Keyestudio Electronic Parts DIY Kit For OTTO Robot Maker

KS0358 OTTO 机器人DIY套件 (1)

1.What is Otto DIY ?

Otto is an interactive robot that anyone can make! It is completely open source, Arduino compatible and 3D printable.

Otto is able to walk, dance, make sounds and avoid obstacles. His small body is in the assembled size, with simple structure. The shelf parts are designed using 3D printer, simple electronics connections (almost no welding required), and basic coding skills.

Otto is designed using Autodesk 123D Design software. No need technical knowledge, perfect for beginners. You are able to modify it or even recreate them to make you own Otto robot and then share to the world!

2.Kit List

The kit includes everything you need to build your Otto in 1 hour:


Note: the print parts are Not Included!






NANO Shield



Keyestudio Nano CH340



HC-SR04 Ultrasound Sensor



HC-06 Bluetooth Module



Micro Servo 9G



Passive Buzzer



Phillips Screwdriver



200mm Black Connector Wire



USB Cable



200mm Red Connector Wire



Female to Female Jumper Wire



Self-locking Push Switch



M2*12MM Round-head Screw



M2 Nut



M2X5MM Tapping Screw



4 AA Battery Case with lead


3.3D Printing Parts

And then you only need to 3D print 6 parts in total:

  • 3D printed head

  • 3D printed body

  • 3D printed leg x2

  • 3D printed right foot

  • 3D printed left foot

For the 3D printing parts, you can print them out with 3D printer.

That’s all simple! Download all .stl files here in Thingiverse. If you do not have a 3d printer, you can always use services like or local maker spaces.

5.Build Your Own Otto Robot:

all parts Step1: Check Your Parts From Bottom to Top

Print the attached .pdf instructions manual for convenience:


Step2: Foot Servos Assembly

OTTO step 1

Put the micro servo inside feet and then push it inside, if is to hard maybe need to clean more the area with a cutter.

Is very important to check that the servo is able to rotate at 180 degrees to each side.

After checking the movement, use only the small screw to fix it.

Same process for the other foot.

OTTO step 2OTTO step2

OTTO step 3

Step3: Fix Servos to Body

Take the other 2 micro servos put them in the defined locations in the 3D printed body, and fix them only with screws.

Step4: Fix Legs to Body

OTTO step 4

Connect the legs to the hub of the micro servo, important like the foot servos, you must check the legs are able to rotate 180 degrees each side respect to the body.

After verifying the alignment, fix them using the small screws to the hole inside the leg.

Step5: Fix Foot to Legs

OTTO step 5

Taking care of the cables as showed in the illustration, you should put the cables inside the slots of the body passing through the hole of the legs.

Once they are in right position, use the pointed screws to fix them from the back.

Step6: Head Assembly


Start from the ultrasound sensor is important to pull out the eyes to the limit. Then put the Arduino nano in the shield, optionally you can weld the positive cable of battery holder to Vin in the board and negative cable to any GND.

Insert diagonally the both boards together facing the USB conector to the hole in the 3D printed head, then use the pointed screws to fix it.

Step7: Electric Connection

Prepare the jumper cables, buzzer, and switch.

Then follow the diagram pins numbers and make sure to put them in the right position.

OTTO step 8

OTTO step 9


Special note:

  1. When connecting the Bluetooth module, CANNOT directly plug into the shield. Or else, the space is not enough, should connect the Bluetooth module to the shield with male-to-female jumper wires. The jumper wires are Not Included in the kit list.

  2. When connecting well all the components and uploading the code, CANNOT press the button welded to battery case, that is, CANNOT supply the power; otherwise, code upload fails.

Step8: Snap the Head

The Head has snap feature, take care of the cables and close it. Congrats!

OTTO step 11


Step9: Arduino Programming

For the coding part you will need to:

  1. Download and install Arduino softwareIDE:

  1. Copy all libraries to C:/Users/user/Documents/Arduino/libraries (or wherever your library folder is installed)

  2. Connect your Otto through USB (your computer should install the drivers)

  3. Finally open OTTO_smooth_criminal.ino code and upload to your Arduino Nano for dancing Otto mode.

  4. Try OTTO_avoid.ino for obstacle avoidance

More codes in

You can always try different codes from the same Github repository to use the ultrasound to avoid obstacles or detect objects and the buzzer to make sounds. Include all main moves very easy to adjust speed, number of times and direction.


Special note:

This OTTO kit is similar to Keyestudio Frog Robot for Arduino Graphical Programming kit(KS0446).

This OTTO kit contains a HC-06 Bluetooth module, using Bluetooth 2.0, only compatible with Android phone. But frog robot kit contains a HM-10 Bluetooth module, compatible with both Android and iOS phone.

When using, as long as the Bluetooth module is not involved, these two product kits can use the common source code.

Check relevant info of frog robot kit from the link:


Otto website:

Tutorial from:

Otto Instructions Manual and Otto DIY-AllFiles:

More Codes from: