FabScanPi HAT and A4988 Driver - [Hardware] Electronics https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/ FabScan Discussion Board en-US Tue, 18 Aug 2026 04:27:09 +0000 wpForo 60 RE: FabScanPi HAT and A4988 Driver https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-973 Tue, 03 Mar 2020 11:51:40 +0000 It is explained on this topic:  https://fabscan.org/community/f-a-q/configuration-for-400-step-motor/paged/2/#post-751

]]> [Hardware] Electronics mario https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-973 RE: FabScanPi HAT and A4988 Driver https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-932 Sat, 22 Feb 2020 08:36:15 +0000 Hello,

should there all three soldered, like this????

230

 

]]> [Hardware] Electronics archeotron https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-932 RE: FabScanPi HAT and A4988 Driver https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-822 Thu, 16 Jan 2020 14:19:12 +0000 @mario

ah, good tip. 
haven't gotten that far yet, was just glad that the motor was moving at all

 

Cheers

]]> [Hardware] Electronics agressor https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-822 RE: FabScanPi HAT and A4988 Driver https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-821 Thu, 16 Jan 2020 14:17:11 +0000
Posted by: @agressor

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.

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]]> [Hardware] Electronics mario https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-821 FabScanPi HAT and A4988 Driver https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-820 Thu, 16 Jan 2020 12:33:28 +0000 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.

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 needs a connection of Reset and Sleep to VCC

The fancy stepsticks 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

]]> [Hardware] Electronics agressor https://fabscan.org/community/hardware/fabscanpi-hat-and-a4988-driver/#post-820