You don't even need sensors. STMicroelectronics has a TRNG block [1] that "passes" NIST SP 800-22 statistical analysis [2]. I used quotes because the 800-22 is an analysis test suite and the notion of passing is based on your hypothesis parameters, but the suite itself is considered the de-facto analysis mechanism.
I don't follow where the confusion is coming from?
I don't follow where the confusion is coming from?
[1] https://www.st.com/resource/en/application_note/dm00073853-s...
[2] https://csrc.nist.gov/Projects/Random-Bit-Generation/Documen...