Hi,
got the FabScanPi Hat and the wooden frame about a year ago. The basic setup was easy enough but the "advertised" use of the old a4988 drivers posed a bigger set of problems. [i have a lot of the older drivers laying around and wanted to use those for this piece of kit]
After about a week of troubleshooting without any movement of the steppermotor including the use an oscilloscope and bitsniffer my frustrated indexfinger found the solution accidentaly. While hotswaping the driver the motor suddenly sprang to life...
For the A4988 to work the Reset and Sleeppin have to be connected. The HAT itselfe does'nt provide this so you have to solder this bridge yourself.
For the DRV8825 [another one of the olds] needs a connection of Reset and Sleep to VCC [also DIY soldering]
The fancy stepsticks [TMC####] do not seem to need those connected to anything.
I have not fornd any mention of this in the documentation. hopefully you can use this information for your Fabscan with the older hardwarebits
For the A4988 to work the Reset and Sleeppin have to be connected. The HAT itselfe does'nt provide this so you have to solder this bridge yourself.
Thank you for reporting! I will add this to the documentation. But i think there is one more thing. You need to set micro stepping for those drivers. The TMC drivers are 1/16 by default. The HAT does not configure the pins MS1 - MS3 for a A4988 by default. The solder pads on the HAT are open. You need to bridge the pads for setting the driver to 1/16 step.
ah, good tip.
haven't gotten that far yet, was just glad that the motor was moving at all
Cheers
Hello,
should there all three soldered, like this????
It is explained on this topic: https://fabscan.org/community/f-a-q/configuration-for-400-step-motor/paged/2/#post-751
