I already gave you a schematic to control a servo with a pot. See here: https://kychem.wordpress.com/2015/06/24/robotics-controlling-a-servo-motor-with-a-potentiometer/ When we are all pretty confident with this and we are familiar with controlling things with bluetooth (BT) See here: https://kychem.wordpress.com/2015/08/29/setting-up-a-hc-05-bluetooth-module-with-arduino-to-control-an-rgb-led/ then we will use our smartphones to control the servo.
After that, we will try to create/assemble a robot car using modified servos. This requires modifying the mini servo’s as they are primarily designed to just rotate by some limiting angle. See here: https://www.youtube.com/watch?v=oXxq7LYRdYI << cool!
I have purchased some simple camera’s, with the aim of eventually getting a mobile robot car to send pictures real-time using a smartphone. :))))) Although the camera and arduino looks like it will be quite a challenge – but that’s part of the fun.