Maths
How to solve simultaneous equations: chickens and rabbits
Simultaneous equations are two equations that are true at the same time. To solve them by elimination, make the number in front of one let...
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System Design
Event-Driven Architecture Explained With a Python Example
Event-driven architecture is a way of building software where a part of the system announces what just happened, such as "order place...
Builds
AND gate and OR gate using transistors: build both
To make an AND gate using transistors (switches flipped by electricity), put two in a row. Current must pass through both, so an LED wired...
Explains
Switch debouncing explained: why one press can count as 7
Switch debouncing turns one bouncy button press back into one count. A button's contacts are springy metal, so they hit, bounce apart...