I am usin an Astroberry distribution to control my telescope.

I wanted to add some focusser so I did follow astroberry-diy to connect to my raspberry.

Then I tried to add some cooling to my camera following Cooling 120Mc.

As my current connection to the Raspeberry is made of plenty fo wires, I wanted to make it clean with a PCB and inprove the cooling control by putting the raspberry in the loop.

Thats a first revision of my project.

Not Yet Build.

In Work.

It includes (Still needs review) :

• 12V Power input for the raspberry.
• Driver for a step motor (Atroberry-DIY).
• Humidity + Temperature sensor (DHT22) for dew point calculation.
• 1 Wire Temperature sensor to measure the external temperature of a camera.
• PWM driver peltier for Camera coolig; Main issue tackeld = Get a stable PWM (6A Max) voltage to avoid peltier break.
  • https://oshwlab.com/Dipo/Peltier-PWM-Thermostat,
  • https://electronics.stackexchange.com/questions/118536/thermistor-control-of-peltier-voltage-with-arduino-for-dslr-chill-box-project,
  • https://www.youtube.com/watch?v=XSLIaLzFBW4
  • https://thedevnotebook.wordpress.com/2018/07/04/temperature-control-of-peltier-element-5-pwm-filter/
• Relay OnOff driver peltier for Camera coolig, that could be any 12V On/Off driver.
• RTC time. (Ref : https://oshwlab.com/arsimantur/ds3231-rtc-for-raspberry)

I plan to include:

• GPS module.
• Protection des sorties (Resetable fuse) : E.g. : ASMD2920-500-12V
• Improve MSFET outputs :
  
  • Use : 15A 400W MOSFET AOD4184A
  • Partial Ref : https://www.youtube.com/watch?v=tCJ2Q-CT6Q8