Here is one little experiment of converting a toy car to proportional control;
Yep, both steering and throttle control are proportional. Steering is spring type, actuator driven;
The idea is to use the servo controller board as H-Bridge ESC drivers for the car motor. The same is also true for the steering magnetic actuator. The steering mechanism is spring centered thus you can actually vary the actuator magnetic strength to define the deflection of the wheels. This can be adjusted further by defining the EPAs and D/R rates on the steering channel at the TX side.
For the Main Motor, i used an old Futaba S3003 servo control board ...
For the steering actuator driver, i used an ESky 8g servo control board.
You need to retain the pots on the servo boards and adjust them for a 0-volt center on the motor/actuator output.
The setup is powered by a small 1S lipo thus a charging port is required;
Motor and Steering actuators in action as controlled by a Futaba 2.4Ghz FHSS
Table Top run testing proportional control on both steering and throttle;
Full tests on proportional control on both steering and throttle on the ground;