The coin collector “CH-926 Coin Collector” was manufactured by the company Coin Selector and can be configured to recognise up to three different coins.
After configuration, the coin collector returns certain pre-configured pulse values for each coin types. This output pulse signal can in turn be interpreted programmatically by the Arduino IDE.
The Arduino IDE sends it's data to the LCD and Processing, where you can see your output.
Step 1: The Machine
Step 2: Building
Step 3: Programming: Arduino UNO
Download the file (sry for german cmnts) and test it out!
Step 4: Programming: Processing
I am not allowed to send you the code for the Processing work, but i can show you the final version.
Step 5: Done.