Questions about DRV8825-HW203 board layout

[Scott Jarvis]

Hi,
I have built a basic stepper motor setup using the ULN2003 and stepper that came with a arduino starter kit. I am now getting ready to try building a focuser for my scopes. I have ordered the parts to build a focuser setup using a DRV8825 and NEMA17-PG27 and ordered the printed board from Aisler (DRV8825-HW203 Rev 3). I have a couple of questions before I begin soldering everything together.
1) In the upper right corner of the board, jumper 14 is listed as HPSW. What is HPSW? I don't see anything listed in the parts list that corresponds to it.
2) The board looks like it is set up for bluetooth (J12 BT1). If I am not using bluetooth is there anything I need to do for this jumper? If I were to add BT, I don't see a part listed in the parts list.
3) Finally, I see a 3A resettable fuse listed on the board but not parts list. Would a 16V 3A fuse work?
Thanks for any guidance anyone can offer.

[brownrb]

1) HPSW is the home position switch. See the PDF or one of the videos (there is a video dedicated to the home position switch) - most users leave it off, so leave comment in firmware commented out to disable it
//#define HOMEPOSITIONSWITCH 1

See video
https://www.youtube.com/watch?v=ADi2W0nsypI
2) if you want bluetooth you need hc05 adapter. But if using usb cable mot necessary. It is an option, same as home position switch - not needed. you just leave the statement in the firmware commented out to disable it
//#define BLUETOOTH 1
3) You can fit a small 20x5 fuse holder instead, or you can use a PTC Polymer Resettable Fuse 3A. I think you will find a 6A the leads will be too thick.

[brownrb]

There is also an assembly video
https://www.youtube.com/watch?v=aB0vM2evxEM

[Scott Jarvis]

Thanks! I did watch the video which cleared up several other questions I had, but the pcb in the video doesn't match the version I bought. (rev 3) and didn't see the info in the pdfs. Hopefully the build goes well and the weather clears so I can try it out. Thanks again.
Scott

[brownrb]

Yes, I updated the PCB a couple of weeks ago to make sure BlueTooth and HPS was on the PCB. This was after the assembly video was done. But its just two extra headers to put on the PCB.

Make sure you adjust the drv8825 pot to get best stepping -there is a video on this also.

Best wishes for your build