Here is my latest creation. As usual it is pretty much useless, but I had a lot of fun designing it and seeing it in real life.
As you may know I have been working in satellites activities and spent most of my pro life into Low Earth Orbite satellites. So here is a moke up of a ground station antenna, able to track any LEO sat you want.
The antenna is 3D printed from a design I made starting with a 6 meter dish antenna picture.
The dish is now 20cm wide, has a real paraboloid shape and is moved by two stepper motors fully hidden into the pedestal of the antenna
the 3D models are available here
Two hall effect sensors and two magnets allow to setup the antenna horizontal and pointing to north at boot time. They are also hidden into the structure.
An ESP32 is also hidden in the basement and is the heart of the system. It computes the position of the satellites every 1ms and computes the azimuth and elevation angles from your antenna to the satellite.
A B4X App allows to visualize the track and to send parameters to the antenna : which satellites to follow, the Two Lines Elements and the time.
The orbit propagator is embeded in the ESP32 and uses the excellent SGP4 library ported by hopperpop
the firmware was directly inspired by Alex Chang project
The App is quite simple with a single activity which mainly uses GoogleMap and GooglemapsExtra libraries (thanks @Erel and @warwound )
Finally two video of a real ISS tracking in my home
One at 16x speed and one much longer but with explainations !