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Source : Thingiverse ( STL)
Here you have a small robot I have done for a special holiday course for children.
In 6 week, 2h/week they have finish all the robot
The cost is around 20$ per robot of material
They can modify the top with tinkercad
they can start programming with blocklyduino or S4A and then switch to arduino IDE.
You have :
an arduino nano
motor driver (L9110S dual H bridge)
9V battery holder clip
ultrasonic sensor (HC-SR04)
2 DC motors with wheels
some cables (dupont line male/male or/and male/female)
a remote control kit with receiver module
and some cable ties, 9v batteries and other small part (condensateurs, switches,...)
Public CAD source :
To connect and program you have some example on github
Added schematics and new links