Self Balancing Robot

I am working on a small self balancing robot for couple of days. It is not completed yet. To minimise the cost I used breadboard itself as a frame instead of a wooden or an acrylic one.

1 x Breadboard (small)
1 x Arduino pro mini
1 x IMU MPU 6050
1 x Motor driver
1x Powerbank (TP Link)
2 x DC Motor

Things done

Get raw data of IMU
Get pitch,roll and yaw
Control DC Motors from arduino

Thing that need to be done

Implement PID
Tune Kp,Ki, and Kd.

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Product Design of a 4 wheel differential drive robot