Every early summer there is still a balloon festival for children in my home town of Wallenhorst. The postcards at the end of the strings refer to the young addressees and ask for them to be returned in a dear, recently learned handwriting. At the beginning of each summer, I, too, said goodbye to a helium-filled, red balloon in the blue sky in childlike anticipation. I never got an answer.
Today I am still fascinated by the uncertainty of landing. The winds and gravity act on the light missile and open up a state for which humans have chosen a simple word: chance.
Where will my balloon land?
arduino, relais [high 5000ms, low 700ms]
red balloon filled with air