Arduino doesn't have much in terms of debug and analysis capability built in, so it can be very useful to have a facility to plot data that's sent from Arduino over the Serial Port.
There are several ways to do that including Processing, Python + Matplotlib etc.. but none of these methods work effectively with very little setup and offer expected features such as Zoom, Scroll, Write to File, Save Setup etc.
I want to show you how to produce the kinds of plots illustrated in my Frequency Detection Instructable.
The Software I used to produce those plots is Bridge Control Panel.
It's released as a part of Cypress Semiconductor's PSOC Programming Utilities.
By the way. If you like this Instructable, you might also like to read My Blog covering various projects and Tutorials.
// RX8 [h=43] @1Key1 @0Key1 Serial.print("C"); Serial.write(data>>8); Serial.write(data&0xff);We Signal that we're sending a data byte then send each byte of the int.