Six electronics experiments

Campaigns75–80: complete source programs, blank observation worksheets and editable original SVG/PNG diagrams. Host/model checks do not establish physical measurements or target execution.

1. 75 — SGP40: Raw Gas Counts Are Not Air Quality in ppm
2. 76 — MLX90614: A Valid Temperature Packet Can Still Miss the Target
3. 77 — ATtiny85 Die: Fair Mapping Is Not True Randomness
4. 78 — ESP32 Wi-Fi Loss: Retry Without Restarting the Experiment
5. 79 — UNO Knob Readings: Raw Ratio and Volts Answer Different Questions
6. 80 — Capacitor Discharge: Your Voltmeter Is Part of the Circuit