SP11 stepper motor slower rpm than expected
Hi, I have completed printing and assembly of SP11, but am having a problem with the second hand taking about 1 min 17 seconds to complete one revolution. Similarly, watching the stepper gear rotate, it rotates slower than the 6.9 rpm the manual indicates it should (by eye and a stopwatch it appears to be closer to 5.4rpm). I am using the cnc shield, with arduino nano. I purchased a 1.8deg stepper motor (model #17HS15-1504S-X1) , and have the pin setup on the cnc shield set to option 5 [0101] as indicated in the manual. When I look at the debug info in serial monitor, it does appear to recognize that I have set option 5 for speed, and when it counts the seconds and logs each minute, they seem accurate to my stopwatch at 1 minute per debug line. It just seems to be my motor is not running at the expected RPM for the setting, and I am unsure what else to troubleshoot. Any suggestions are welcome, if there's any other info I can provide, please let me know. -J.
Thanks Steve, this worked! So excited to get this working now :) I went back to try and understand how I ended up with such an old version of the arduino software, and found this issue with the instructions that were sent to me in the myminifactory download package: The link to the sp10 page in the document provided with the stl files actually links to the sp9 clock page on your site:
I obviously was not paying enough attention to what page I landed on then, and just downloaded the arduino file linked at the bottom (which still gives the 1.05 version). Anyway, thanks again for the wonderful design, and the assistance getting it working. -J.