SOLAR TRACKER

This machine can be used as a star tracker, solar tracker or I use as a mirror (get the right position to reflect the sun light inside my house).
I didn’t like to use a SD with text file with loaded all the coordinates of the sun, but Since at my engineering course I studied a lot about the sun, classic mechanics and about earth movements I rebuilt the equations with high accuracy 0.1% (it counts the reflection of the light with the atmosphere too).
I use the ESP8266 (WiFi module) to get the real time from internet and check the weather conditions.
If it rains I move the mirror to protect ( as additional roof) the case as much as possible from the water.
It uses internet to download wind strength and direction and if it is dangerous it puts the mirror in a “flag” position.
(a 30Km/h of wind can cause almost 50 N of forces and a high torque (15Nm in the worst case) with a 1m^2 of mirror).

I used this configuration with spring because I can raise significantly the load. With the right springs you can made a torque of 9 Nm with just only one nema 17.
In my case with a total spring of 750N/m and a load of 3Nm i have this result
(SEE THE MATLAB GRAPH BELOW)
As you can see in the graph, my motor has to do less than 1Nm of torque instead of 3Nm.

Gear--- I tried to use as mush as possible bi-helicoidal gear gears for better performace( less noise and less backlash),
The elevation gear has a ratio of 1:202, the azimuth gear-motor has a 48.22:1.
I used gears for the potentiometer too (2.33:1) to upgrade the improve the quality of readings.
Total cost of this machine:less than 80 Euros.

I will fix errors in the guide and upload sketches in the following days.

homing_test

lifting 1kg of pasta for calibrating motor's speed

TORQUE (Nm)

ANGLE(RAD)

Find in the table the best spring for you

ELEVATION GEARMOTOR

N° PASSAGE

5

GEAR RATIO

202:1

AZIMUTH GEARMOTOR

N° PASSAGE

4

GEAR RATIO

48.22:1

POTENTIOMETER GEARS

N° PASSAGE

1

GEAR RATIO

2.33:1

Those are the main aspect of the project and all the downloads link

for information, advice, questions

write to my email or just write in the chat box

not1996@hotmail.it

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