Back in the 70s I'd print horizontal graphs on the teletype a row at a time using ===== chars. Later, in the 80s, when the teltypes ran out of yellow paper, they had capital letters only crts that worked like teletypes, but the horizontal graph trick still works. I use it all the time with avrs and teraterm.
For Atmel's Xplained and sensor boards:
Sensor Xplained Demonstration Projects, Atmel Data Visualizer.
by Aaron Carman
by Aaron Carman
by Jake Hertz