Firmata link between processing and arduino

The simplest way to get processing and the arduino to talk is by loading the
standardFirmata sketch onto the arduino. This recognizes whether pins are inputs or outputs based on the processing code.

Then on processing I am using a simple code to display data
firmataReadAnalogMultipleandDigital.pde which reads analog pins and a digital pin

Firmata link between processing and arduino

Now running a sketch in processing that reads the values of 3 sensors, actually potentiometers for testing. Displays values as bars in processing, and the circle is colored RGB by these values.

Firmata and contro of arduino from PC

Good explanation of firmata using processing and also here, and then the version for Visual Basic