J3 Follower Line Robot v1.0
The Simplest Follower Line Robot — kidSerie#08
Hi, I will show you how to create a really cool robot! No chip, no code needed! just 3 components! and the robot will automatically follow the black line of gouache paint:)
Open your mind, Have a look around and I will walk you through each tiny detail.
Why would you want to do that?
These small wins can ignite joy engagement and creativity in your class!
or in your home…as I realized here at home!
Come and join us!
It is very simple!
It is the simplest robot ever constructed on Earth!
It is named? J3 Follower Line Robot!
The secret is extremely simple: LDR!
LDR or light-dependent resistor is a light-controlled variable resistor.
And here is a fritzing graph (you can download it all from my google drive):
Pretty simple, isn't it?
Here is a list of material needed:
2 X Motor
2 x Wheels
2 x TIP 120
2 X LDR 5mm - Light Dependent Resistor
2 x Super Bright 5mm LED
1 x Protoboard
2 x 100 Ohms resistors
1 x Styrofoam Feather Structure 12 X 18 Cm
1 x Roll-On, One of the best Deodorant ;)
1 x Hygienic Drinking Straw
1 x batteries holder (for 4 X AA)
1 x Breadboarding wires
Some tools, isolation tape, roll-on deodorant hot glue…
Here is how I cut the styrofoam to make the chassis.
To manufacture the structure use styrofoam paper.
You can easily find this on your local papers store supplier or you can use an alternative material, acrylic, wood, or plastic, you are the artist! I’d love to hear about your project:)
All these measures and procedures you will find on my video tutorial.
The tricky part of the project resides in soldering techniques.
Here I am sharing my work with you, so you can do the same thing right away!
The entire circuit step by step I present now in the video! Grab your cell & make your robot right now! It is the simplest robot on earth!
Pause the video while setting up your circuit. The steps are:
First, connect the positive and negative tracks.
Connect the two LEDs in the way shown in the schema above.
Use 100 ohms resistors to avoid high current on LEDs.
Close the circuit.
Now position the two TIP 120s in the manner shown on the schema. There are BCE — Base, collector, and emitter for the FET. Watch out! Check twice!
At the collector set the voltage to 6 volts (four batteries double A )
The two motors are connected to the emitter of each FET transistor.
Now the negative voltages of the motors.
Now send 6 volts for each motor.
Ops, do not forget to borrow your mother’s deodorant roll-on …one of the best Deodorants in the world…
It serves as the robot’s third wheel (the top, logically ).
I put Dry Graphite Lubricant in the rolling to make it work better. it’s a cool trick :)
Now follows the super important picture, relative to the parameters and distances of the components about the floor:
You can reuse the engine from your remote control car that no longer works
and is lying out on the kids’ toys shelves…!
Double the highway, giving room for two cars, and a race can be made!
That would be great fun, then …
create and have fun! there are a lot of possibilities!
Ready! Have fun with the world’s simplest robot!
So that’s it for this post/video!
I hope you enjoyed it, And I hope you found the project interesting
because it was quite a challenge to design, but I think it turned out pretty well.
On youtube don’t forget to hit that like button if you did enjoy it!
And if you haven’t already - consider subscribing because everyone who subscribes is a huge bonus for the channel, and keeps me doing these projects.
So thanks if you do subscribe.
Other than that, thank you anyway!
See you the next time. Bye!
Download All files for This Project
References & Credits
Como fazer um robô que dirige sozinho — YouTube
EEVblog #748 — How Do Transistors Work? — YouTube
Transistors & The End of Moore’s Law — YouTube
How do transistors work? — Explain that Stuff — Learn Engineering
Teste de Transistor do tipo MOSFET com multímetro digital — YouTube
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[published on Dez, 2017]
[updated on Jan 2018] — new images, schema, text review.
[Edited: Nov 2018 — Grammarly powered corrections]
[Edited: Feb 2024— Grammarly powered corrections again]
A consistent amount of minor success produces much more happiness than occasionally bagging an elephant…
