Solar Voltage Meter
Measure voltage levels with an LED bar graph display
Watch the circuit build itself: components drop in, wires connect, and the output comes alive.
Components
Everything you need for this project.
2x 10KΩ resistors
4x LEDs (1 red, 1 yellow, 2 green)
4x 220Ω resistors
1x Potentiometer
8x jumper wires
How It Works
Voltage dividers for measurement, ADC scaling and calibration, multi-LED bar graph display, and voltage range mapping.
What You Build
Voltage divider from potentiometer to A1. Four LEDs on D1–D4 form a bar graph representing solar panel voltage levels.
African Context
Solar energy adoption is accelerating across Africa. Technicians need to measure panel output voltage, and this circuit teaches the fundamental measurement technique.
What You'll See
Turning the potentiometer fills the LED bar graph progressively. Display shows calculated voltage and digital bar graph.