Programming joysticks

[Robert Hafner]

Because the last bits are unreliable (from what i've read), how will this affect the program? Should I stick with a general area? example:

if (p1_wheel >= 42 && p1_wheel <= 46)
    // I am neutral
if (p1_wheel >= 250 && p1_wheel <= 254)
     // I am upperleft;

[Astronouth7303]

Originally Posted by Joe_Ross

Why not #define them, instead of taking up memory?

I don't like using #define for constants. Besides, we've got memory to kill.

[deltacoder1020]

Originally Posted by Astronouth7303

I don't like using #define for constants. Besides, we've got memory to kill.

hmm... apparently the forum system managed to place a reply in a different thread... right.

[Tridelvior]

Do you know the non-binary values of the pX_wheel in their up- and down positions?

I am trying to use their values with a pwm and do not know what to use.

temp = p1_wheel;

if (temp==WHAT VALUE?[UP]){
pwm02=200;
}
else[DOWN]{
pwm02=55;
}

[Ryan M.]

Originally Posted by FotoPlasma

Basically, if you can understand binary, you can take advantage of the POV hat for controlling your robot.

You also have to good at bit manipulation in C!

[Erico]

If u can make me a favor, can u teach me how to program the joysticks. I will appreciated. thank u

GOOD LUCK THIS YEAR

[deltacoder1020]

the inputs from the joysticks are held in a range of variables (actually aliases), set up in ifi_aliases.h:

for instance, the x-axis of joystick one is p1_x

if you want direct joystick-to-pwm control, just use something like the following line:

pwm01 = p1_x;

[Ryan M.]

Originally Posted by Erico

If u can make me a favor, can u teach me how to program the joysticks. I will appreciated. thank u

GOOD LUCK THIS YEAR

Just to expanded on what DeltaCoder said, the joysticks are refered to by pX_x and pX_y, where X is the port number the joystick is attched to. For example to access the x and y axises of the port one joystick you would use p1_x and p1_y.

The value that comes in on these pins is between 0 and 255 (an unsigned char). 0 is full to one side, 127 is center, and 255 is full to the other side. For instance, if you have the joystick all the way forward, p1_x would be 255 and p1_y would be 127. If you had it all the way to the right, p1_y would be 127 and p1_y would be 255.

You could also have a combination of the two, of course. For instance, if you where in the forward, right corner, you would get p1_x and p1_y both reading 255.

You can use these values in any way in your program. Just don't try to change their value in code; it won't work!

Hope that helps. Good luck.

[iamjarret]

hey, i have a question
we plugged a motor to the pwn port that corresponds to p1_wheel(the wheel)
and teh operator interface shows that when we move the wheel, the values are changing (input), but it is not moving the motor. It is correctly mapped (pwm09 = p1_wheel

how can i get it to work



also, i would like to make code the made a pwm got to speen 255 when p4_sw_trig (trigger) is pushed(equal to 1).

my code so far is
if (p4_sw_trig == 1)
{
pwm12 = 255; (for this i commented out pwm12 = p4_wheel

i also tried p4_wheel = 255;

and i tried p4_wheel = 0xFC;


}

lastly, the y axis dose'nt work on ports 3 and 4 on any joystick i try



please help me fix my code, wheels, and y-axes

thanx

[Smrtman5]

I have two basic questions. First, can those old robot interfaces be programed for C or are they strictly the old stuff?

Second, does anyone have an old program with just the two joystick controls? All we want to do is hook up an old interface to a mock control board so we can make sure the trannys work.

(Note: Im the fabricator, the only thing i know about computers is how to break one)
Hopefully i can relay this answer to one of our more knowledgeable people. Thanks

[Ryan M.]

Originally Posted by Smrtman5

I have two basic questions. First, can those old robot interfaces be programed for C or are they strictly the old stuff?

Do you mean the old robot controllers? If so, they can only do the old PBASIC stuff.

[FotoPlasma]

Originally Posted by Smrtman5

Second, does anyone have an old program with just the two joystick controls? All we want to do is hook up an old interface to a mock control board so we can make sure the trannys work.

InnovationFirst has "Legacy Documentation" on their website. They have default code, written in PBASIC (for previous years' control systems), for both single and dual joystick driving. Here's a link to download those programs. They're listed under "PBASIC Code", but you will also need a copy of Parallax's computer program, in order to program your controller. Links are listed on that same website under "Programming Tools".

If you need any more assistance, feel free to ask.