PARTS LIST :-

• Camera :- ZWO ASI 178MC USB 3.0 Colour Camera
• Lens :- All Sky Lens for QHY5-II and 1/2 Inch Camera
• Dome :- 3.5" Clear Acrylic CCTV Dome
• Case :- 3D Printed
• Case Sealant :- Gorilla Versatile Mould-Resistant Sealant, Clear
• Desiccant :- Dry & Dry 10 Gram [25 Packets] Premium Silica Gel Orange Indicating(Orange to Dark Green) Silica Gel Packets Desiccant
• Dew Heater :- Dew Heater Module - All Sky Camera
• Peltier TEC :- Peltier Module, 54.6W, 4.4A, 20V, 40 x 40mm
• Waterblock :- CPU Water Cooling Block, Waterblock Liquid Cooler 50mm Copper Base for Intel/AMD
• Coolant :- XSPC XS-EC6-CL Non Conductive Coolant - Clear
• Radiator :- BQLZR 80 Row PC CPU CO2 Water Cool System Heat Exchanger Radiator
• Fan :- Coolink SWiF2-800 Fan 80 x 80 x 25 cm
• Water Pump :- Decdeal Mini Brushless Water Pump DC12V 5W Ultra-quiet Waterproof Submersible Fountain Aquarium Circulating 280L/H Lift 300cm
• Computer :- Raspberry Pi 3 Model B+
• MicroSD card :- SanDisk Ultra 16GB microSDHC Memory Card + SD Adapter with A1 App Performance up to 98MB/s, Class 10, U1
• HAT :- DIY Proto HAT Shield for Raspberry Pi 3 and Raspberry Pi 2 Model B/B+ / A+ KB
• 5v PSU :- LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module

Circuit Diagrams :-

Cooling :-  The Peltier TEC is run continuously on a low level at about 5v to stop the camera overheating in the thermal insulation.  For night viewing, the TEC is run from the full supply of 13.8v switched by a GPIO pin on the RPi.  The J438 P-channel MOSFET is turned on via the EL8217 opto-coupler providing the full supply voltage to the TEC.

Dew Heater control :- In this case the dew heater is connected directly to the main supply and the return is switched by an N-channel MOSFET (IRLZ44N) to control it.  Again the power circuits are isolated from the delicate RPi data side with an opto-isolator.

Hi Gina

I'm looking at getting the dome you mention in your parts list and wondered whether you recommend it. I have purchased some cheapo ones before when I was messing around trying to build an ASC and they were very poor quality at least for this application, introduced way to much distortion.

Thanks

Very comprehensive list. What software are you running on the Pi to control the ZWO?

On 19/06/2020 at 10:40, silentrunning said:

Hi Gina

I'm looking at getting the dome you mention in your parts list and wondered whether you recommend it. I have purchased some cheapo ones before when I was messing around trying to build an ASC and they were very poor quality at least for this application, introduced way to much distortion.

Thanks

These domes produce negligible distortion.  I too have tried cheaper ones in the past and had that problem.

On 07/07/2020 at 16:54, Julessilver said:

Very comprehensive list. What software are you running on the Pi to control the ZWO?

INDI as in KStars/Ekos/INDI.  The Pi runs the indiserver and INDI drivers.