Project:
HEQ5 as portable mount

Contents:

1. Introduction
2. Power terminal of HEQ5 changed
3. Installing the 300 mm lens on HEQ5
4. Rewiring the electric cables
5. Connecting the Raspberry
6. Power consumption
7. Battery power cables
8. Tweaking auto guiding parameters
9. Rowan Belt Modification Kit
10. Making the tripod to a low rider
11. Redesign of mount head details
12. Raspberry Pi4 bracket
13. Brackets: temperature sensor, spirit level and stepper motor
14. Transport box
15. Brackets reinforced and adapt it to EQ6
16. HEQ5 and TS130 refractor ?
17. 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

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

12: Raspberry PI4 bracket

The Raspberry processor has to be mounted on the dovetail somewhere. It take power from the USB HUB and I want as short cables as possible. Earlier it was only hold in place by a stripe. Now I want to make a more serious bracket for it.

HEQ5 mount head:

One of the better places is below the focus motor (image upside down). I already had prepared the place with a couple of M3 threaded holes.

The Raspberry computer isn't big, from this place all wires will be short. Easy to reach the USB memory and the RJ45 socket on the left side.

In FreeCAD I have designed this cage that will hold the Raspberry in place. In the middle to the left is a lock mechanism to not let the Raspberry slide out. Lot of openings to have the air cool it down.

Waiting for the bracket to cool down before I released it from the printer bed. It looks more like a building with all the supports. When it have holes in vertical directions it must add these supports because it can't print in the air. I found it to be best to print it in this direction.

All support removed and glued together the cracks between the layers. Fits perfect, maybe a bit fragile but it's well protected in this area.

With the Raspberry installed and the Power USB-C cable connected, the black cable at lower right.

I placed the 12 to 8 Volts DC/DC converter behind the guide camera. It's an analog regulator, but only power the Canon camera and focus motor. No continuous power but peaks of 2 Amp at 8 Volts.