controller state and values

Forum 2005-2010 (read only) Software Syntax & Programs
#1

Hello,

i want to send the state of a two axis joystick and two buttons from a controller over Serial using two XBee modules. JoystickX, JoystickY, button1 and button2. I get values for the joystick that range from two to three digit integers (say values of about 70 - 200) and the buttons are single digit integers, 0 and 1, showing the button on and off. I thought I'd convert the integers to HEX, send them over the serial connection, then convert back to int on the other side. the position of the values relative to a final println determine what the value represents. does it make sense to do it this way? Any suggestion?

thanks

#2

Any suggestion?

Just makes sure you’ve got some easily recognisable delimeter that can’t be mistaken for data, between frames of data.

#3

The use of delimiters is important. I’d suggest two, though. One to mark the start of data, the other to mark the end of the data. Separate the values with a delimiter, too.

For example, send “<170, 240,0,1>”.

The receiver then knows what constitutes a valid frame. If it, for some reason, sees “0,1>\n<180,259,1,0>\n<129,” as available to read, it would know that the first few bytes do not constitute a complete frame, so it would not try to do anything with “0,1>\n”.

#4