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My astronomy project:
Building an astroserver with a Raspberry Pi4


  1. Introduction
  2. The passive cooler
  3. Formatting the microSD card and transfer of the mirror file
  4. Setup KStars and Ekos
  5. Setup INDI Control Panel 'Telescope simulator'
  6. Setup INDI Control Panel 'Canon DSLR'
  7. Battery test
  8. Indoor test of focus control
  9. Adding a GPS receiver
  10. First Light
  11. Setup as Hotspot controlled from a pad
  12. Setup drivers peripheral
  13. Serial ports handling
  14. Good to know commands
  15. To be continued

Related projects:

  1. HEQ5 as portable mount
  2. Pentax 645 300 mm ED IF f/4 lens
  3. KStars / EKOS and Raspberry Pi4

I take no responsibility or liability for what are written here, you use the information on your own risk!

13: Serial ports handling

This is what cause me most problems. Every time I add a new device or move a USB cable to another port it refuse to connect to the device or devices. When you got it to work, never change anything !

Serial ports:

Every time the Raspberry starts up it order the different serial ports to some id. One common problem for me is the EQ6 mount, it looks like it prefer the port 0. If some device take this port before the mount refuse to connect, it's give an error and say the port is already connected to another device. I can disconnect the USB cables and then insert them once again in correct order with the Raspberry running. Normally that helps. But next time I start the Raspberry I have the same problem.

My friend show me some new commands that I can use to figure out what's going on.

Most important:
Never pull out a USB connector and insert it in another USB port. It's the same problem in Windows too.

EQ6 Mount / EQMOD driver:

Raspberry Pi4 setup serial ports

Command window:

Raspberry Pi4 setup serial ports

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