I don't know any local hobby shops in India. I live in Sweden :) But the wheel size and type is not very critical. Buy what you can get, and it will probably work. Try to look at shops that sell RC planes, or maybe RC cars.

@@AxelsDIY Sure I will look for it and sir I also didn't get the NEMA 14 stepper motor, which other motor I can use instead of the NEMA 14 stepper motor.

@@dhairyapatel9324 Maybe you can use NEMA 17 instead? The most common size used in 3D printers. They won't fit my 3D printed parts, but I am sure you can Improvise together something.

@@AxelsDIY ya sure thank you for the help 🥂

I do think it is harder to make a balancing robot that is both fast and very stable, but it can definitely be done. Keep in mind also, that a made this over 5 years ago. It's not very optimized either. I have made better balancing bots after this version also.

Hard to say. But the LED should be flashing if the main-loop in the code is running. Maybe you have not programmed it successfully, or there is some kind of reset-problem with your processor/board.

Handy did you ever resolve your issue?

My robot calibrates the gyro when switched on. It assumes that it is not moving, and saves the reading from the sensor. I have found that it is necessary since the readings from the gyro are dependant on ambient temperature. I don't calibrate the accelerometers at all, I just assume that the MPU6050 board is mounted flat.

Check my website here: axelsdiy.brinkeby.se/?page_id=1447 Scroll down a bit to the part about control theory for information on how I tuned it. Also, make sure that the center of gravity is in the right place, if the robot is very fornt heavy it will need to move a large dirstance forward before it comes to a stop, even when perfectly tuned

"avoid a top heavy design" ? The the heavy part, the batteries, are already on top. What did you mean.

He means no weight on top of the robot. So move the batteries. This will give a more stable robot and it will not 'stress' that much anymore.

I think you will find that these robots are made top heavy on purpose. Try it yourself. Take a light bamboo stick and balance it on your hand stretched in front of you. Now attach a heavy piece of wood or plastic on one side but a few centimeters away from the end. Compare balancing the stick with the wood near the top with balancing it with the wood near the bottom.

Top-heavy is easier for the control algorithm. Although the inertia of the robot is indeed larger, and thus require more load from the motor, it gives the robot more timespan to execute it's control objective. Avoiding top heavy is only important for car that are inherently stable (due to their four wheels)...

@@dozog I feel a bit smug because I worked this out for myself before seeing this. Could it be simply explained that it reduces the resonant frequency of the structure, which in turn requires a slower rate of error commands? [Brn] Sorry only just read your post, which seems to confirm this.

MPU-6050. Read more about it on my website, link in the video description.

The robot can balance for about 20 minutes on one charge. But that battery is very old, it probably has more like 400 mAh in actual usable capacity.

Stepper motors. NEMA 14 size.

No. I have not implemented remote control. It can probably be done by adding some kind of radio/WiFi module and a few lines of code tough...

Do you mean the cost? Since I have my own homebuilt 3D printer, and all the parts are very small and lightweight, it is very cheap. About 1 or 2 dollars for all the parts. If you mean the time: it took me about 5 to 10 hours to design all the parts and maybe around 20 hours to print them.

Thanks :) i'd like to make a project based on yours, Can I use different motor aside from NEMA 14 stepper motors?

Yes. You can use the more common NEMA 17 or any other stepper motor size you like. You will need to experiment and find other PID-parameters in the code to make your robot balance steadily. The PID values depend a lot on the size and weight distribution of the robot.

Glad to hear that. I'm just a beginner, how can I have a faster way on knowing this PID parameters?

You need to experiment. I don't have a good guide on how to tune PID controllers, but I am sure you can find that if you search around. it is just a matter of trial and error.

You can only compile the code for the Arduino Pro Micro. It is not an official Arduino board. Its made by Sparkfun. You first need to add it in the Arduino IDE, and then select it before you try to build the code. Google Arduino Pro Micro if you want to know more. Sparkfun has a lot of info about how to install it and use it.

Ok thanks Bro @@AxelsDIY Can I bought one (Arduino Pro Micro) have a link to buy it ? :) Thanks a lot :)

Awesome ! I select the "Arduino Pro Micro" in boards of arduino IDE and the complication got succeed ! Thanks Man, you're awsome !

Another question (sorry ^_^) What about the controller , are use an Android application ?

good that you got it working. There is no controller. It is just making random movements. In another video, I have this robot running around using sensors to turn away from obstacles. I have not implemented any remote control.