the second in a series of postings about the Makezine controller. The first one was the Jedi Cursor. Most 5.25" floppy disk drives have a stepper motor in them for positioning the head, plus interesting widgets like optical emitters and detectors.

With a little bit of work, they can be removed and put back into service with your Makezine controller. I put together a set of photos showing how I disassembled my floppy disk drive and removed the useful bits. A stepper motor has magnets, poles, and windings. The windings go around the poles, and you energize the windings in a specific order to make the motor turn in one direction or the other. A motor can have four, five, or six wires coming out of it. A stepping motor with four wires has only two windings and is bipolar.

Once you have the motor connected, you will need to drive it with the correct sequence. Run the program like this. Guilherme Martins : Control your motors with L293D. After long research and trial and error, I´ve came up to a new walkthrough regarding this nice chip, the L293D. Each project is one project and each one has its own unique power configurations, so you must be aware of the best battery choice and how to distribute voltage through your robot. I strongly advice you to read the following articles: Picking Batteries for your RobotOnce you’ve decided on batteries, how do you regulate the voltage L293D gives you the possibility to control two motors in both directions – datasheet The L293D Circuit: Basic Implementation: This is the most basic implementation of the chip.

As you can see, a 5V Voltage Regulator is between the battery and pins 1, 9, 16. Pin 8 gets power before the VReg, if your motor needs for example 6V you should put 6V directly in this pin, all the other pins should not get more than 5V. This will work with no problem at all, but if you want to do the right implementation take a look at the next example: My 1st instructable :)