Pittsburgh, PA, USA | info@petoi.com 

© 2018 Petoi LLC

Apr 28

Missing part / extra part


I received my kits this week and am in the midst of putting my first kitten together!


I am missing an inner thigh (thigh2 -the one with laser cutouts for servo arm and spring i.e. NOT the one with "Petoi" etched on it.). My kit had some loose wood parts held in place with tape and I guess who ever did that didn't notice the wrong half was included. If you could send that in a regular mail envelope that's fine. I have the whole byte so I am using the correct part from the other kit to keep going. Send me a mailing address and I will send back the extra outer thigh I have.


Many thanks!


ID #265

Sorry for that accident. Could you take pictures of the pieces you have (5 x thigh1+ 3 x thigh2) and the hand-written number on the packaging box? Send them to info@petoi.com.


I'll mail the missing piece on Monday. You don't need to mail the extra pieces back.

Apr 30

I appear to be missing the plastic screws with my kit. I'm still cataloging the pieces.


Is there a single parts list somewhere? I'd like to use it to determine if any other parts are missing.


Also, I don't have a hand written number on the shipping box.


What's the process to obtain missing parts?





You can find example kit contents on the second page of the instruction document. There's no "plastic" screws in the kit.

Could you take a picture of everything on table? And mark the part you think is missing on the picture.

The handwritten mark maybe covered by tapes or shipping labels. For the first dozen of kits we don't have the mark. It's for later tracking of operators on each package.


May 12

Same problems of parts missing ... rubber bands are very thin and going to tear while mounting to legs :-( ... 3 of 4 now defect.

the screw for neck servo with spring is a mess ... too short ... spring cut off but :-(

May 12Edited: May 12

What are your missing parts? The thighs? Please take a picture of your kit contents and the handwritten marks outside your package.


I included 5 rubber bands in the kit and should be handled carefully. I can ship you more rubber bands for practicing with the missing parts. They are optional for Nybble to walk. You can also use hot glue on the feet to replace rubber bands.

The screw for neck servo is not too short. Check this video showing how it works. No need to cut off the spring!


New Posts
  • With writeinstinct.ino sketch loaded I calibrated joints, updated instincts, and calibrated the MPU6050 with no problems. When entering commands into the serial monitor all positions work and run great; sit, walk, rest and kbalance stands level with head and tail straight. The problem accrues after loading the main Nybble.ino sketch. Nybble works great with the remote control but on the balance command the body of Nybble leans to the right, the tail moves to the right of center and the head tilts down and to the right. The walking goes to the right quite a bit when testing with writeinstinct.ino loaded. The other positions look "true" when sitting, pushups, rest, butt up etc.. Also with Nybble in balance/standing position when pushing and or tilting Nybble to the right or left the right side goes over very easily while the left side has a more notable resistance when pushing over. It falls/leans easier to the right side and never will fall over to the left side. Front and back tilt work good with legs moving into the underbody position. No amount of calibrating the MPU6050 or servo angle adjustment has corrected this behavior. I have calibrated more than several times, even switched servos leg assemblies, looking for a really weak servo(s), to the other side but with no better results. I noticed when running the calibration for the MPU6050 in the serial monitor waiting for the "6 numbers", it has more than once brought up only 5 lines of numbers on the completed MPU test and the test at times took over 25 lines of numbers printed out in the serial monitor before the MPU testing was finished. ( lines of numbers like this; " -1390 2206 999 100 -8 8 " ) Is it possible that the MPU6050 gyro/accelerometer is failing ?? The NyBoard Version is V0_1 mounted servo wires side down with the FTDI connector to the rear of the cat and have been using 2 sets of EBL 14500 fully charge batteries. I have not modified the NyBoard to "Pro Version" as like on the forums. So far its been fun, Thank You for the great kit Rongzhong & Team Members! Any help would be greatly appreciated !
  • Hello, is it possible that i have somehow flipped left/right position on sensor ? When i lean nybble to left it is not trying to compensate but moving even more left. Same for right. Front and back lean work as expected. Second question - is it normal that servo are moving with little delay after each few degree of movement - mean movement is not smooth but with delay intervals in it. Is it by purpose ? Is there any way how to fix / change it ? For example higher quality servos ? thanks
  • Hello, i have an issue with calibration. I have new kit with v2 board, original servos. Batteries are ok, measured and fine but i did try external laboratory power supply as well but without luck. First, i did basic calibration with "c" on serial console and set basic leg angle as on following picture: Them i start to calibrate using command "c8 number" to do fine tuning. Servo 8 and 9 are acting weird, when i send "c8 0" several times ( mean i will send same command over and over ) servo move to random position: This is happening only to servo 8 and 9. Servo 10 and 11 works fine mean command c10 0 will not move servo at all and c10 1 will move it little bit. Multiple same commands are working fine too. Next weird is when i reset serial connection akka restart main board and send command "c" for basic calibration position all legs move to correct position. Any suggestion before i will start some deep debug action ? :) Thanks