# ZippyTheBalancingRobot
[![ZIPPY_VIDEO](https://img.youtube.com/vi/0io5SwitLzY/0.jpg)](https://www.youtube.com/watch?v=0io5SwitLzY)
(Click on image above for link to YouTube video)
Zippy 2.0 is a 3D printed Arduino Nano based balancing robot with a custom PCB. The original prototype version was put together on a breadboard with lots of jumper wires. This is certainly a great way to get started. The STMicroelectronics 8A motor drivers do not come in a convenient package for breadboarding, but ST does provide evaluation boards which work well with a prototype system.
The frame can be printed in multiple colors by pausing the print at the right height and switching filament. The SketchUp 2017 file is included for design customization. The frame is put together with a few dozen M3x10mm bolts and hex nuts, and four M3 standoffs for the PCB. I printed the frame in PLA with a 0.2mm layer height and 40% infill. See more information on the 3D printed frame on [Thingiverse](http://www.thingiverse.com/thing:2291516).
I've also included an optional set of bumpers, which can protect Zippy in the event of a fall. Wrap the bumpers with pipe insulation tubes for a little extra cushion. Yes, the bumpers detract from Zippy's graceful physique, but make Zippy a little more rugged for kids.
The PCB yields a more compact design than a hand-soldered protoboard, but does require some SMD work and an additional outlay for PCB manufacture. Even with the fine 0.5 mm pitch, the drivers can be hand soldered to the board (I did!) with a steady hand and patience. There are plenty of YouTube videos on how to do this.
Here are the important parts for Zippy:
* 2 x VNH5180A motor drivers ($3.72 each as SMD parts, or $8.69 each as evaluation boards from Mouser)
* (Optional) Zippy printed circuit board (see Eagle files) $17.60 from EasyEDA or other PCB maufacturers
* 2 x 30:1 Metal Gearmotor 37Dx68L mm with 64 CPR Encoder ($39.95 each from Pololu)
* GY-521 MPU-6050 gyro/accelerometer breakout board ($4.78 from Amazon)
* Arduino Nano ($2.99 clone from Banggood)
* ZIPPY Flightmax 3000mAh 3S 20C LiPo battery ($22.49 from Amazon)
* 16x2 character LCD display ($5.99 from Amazon)
* Remote control with PWM receiver
* Two Schottky diodes (I used Fairchild SB1245 12A diodes, $1.57 each from Mouser)
* Various resistors, capacitors, 10K trimpot, pushbutton, connectors (see schematic)
I've also included a schematic in the Eagle folder. Gerber files are provided in the Eagle folder if ordering from a PCB manufacturer. Otherwise, use a breadboard and wire according to the enclosed schematic.
Pay close attention to polarity on motor wheels (swapping motor leads as necessary) and MPU-6050 orientation. The software assumes the gyro/accelerometer is mounted with the +X axis facing the front of the robot.
Depending on your robot inertia, the PID gains may need to be retuned. Increase as needed to achieve crisp response without any oscillation.
Also, if you like the colored eyes in [Zippy's video](https://www.youtube.com/watch?v=0io5SwitLzY), I've included the source code for that too. You need another Arduino Nano or Pro Mini, two RGB LEDs (I used common anode), and six 300 ohm resistors. The code shows which pins I used. I just soldered the wires directly to the board, which is attached behind the face plate. I can control the color, or have a changing rainbow pattern, using my remote control. I used the left throttle stick on my RC remote.
Here are a few photos:
<img src="/images/20170430-0002.jpg" alt="Zippy Front" width="350"> <img src="/images/20170430-0001.jpg" alt="Zippy Back" width="350">
<img src="/images/IMG_1352.jpg" alt="PCB" width="350"> <img src="/images/IMG_1372.JPG" alt="Bumpers" width="350">
And a few photos of the prototype V1.0 version:
<img src="/images/IMG_1361.JPG" alt="Zippy 1.0 Front" width="350"> <img src="/images/IMG_1362.JPG" alt="Zippy 1.0 Back" width="350">
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3D打印的平衡机器人_Eagle_下载.zip
共24个文件
stl:8个
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ino:2个
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3D打印的平衡机器人_Eagle_下载.zip (24个子文件)
ZippyTheBalancingRobot-master
ZippyTheBalancingRobot.ino 20KB
LICENSE 34KB
3D Printed Frame
Zippy.skp 1.1MB
ZippyFace.stl 275KB
ZippyTopPlate.stl 365KB
RightBumper.stl 468KB
LeftBumper.stl 465KB
ZippyLid.stl 456KB
ZippyMotorMount.stl 507KB
ZippyBack.stl 291KB
ZippySide.stl 528KB
images
IMG_1362.JPG 57KB
20170430-0002.jpg 68KB
20170430-0001.jpg 69KB
IMG_1361.JPG 55KB
IMG_1352.jpg 52KB
IMG_1356.jpg 38KB
IMG_1372.JPG 44KB
README.md 4KB
ZippyEyes
ZippyEyes.ino 2KB
Eagle
ZippyTheBalancingRobot.brd 152KB
ZippyTheBalancingRobot.sch 791KB
zippy_gerber.zip 84KB
ZippySchematic.pdf 89KB
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