the ladder · rung 9 of 10

Level 9 · Robotics

Wheels + everything so far = robot.

A robot is just every previous level, taped to a chassis. Sensors from L3 and L8, a brain from L7, and now two gear motors driven safely through an L293D — enough to follow a line drawn on paper.

New in the box

Motor driver (L293D) — Lets your small brain safely boss around big hungry motors.
Gear motors + wheels (pair) — Slow, strong spin — the legs of every robot you will build.

with everything through L9, your box now holds 27 component types.

Projects at Level 9

No Level 9 projects yet. The new parts above are catalogued and reviewed; the projects that use them are still being drafted and breadboarded. In the meantime, everything from the earlier levels still works — pick one below.

Earlier projects you can still build

Every project at Levels 1–9 draws on the components you now own — earlier projects never stop being useful. With the full L9 box you can tackle any of these 43 projects:

🔦 First Light · 📡 Morse Code Messenger · 🎈 Twin Reds · 🚦 Tabletop Traffic Light · 🔐 The Vault · 🚪 Do Not Disturb Sign · 🤝 Handhold Chain · 🚪 Two-Door Signal · 🚨 Signal Light · 🛟 Escape Hatch · 🧪 The Brightness Lab · 🔔 Door Buzzer · 🎛️ Dial-a-Brightness · 📻 Dial-a-Buzz · 🔧 Continuity Tester · 🚨 Panic Doorbell · 🔈 Whisper Alarm · 🛎️ Two-Tone Doorbell · 🚨 Arm & Ring · 🔔 Twin Bells · 🖐️ Two-Hand Bell · 🔕 Silent Alarm · 🎮 Quiz Buzzer · 🌙 Automatic Night Light · 🌅 Sunrise Alarm · 🍪 Cookie Jar Alarm · 🪤 Trip Wire Alarm · 🌡️ Warm Hand Alarm · 📖 Reading Light · 🏝️ Vacation Nightlight · 📚 Study Lamp · 🌆 Curfew Beeper · 🤒 Fever Beeper · 🌇 Dusk Chorus · 🎺 Warm Hand Chorus · 🌀 First Spin · 💨 Handheld Fan · 🌞 Sunrise Fan · 🆘 Panic Fan · 🎉 Party Spinner · 🚗 Twin Wheels · 🎚️ Dial-a-Spin · 🕸️ Trip Wire Fan