Kevin Ross created a new topic ' INDI focuser driver for Waveshare Motor HAT for Raspberry Pi' in the forum. 2 months ago

Hello all!

I have written a new INDI driver, for the Waveshare Motor HAT. I've been using Radek Kaczorek's driver for the Adafruit Motor HAT for a while now, and while it works, I came across this Waveshare HAT which looks to be a bit better.

Advantages of the Waveshare Motor HAT versus the Adafruit Motor HAT:

  • Real stepper driver, a Texas Instruments DRV8825
  • Up to 1/32 microstepping, for super quiet and smooth focusing
  • Adjustable current limiting
  • Doesn't use i2c
  • Can power the Pi and the stepper motor with a single 12V connection. No more 12V and 5V dual power to the Pi!

Even with 1/32 microstepping, I can get very reasonable speeds, since we're not using i2c, but are just triggering a single GPIO pin every time we want to step the motor. At 1/32 microstepping, I can get a full revolution of a 1.8 degree stepper motor in about half a second. 1/16 or 1/8 microstepping will, of course, be 2x and 4x faster, respectively.

From a programming standpoint, controlling the stepper is quite simple, and they include sample C code (unlike Adafruit which only includes Python code, which must be ported to C). My driver code was heavily inspired by (read: stolen from) Radek Kaczorek's original astroberry-amh driver.

Anyway, the code is here. If you do try it out, drop a note and let me know how it works out for you!


Alfred thanked Kevin Ross in topic Crash in autofocus 11 months ago

Kevin Ross created a new topic ' Crash in autofocus' in the forum. 11 months ago

I very often get a crash in the autofocus routine. So last night I ran KStars in the VS debugger (KStars built locally from source). The crash was a stack overflow, in FITSData::trace(). The call stack was an endless list of FITSData::trace calling itself recursively. This happens quite often, unfortunately. This is on Win10 64-bit.

I was frustrated that it kept happening on the first clear night in months, so I did not get any other debugging info (no logs, etc.). Sorry about that. If the above is not enough of a hint to figure out the problem, I can get more data on the next clear night (who knows when).

Unless, of course, I can replicate the problem in daylight (possible, not tried). I will try to replicate it during the day to gather more debugging info, and to try to come up with an easily reproduceable test case.

-- Kevin


Kevin Ross replied to the topic 'Differences in main scope / guide scope polar alignment' in the forum. 12 months ago

I have similar guiding setup as you, and routinely get under 2' PA error. I have a ZWO 60mm f/4.6 guidescope (276mm focal length) and a QHY 5L-IIm guide camera (same as you), which I use for PA.


Kevin Ross replied to the topic '"Error: No connection to the internet" when plate solving' in the forum. 2 years ago

Just curious, but is that networkAccessible() check necessary? Could it be removed, and let the code fail normally if there's no network connection?


Kevin Ross replied to the topic 'Lost star when dithering causes capture module to hang' in the forum. 2 years ago

Yes I noticed the same thing. Sometimes that first correction after dithering is a big one, and it does affect the image.