Note: this batch was thin — most candidates were Shorts, hashtag-spam clickbait, factory promos, or a Satisfactory gameplay video. This Arduino voltmeter tutorial is the least-bad pick that actually teaches something concrete.

The video walks through building a 0–50V DC voltmeter using an Arduino and an SH1106 OLED display. Even at the hobby level, this project touches on a handful of genuinely useful electronics fundamentals worth understanding:

The core concept is a resistor voltage divider on the Arduino's analog input. The ATmega's ADC tops out at 5V (or 3.3V on some boards), so to read up to 50V you need to scale the input down by roughly 10:1 with a precision resistor pair. Picking those resistor values involves tradeoffs between input impedance (too low wastes current and loads the source), ADC source impedance limits (too high and the sample-and-hold capacitor can't charge in time), and power dissipation at the top of the measurement range.

A good build also covers ADC reference selection (using the internal 1.1V reference for better resolution), calibration against a known source, and driving the SH1106 over I2C — a slightly fussier OLED controller than the more common SSD1306.

For someone new to Arduino sensing projects, it's a compact introduction to analog input scaling that scales up to building current shunts, thermistor readers, or basic data loggers.