I just picked up an electric wheelchair that I intend to make into a multipurpose outdoor service bot. It is was a Jazzy 1101 if you want to see what one looks like. This particular chair has the joystick controller separate from the motor driver - makes it much easier to hack. I have hooked up my scope in an effort to decode the signals and found that it sends a 6 mS burst of serial data every 10 mS. It looks like each burst is 20 120 bits long but it is hard to tell because the traces jump around quite a bit. If I am real careful - sometimes I can lock into the signal where the first half is clear but the second half of approx. 20 120 bits vary wildly. It may be that it is sending two bursts where the first ten bits or so are the same for both.
I'm thinking that there should be a simple way to read this using the Propeller chip, maybe using Viewport?
What would be the simplest way to capture this serial data and have it displayed in real time so that I can figure out what all the bits do?
Post Edited (W9GFO) : 6/20/2009 5:18:10 AM GMT