Dan blogged about his Servo tester with OLED display project:
The problem is simple: I need to have a reliable and easy to use servo tester, that I can use to test/play with a standard RC servo or ESC or anything else that uses the same control protocol.
This necessity has arisen again quite recently, while working on the 2nd iteration of my ball balancing device.
Project info at Trandi project page.
Check out the video after the break.