Yep, the surface friction has a big impact. You can see at Gero's experiments with changing movement settings here: https://www.petoi.com/forum/basic-assembly-and-setup/movement-issues-with-attached-bittle-socks

try aligning the legs with this tool via OpenCat: with a bit of patience it is possible to have it perfect and it makes a difference in the robot movement

yes, remove the rubber "socks"

@Rongzhong you prepared instructions as they should be. Didn't you notice that majority of posts here are due not reading it? 😂

@Robert Bolling step by step, did you upload WriteInstinct and calibrated by sending YYY command via serial monitor? Can you paste the whole console output in red when you upload WriteInstinct?

@Dave Bullock don't forget that RZ also gave us an option to move center of gravity by design. Just move your battery: or even put battery other way around, the thinner part in the front

@go pan Can you move whole OpenCat directory to Arduino folder to see if it helps?

@Infinite Hunter I'm not sure where the error comes from as it more looks like compilation message than serial monitor one. But start from uploading WriteInstinct to calibrate MPU6050. Try that as your first sketch. And don't forget to set serial monitor to "no line ending"

@Infinite Hunter can you share what worked so far? Like uploading writeinstinct etc. I mean at what stage of instructions are you stuck?

@Matthew Vasquez just in case you were wondering what section D_C_E is refering to: 4.2.1, last paragraph

@Ben Good news! To check if you have proper drivers for the board please see in Device Manager. See if you get anything like CH340 when you connect USB cable with programmer attached (programmer to Bittle connection not required) If not then install driver from: https://translate.google.com/translate?sl=auto&tl=en&u=http://www.wch.cn/download/CH341SER_EXE.html

Hi @Ben so let's do it step by step. Something is wrong with the content of MPU6050 library folder (C:\Users\SOL_K\Documents\Arduino\libraries\MPU6050). It should contain those files: Seems like you have there something else. Can you remove the folder and carefully add it one more time? Here is the steps in 4.2.2: https://bittle.petoi.com/4-configuration Just to clarify, after completing instruction 4.2.2 you should have MPU6050 folder as above and the \Arduino\libraries\I2Cdev folder like this: Try this and then we can tackle connectivity issue

All clear! Thank you! You took time to make it look pro, for sure I'm stealing the idea

@Rowan this black Pi support, what is it? Did you 3D print it?

@Ben PartiSi put your OpenCat folder inside arduino folder (C:\Users\SOL_K\Documents\Arduino) and rename the folder from "OpenCat-main" to "OpenCat". You want to have a situation similar as below: What do you mean by arduino IDE does not see the port? When you connect USB do you have this?

@Devesh Kaloty you don't need to edit any file as long as whole OpenCat fits into board memory. When you uploaded OpenCat were you able to give commands via serial monitor as explained here 7 Play with Bittle?

@Ben PartiSi there may be few reasons for this usually caused by not following instructions 😈. Can you paste the error like RZ is suggesting? WriteInstinct is the base of Bittle and Nybble and without it you will not be able to run OpenCat

Looks very neat! Tagging this post so I can get back when connecting RPi. Thanks for sharing

@Devesh Kaloty see also this post Cannot calibrate with remote, EQ does nothing

@John Gallaugher You really don't need to, just work on them them for a while before installation (squeeze and extend to make them more "plastic"). Look: