Problems with NXT buttons

Kowalski · Mon Jun 24, 2013 6:00 am

Hi, people! :biggrin:

I'm new in your community. I'm from Italy, so I'm sorry for my english mistakes. I hope to give you my contribute.

I am recently fond of robotics and I decided to buy a Lego NXT kit. I have a problem with the buttons of the NXT brick trying to run a function to wait for a selected button pressed.

It works only if I want to detect different buttons. If want to detect the same button pressed as it is in the code below, it doesn't work correctly.

After the first


	Code: until_button_pressed("enter");

the program pass directly to the first


	Code: until_button_pressed("left");

pressing once the "enter". It should request from the user to press "enter" twice (the same for "left").

I hope I'm enough clear to explain it.


	Code: void until_button_pressed(char *button) { writeDebugStreamLine("until_button_pressed(%s)",button); TButtons nBtn; nNxtButtonTask = -2; do {nBtn = nNxtButtonPressed;} while (nBtn == -1); if (button=="exit"\|\|button=="right"\|\|button=="left"\|\|button=="enter") { if (button=="exit") { nNxtExitClicks = 2; do {nBtn = nNxtButtonPressed;} while(nBtn!=kExitButton); nNxtExitClicks = 1; } if (button=="right") { do {nBtn = nNxtButtonPressed;} while(nBtn!=kRightButton); } if (button=="left") { do {nBtn = nNxtButtonPressed;} while(nBtn!=kLeftButton); } if (button=="enter") { do {nBtn = nNxtButtonPressed;} while(nBtn!=kEnterButton); } } writeDebugStreamLine(" - button pressed = %s",button); writeDebugStreamLine(" - button pressed = %f",nBtn); return; } task main() { clearDebugStream(); until_button_pressed("enter"); until_button_pressed("enter"); until_button_pressed("left"); until_button_pressed("left"); }

Problems with NXT buttons

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