Two-Wheel Self Balancing Robot using Arduino and MPU6050 . Well guys I know its not a new type invention but still many hobbyist still love to see the electronics. I will go here with the cheap parts in order to keep minimum cost for all those young inventors who want to complete this instructable !! Savvy !!
Hats Off Lets go
Sorry for my english as it isn't my tongue language so beware and bear me for some moments.
Step 1: Collecting Items (Tiresome :P)
1. Arduino UNO in USA or Genuino outside USA
2. MPU 6050 Gyroscope from ebay
3. BO geared plastic motors (150-300 RPM)
4. L293D Motor Driver
6. Capacitors of ceramic type (0.01uF)(not used here)
7. A charger (Wall charger USB type)
Note - Motors should be of high torque and speed as well. Torque is required to lift the weight when the bot falls on either side. If it wont have such required force then you might have to visit hobby shop again!! for better ones.Speed is required for a faster response to any change in bot from sudden jerks.
Step 2: Frame"Work"
Without any screws or bolts I am keeping here simple.
Take a (1 X 2 cm) strip of double sided tape and stick it to the ede of motor.
Similarly we will need four strips here. Two for each motor.
Then choose distance between motors. I generally keep it between 8-9 cms.
With a rotary cutting tool cut off rule of length 6cm from beginning.
We will do here same for two rulers.
Then stick the rulers keeping symmetry to both sides of motor.
I actually did this step so kinda lack my images. Well nothing to worry I have a completed one.
Step 3: Upperframe Work
As you can see in the above video how I managed to make a cardboard frame to fix it on the motor frame. You can choose any height. However I chose around 10.5 cms.
Now on each side as in picture you have to punch out two holes on each side of frame. They must remain aligned. We are going to fix the motor driver L293D on it. I have cutted out a piece of cardboard with dimensions. It is having 3 holes. Two for motor wires and the fron one for IC and power wires of shield.
Step 4: Full Body Assemble
In the video you can see how I have assembled this bot using just some tapes and band. Remember the bot must not be too heavy at the top as we are using low quality motors. High RPM with HIGH torque is preferred like the johnsson motor. RPM will help to bring robot back to its C.O.G position if tipped by a large angle and torque will help the bot to bear the weight above itself. So try to keep the height a bit low to keep the bot stable.
Step 5: Calibration
Open Arduino IDE and find the source code from this *link*
The code involves main code with I2C ino. Rename this code to I2C.ino.
Also download the Kalman filter library from TKJ Electronics Github.
Open the first link and then click sketch the add file. Select I2C.ino and add.
Now hold your bot still perpendicular as possible and note down the angle from serial monitor. Now in the source file use that angle as limit.
For circuit Motor Shield pins would go as
INT1 = D6
INT2 = D7
INT3 = D3
INT4 = D4
SCL = A5
SDA = A4
For a person like me who hates batteries I shorted 12V with 5v terminals on motor shield and powered them with charger 5V/1.55 A output. You may follow your own power method.
Thank you guys,
Instructable managed by Ambika and Shashi Cheers
Links Updated Guys !!! Comment to let me know if doesn't work
Step 6: Updates
Updated the code
Bot can now face some pushes
Some code changes introducing a better auto callibration.
Have a look on pic.
Will update code soon after some testing.