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We love LEGO and we also love Crazy Circuits so we wanted to combine the two into a simple and fun robot that can avoid running into walls and other objects. We’ll show you how we built ours, and outline the basics needed so you can build your own. Your version might not match ours exactly, and that’s okay.
Below is a list of the Electronic Parts we used, and a list of the LEGO Parts we used. Your parts may vary, so don’t be afraid to do your own thing.
Supplies:Electronic Parts:
1 x Crazy Circuits Robotics Board
2 x LEGO Compatible Continuous Rotation 360 Degree Servo

1 x HC-SR04 Ultrasonic Distance Sensor
4 x Dupont Female to Female Wires
1 x USB Power Bank
(We found a small USB Power Bank that fit into our robot nicely. You may need to design your robot to fit the USB Power Bank you have on hand, or you can also use a your own battery pack.)
LEGO Parts:
We used a variety of parts but you should feel free to build yours however you see fit, using whatever LEGO parts you have on-hand. The important things youll need to do is have a way to mount the servos on the bottom, the ultrasonic sensor so it can point to the front, and some way to hold the Robotics Board and power source in place. In a pinch you can use some tape or rubber bands to mount things where needed. We have provided links to each part on BrickOwl but you can find them anywhere LEGO or LEGO-compatible parts are sold.
2 x LEGO Wedge Belt Wheel (4185 / 49750)
1 x LEGO EV3 Technic Ball Pivots Set 5003245
1 x LEGO Technic Cross Block Beam 3 with Four Pins (48989 / 65489)
1 x LEGO Technic Brick 1 x 6 with Holes (3894)
2 x LEGO Axle 4 with End Stop (87083)
4 x LEGO Half Bushing (32123 / 42136)
4 x LEGO Brick 2 x 2 Round (3941 / 6143)
1 x LEGO Plate 6 x 12 (3028)”

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