Problems with switch for a PIC

[apple]

hi, i am connecting a switch to my PIC to toggle the program to stop and call the program go back to the main program. But whenever i toggle the button, my LCD will "hang" and display odd words. i have tested using connect 5V directly to the circuit and no problem occurs. But when i soldered the switch to it, there are problems occur.
Can anyone help me??????

 

[gidimiz]

switch problem?

Hi,

Did you set the input pin to the correct level ( input and not output? )
Also, see what happens to the voltage on the board, when you press the switch. Do you still have 5 volts or you get a faling spike?
Also, Try using a falling edge on the switch. i.e. the line to the pic is connected with a pull up and when you press the button you will connect the ground to the PIC input.
If all failes, post a schmatic so we can have a look and find out the problem.

If you found my answer useful, click on the button that says Helped me. ( NO points will be taken from you! )


Good luck.

 

[Moss]

Re: switch problem?

May be your button "ringing" and looks for your program as multiple pressings occur? Check this, it is a frequent problem ...

 

[glenjoy]

switch problem?

Use a debounce, there it will help you stabilize your shift in signal.

 

[trigger74]

Re: switch problem?

try to add 0.1uF across the input of the mcu and ground, that will do help to minimize the ringing due to the switch operation.

 

[pvinbox@yahoo.com]

Re: switch problem?

hai

u have to use debounce delay
then your problem will get o.k

 

[banh]

Re: switch problem?

hi, i am connecting a switch to my PIC to toggle the program to stop and call the program go back to the main program. But whenever i toggle the button, my LCD will "hang" and display odd words. i have tested using connect 5V directly to the circuit and no problem occurs. But when i soldered the switch to it, there are problems occur.
Can anyone help me??????

post your schematic showing how you interface the switch..