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INDI Library v1.8.5 Released (19 Apr 2020)

April 2020 release of INDI Library v1.8.5 introduces new drivers while providing fixes and improvements to existing devices and core framework.

DIY focuser w/o Motor HAT or PiFace?

2 years 10 months ago
m.baldassarre.85
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DIY focuser w/o Motor HAT or PiFace? #19192
On the Amazon page it says "nominal voltage: 3.45 V, nominal current: 1.5A (monophase)".

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2 years 10 months ago
HelgeMK
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DIY focuser w/o Motor HAT or PiFace? #19193
Ok. But 1.5A exceeds the 1A the a4988 is designed for. In any case you would need to check the Vref pin - but pls check the pololu Instructions first...

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2 years 10 months ago
HelgeMK
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DIY focuser w/o Motor HAT or PiFace? #19194

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2 years 10 months ago
HelgeMK
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DIY focuser w/o Motor HAT or PiFace? #19195
Forgot to mention, there are loads of instructions on YouTube on how to convert the 28byj48 into a bipolar stepper - it is actually fairly easy to do.

Best, Helge

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2 years 10 months ago
m.baldassarre.85
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DIY focuser w/o Motor HAT or PiFace? #19196
I DID IT!!!! I took the risk and increased the voltage to 12 V, and not it works! I have no idea why it says 3.45V on Amazon, must be a typo!!

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2 years 10 months ago
HelgeMK
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DIY focuser w/o Motor HAT or PiFace? #19197
Fantastic, well done! - then current will presumably be lower than the 1.5A. Can you check what current is drawn?

I was also running a 5v stepper at 12v. Unless it is getting warm, should be ok - but I am not an electrician (=disclaimer).

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2 years 10 months ago
Kaczorek
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DIY focuser w/o Motor HAT or PiFace? #19198
That's what I thought after I saw your pictures ;-)
I'm glad you got it working!

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Radek Kaczorek
Astroberry Server | NEQ6 | Atik 460EX | Atik EFW2 | ASI 120MM

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2 years 10 months ago
m.baldassarre.85
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DIY focuser w/o Motor HAT or PiFace? #19250
Is there a way to have INDI calculate the necessary number of steps for backlash compensation? Or should I determine it by hand?

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2 years 10 months ago
Kaczorek
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DIY focuser w/o Motor HAT or PiFace? #19252
The driver does not calculate backlash value. You need to determine it manually

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Radek Kaczorek
Astroberry Server | NEQ6 | Atik 460EX | Atik EFW2 | ASI 120MM

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2 years 10 months ago
m.baldassarre.85
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DIY focuser w/o Motor HAT or PiFace? #19301
Any tips on what would be the best way to determine the number of backlash steps?

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2 years 10 months ago
Kaczorek
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DIY focuser w/o Motor HAT or PiFace? #19309
Just observe the focuser tube while travelling by small amount of steps.

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Radek Kaczorek
Astroberry Server | NEQ6 | Atik 460EX | Atik EFW2 | ASI 120MM

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2 years 9 months ago
Xamantek
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DIY focuser w/o Motor HAT or PiFace? #20176
Same problem as yours with rpi_focuser.

I run astroberry-server on a RPI3 and I am very happy with it.
All updates have been done (astroberry scripts and mate packages.

I am less happy with my actual focus motor and so I have tried to use the rpi_focus.

I have installed INDI Astroberry from the .deb file at sourceforge.net/projects/astroberry/ and I believe I used the required procedures (i said: I believe).
When I try to load the indi_rpifocus driver in indiserver (through graphical interface of EKOS configurator), no Astroberry Focuser tab shows up in focuser list.
Here is what I have done:

# from www.airspayce.com/mikem/bcm2835/index.html
# download the latest version of the library, say bcm2835-1.xx.tar.gz, then:
tar zxvf bcm2835-1.xx.tar.gz
cd bcm2835-1.xx
./configure
make
sudo make check
sudo make install

installed armf rpi (.deb) packaged indi driver (rev 1.04)
# not done what follows since I use a raspi3 and this is
# for RPI2 enable device tree support
# and I have not found that kind of setting in the raspi3 version of raspi-config
# sudo raspi-config
# under Advanced Options - enable Device Tree
Reboot.

I have also tried to install this afterward in the hope to get missing libs
but this does not seem to improve anything:

sudo apt-get install sense-hat

The rpi_GPS appears in the picklists but no rpi_focuser

Any idea ?

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