anyone know what to do for external i/p or o/p v3board

phatali · Post by **phatali** » Sun Nov 19, 2006 1:11 am

hi
im new to programming and have just got a v3 board. im trying to attach an external switch on port A. i have some code that if i press sw4 on portA rb0 is activated and also a display on the lcd screen, but now i want an external switch to do this, anyone know what code is needed to allow me to do this. by the way at the moment im using a PIC16f88.

thnks in advance

Post by **Benj** » Mon Nov 20, 2006 10:13 am

You should be able to keep your code the same and just change the hardware to allow for the external switch. If you wire up your external switch as follows then the external switch will behaive like the switch on the board.

RA4---Switch---300R---+V

Post by **Steve** » Mon Nov 20, 2006 1:17 pm

You can attach Ben's circuit to the RA4 screw terminal on the left side of the development board.

If you plan to use a switch in your own circuit (i.e. not using the dev board), then you will also need to provide a path to 0V for when the switch is not pressed (e.g. a 47k resistor between RA4 and ground).

phatali · Post by **phatali** » Sat Nov 25, 2006 7:46 pm

thanks guys for the help, i shall have to try these out

cheers !