Final project: build your own AI helper

Introduction

You can now make a computer see motion, faces, expressions, bodies, hands, objects and words. You've trained your own model and made AI switch on a real light. Time to put it all together and invent something of your own: an AI helper that solves a real problem or makes people smile.

a facea hand signan object

speaka lighta sprite

Your recipe: when the camera sees a hand sign, the hand pose model decides, and the helper Arduino turns on a light. Every AI project is these three steps: sense, think, act.

Working principle

Every great project follows the same steps, the way real engineers work:

1. Problem: what will your helper do, and who is it for?
2. Plan: fill in the see → think → act steps.
3. Build: start with the smallest version that works, then add to it.
4. Test: try it with different people and conditions (remember the fairness test!).
5. Improve: fix what didn't work.
6. Show: present it to your family or class.

What you'll need

• PictoBlox with whichever extensions your idea needs
• A webcam
• Optional: an Arduino, LEDs, a buzzer or a servo motor
• A notebook for your plan

Working in real life

Step 1: pick an idea. Use one of these, or invent your own:

Idea	See	Think	Act
Study buddy	Your face	Are you looking at the screen, or away for too long?	Tobi reminds you to focus
Clean-up game	Objects on your desk	Is there a cup, bottle or book left out?	A score goes up for each thing you tidy away
Exercise coach	Your body pose	Did your hands go above your head?	Counts your jumping jacks out loud
Mood lamp	Your face	Happy, sad or surprised?	An Arduino LED changes colour
Sign-language helper	Your hand	Which sign is it? (train your own model)	Tobi says the word
Recycling sorter	An item held up to the camera	Paper, plastic or metal? (train your own model)	Tells you which bin to use

Step 2: write your plan. On one page, write: the name of your helper, who it helps, its see → think → act steps, which extensions you'll use, and how you will test it.

Step 3: build the smallest version. Get just the "see" and "think" part working first. Make Tobi say what the AI sees. Then add the "act" part.

Step 4: test and improve. Ask three people to try it. Write down what went wrong and fix one thing at a time.

Step 5: show it off. Give a two-minute demo: what problem it solves, a live demo, and one thing you'd improve next.

Try it

When your project works, add one extra challenge:

• Add sound effects and a title screen.
• Add a real-world part with an Arduino.
• Make it work for two people at once.
• Make it fairer: test it in a dim room and with someone wearing glasses, and fix what fails.

Check what you learnt

1. What should you build first?

   The smallest version that worksThe title screen and musicEverything at once

2. Your exercise coach miscounts when your friend tries it. What's the best next step?

   Give upTest it with more people, find what goes wrong, and fix one thing at a timeOnly let yourself use it

3. Which part of 'see, think, act' is an LED changing colour?

   SeeThinkAct

Conclusion

• Real projects follow the same steps: problem, plan, build, test, improve, show.
• Start small, get it working, then add more.
• You're now an AI maker: you can make computers see, think and act!

What next?

Want to go further? When you're older, try the AI & Computer Vision course, where you'll build the same kinds of projects in Python with OpenCV and YOLO. Until then, keep inventing!