30 Days Lost in Space → Help Center

Circuits — 30 Days Lost in Space Help Center

Component guides, wiring references, code explanations and fixes for the errors people hit most in 30 Days Lost in Space.

Circuits

Circuit theory and patterns: wiring, schematics, and breadboards

• Breadboard Basics — How to use a solderless breadboard for prototyping circuits. Understand the internal connections, power rails, and best practices.
• I2C Communication — A two-wire protocol for connecting multiple devices. Use I2C to talk to OLED displays, sensors, and other peripherals on a shared bus.
• Ohm's Law — What Ohm's law actually says, in plain language — and how it decides every resistor value in your kit. Worked through on the exact LED circuit from Day 2.
• Series vs Parallel Circuits — Two fundamental ways to connect components. Series circuits share current; parallel circuits share voltage. Each has different effects.
• Shift Register: Pin Expansion — Control 8+ outputs using only 3 Arduino pins. Shift registers expand your I/O capacity for LED arrays and multi-digit displays.
• Voltage Dividers — Split a voltage into a smaller voltage using two resistors. Essential for reading sensors and level-shifting signals.