Albert Einstein He developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).

The first integrated circuit invented by the engeneer Jack S. Kilby1 (1923-2005) contained only a few transistors. Texas Instruments.

Full part list (WiFi YouTube subscribers counter)

7 segment module: LINK
Wemos D1 R2 mini: LINK
Buzzer: LINK
3D printed case (DIY)

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