This is the Arduino MRSC (Micro Rc Stability Control) for standard 3 pin RC servos!

Features:

For RC cars with standard 3pin servo, ESC and receiver
Provides about the same functionality as the Traxxas TSM stability management system
The car tries to follow the direction, which is requested from the steering wheel. Deviations are compensated with countersteering
I also have an Adruino RC system with fully integrated MRSC: https://github.com/TheDIYGuy999/Micro_RC_Receiver
Version for WLtoys 5 pin servos: https://github.com/TheDIYGuy999/MRSC_Adapter_WLtoys_5Pin_Servo
Programmable with Arduino IDE
2 inputs for standard 1000 - 2000us servo pulses
The throttle signal is passed thru and used as a speed reference for the MRSC calculations (not used anymore, see below)
Former throttle input now used as remote gain input
The steering signal is read and used as the steering angle reference
A new steering signal is then computed in accordance with the reading from the gyro sensor and sent to the servo
Uses an 8MHz, 3.3V Pro Mini
MPU-6050 gyro / accelerometer wired to the I2C pins
Gain potentiometer
Input for gyro direction inversion (if the MPU-6050 is mounted upside down)

New in V 0.1

New in V 0.2

Throttle input not used anymore, because it's impossible (because of the vehicle inertia) to use it as a speed reference in big vehicles
Former throttle input now used as a remote gain input
Wire the remote gain to CH4 and set the boolean "potentiometer1" (in the receiver configuration), if you use my "Micro RC" Arduino receiver
The gain can then be adjusted, using the potentiometer knob on the transmitter. also works with standard 2.4GHz remotes
Throttle output not used anymore. Wire the ESC directly to the corresponting output on your receiver
Auto steering range calibration. You need to move the steering wheel within its entire range after powering up the vehicle!
Variable MRSC gain: more around the center position, less towards the steering endpoints: allows to have a good stability and still be able to take sharp corners!
Tested in a JLB Racing Cheetah with Arduino "Micro RC" remote: https://www.youtube.com/watch?v=K1FvhzmcJDw

New in V 0.3

See videos and pictures

First test

Vehicle MRSC unit