The Romi chassis with robot arm is a great opportunity to control hardware through WiFi. I chose the Adafruit Feather M0 WiFi board as the controller to do this, programmed using Arduino; the board fits nicely on the front of the chassis beneath the arm.
I wanted to use a web browser as the interface, so I modified the Arduino simple web server example code to generate a web page with sliders for the arm position and motor speeds. The web page sends slider values to the control code to activate the arm servos and to set timers used for PWM signals to the motors.
This makes for a robot that is easy to control and fun to drive and pick up small objects. The use of the web server and web page originating on the robot is an interesting approach to robot control.
The images below show the robot and the web page; the Arduino code is at