I am using a raspberry pi with Pololu stepper drivers. I've described this in an earlier post.
Now comes the job of making this work - initially for guiding and hopefully later for 'goto' as well (albeit that will be a bit slow with these motors).
The ingredients are:
- pi model B
- 2 pololu drivers mounted on a little HAT card as described here
- a 24v power supply to drive the stepper motors
- CAREFULLY set the current limit on the pololu driver carriers
- write a test program to do some basic testing of the drivers / motors
- Prepare a second raspberry pi to run this nice autoguiding software
- do a quick hack to enable Gordon'd autogider software to talk to my driver software.
and below is the gory details.....
I am running this on a pi model B......
- started with clean install of jessie lite (2016-11-25-raspbian-jessie-lite.img)
- usual new pi things like enable ssh, expand filesystem and setup nfs server
- sudo apt-get install python3
- setup pigpio as detailed here
- and set it to start at raised priority automatically at boot:
sudo crontab -e
- add this to the end of the crontab file:
@reboot /usr/bin/nice -n -5 /usr/local/bin/pigpiod
- link up to my file server
- STILL *sigh* have to fix the rpcbind - nfs server screw up - from here
That's the basic setup completed