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My astronomy project:
Building a battery box and an astro server


  1. Astroserver and powerbox, ver 1.0
    1. Introduction to battery box and astroserver
    2. Fuse box and fuses
    3. Box and charging
    4. Overview computer and accessories
    5. USB 5 volt external power
    6. Motor focus power
    7. Get rid of messy cables
    8. Cleaning up installation
    9. First outdoor test
    10. Replacing USB-Hub
    11. USB-Hub and focus driver holder
  2. Astroserver and powerbox, ver 2.0
  3. Balcony outdoor outlets
  4. Lithium Battery power

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

Page I.5: USB 5 volt external power

In my tests it have shown that use a USB without external power supply provides much trouble. In order to overcome it I have built myself a power supply for the USB hub. Started from a USB cigarette converter. Normally, you can usually take up to 2 Amp at 5 volts, the one I found in the drawer looks however very weak so have probably a much smaller maximum current, but enough for my needs.

20 12 to 5 volt converter

In connection with this, I also disconnected the Focus driver so it does not take power from 5 volt USB. 5 volts gives to low torque of the motor. You can configure the controller as it takes power from the outside and can handle up to 8 Volts. It's the same voltage that I feed to the camera, i will modify the setup so that camera and motor focus share the same 8 voltage. A bit risky it is, step motors can provide some spikes on the voltage that in the worst case could destroy the camera. But I trust it enough to make an attempt.

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