Stepper Motor Driver Pc Linux Operating
Jun 03, 2017 Stepper Motor Driver Pc Linux 2016 Download While conventional electric motors spin continuously, stepper motors only move one step at a time. They can be used for precise motion and position. The simplest way to think of a stepper motor is a. Tic T500 USB Multi-Interface Stepper Motor Controller, bottom view with dimensions. This picture shows the original tic03a version that shipped prior to 3 January 2019.
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Hardware
I decided to control the stepper motor using a Linux PC with parallel ports (yes, people are still building motherboards with parallel ports), because developing software for desktop Linux is much easier. Oh, for tablets and smart phone fans, how do your devices talk to physical world?In searching for a proper driver chip/board for the stepper motor, I came across the handy EasyDriver board designed by Brian Schmalzhaus. I just need to provide one rising edge to the STEP pin of it, the stepper motor will rotate one step. I can control the direction of rotation and step size by configuring certain pins. It saves me the hassle of computing waveforms for controlling stepper motors. Check the references below to see how EasyDriver can simply your life.
Lastly, very important, let the EasyDriver board and the PC share the common ground. Otherwise the control signal from parallel port may not work (e.g., a high from parallel port is not high to the ground level of EasyDriver), or the parallel port might get burned.
Oh, one more thing, the EasyDriver board only drives bipolar stepper motors.
My circuit is prototyped on a breadboard like below:
The circuit takes power from the power supply of the desktop computer on which the control software will run. I used Pin 2 and Pin 4 of the parallel port to control the STEP and DIR on Easy Driver. MS1 and MS2 are grounded because I only use full step mode. I used two LEDs to show the signals from parallel ports.
Here is circuit in reality. As you can see, the circuit takes power from the old floppy disk power jack.
I used Saleae's Logic as a USB logic analyzer to check the waveforms. As you can see, for every rising edge on channel 4, the state of the first 4 channels change.
Software
At first I planned to use parapin, a C-based library for parallel port I/O. I used it when I was in college. After googling, I found out a Python module called PyParallel and it greatly simplifies software development.I wrote a small piece of Python code below to control it.
Note
1. The chip on EasyDriver can get really hot - up to 136 Celsius! Do not use it with a motor that requires lots of current and/or rotate the motor too frequently. Mine got burned out pretty soon. So I am ordering a motor with less torque but smaller current.2. Do not send pulse to STEP pin of EasyDriver faster than the maximum speed of your motor. It will cause damage.
Questions and comments are all welcome!
References:
1. Easy Driver Example by Brain Schmalzhaus himself, http://www.schmalzhaus.com/EasyDriver/Examples/EasyDriverExamples.html2. Easy Driver Example by Sparkfun, https://www.sparkfun.com/tutorials/400