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Combine a Li-ion charger board and a boost converter into a rechargeable 5V–12V supply for all your breadboard projects. Intermediate~1

Red, yellow, green — in the right order, with the right timing. The friendliest possible introduction to digital outputs and

Learn how 7-segment displays really work by driving one raw — one button counts up, the other resets to zero.

A little fan that spins up only when things get hot — and spins faster the hotter it gets. Great

A lamp that switches itself on when the room gets dark and off again at dawn — the humble LDR

Build a 2.4GHz radio link between two Arduinos: a joystick transmitter on one end, and a receiver that follows your

Point the sound sensor at your speaker and watch an RGB LED pulse and change colour with every beat. Beginner~45

Type the right PIN on a 4×4 keypad and a servo swings the latch open; get it wrong three times

Move two servos smoothly with a thumb joystick — the exact mechanism behind camera gimbals, robot heads and sensor turrets.

Log temperature readings to a CSV file on an SD card, each stamped with the exact date and time —