Stepper motor controller bottom view
Hochgeladen am 3.3.2014, 11:03 von Ad. 5 / 5
Very few components are required. 32 units can be controlled over a single I2C bus. my TX-bridge however only supports 4. It does however support advanced motor control in the sense that the motor speeds can be linked to each other. When setting different number of steps for two motors and designating one as master for the other, the motors will reach their destinations simultaneously. This is accomplished with the Bresenham algorithm which makes this ideal for plotters.
Stefan Falk (4.3.2014, 19:17:49)
WOW! These are quite fascinating features! If you would like to publish your work in more detail, we would be very glad to welcome your mail at ftpedia@ftcommunity.de to get in contact (totally independent whether you use English or German language). We can then answer any questions you may have. Give it a try!
From your image file names, I guess that you used the ft Community Publisher. I know I should provide an English language version of it, but just a tip: Double-clicking on an image will open the image editor. There you can easily crop the image to avoid unused space around the main objects, and use controls to sharpen or lighten (especially gamma correction) the images.
Deeply impressed, Stefan
schnaggels (6.3.2014, 10:29:58)
Indeed, this is really a nice piece! If you plan to order more of the PCBs please let me know :)
Ad (6.3.2014, 16:59:11)
The print you see in the picture was home-made (single sided) but designed with Eagle and hence could also be ordered from OSHPark for the same price as the tx-bridge because you pay per square inch ($5/in2). If I would order there I would however redesign it as a double sided PCB for wider traces and better cooling. It costs the same. Of this PCB you would need one per stepper motor so you could probably fill an order of three for your own. I will post this design as well and when I have time, redesign the PCB. The chips I ordered directly from ONSEMI (I think 5 for $25 or so). The alternative (without stall detection) TMC222 costs about ¤10 at Reichelt.
Ad (6.3.2014, 17:03:20)
By the way, the Bresenham algorithm resides in the tx-bridge not in the motor controller.