Random, from radioactive decay
A Geiger counter, a Raspberry Pi, and a simple comparison. Each click is an atom decaying. The Pi times the gap between two clicks, then the next gap. If the first gap is shorter, the bit is a one. If the second is shorter, it is a zero. Equal gaps are thrown away.
No formula makes up a number here. Comparing two gaps cancels out any lean in the hardware by itself, with no correction applied afterwards. That is why the raw stream is worth measuring at all. Everything below is that measurement, taken around the clock and never smoothed.
The same bits, drawn: the entropy views live on tinymachines.ai, beside the instrument itself.
The source
Asking the Geiger box.