reed switch and uses

[gatoulisss]

hello guys, i want to use a reed switch like an on/off switch but also as selector.
i have connected it in a pull up resistor and to a pic16f88 port. the use i want to make for example is 3sec the magnet to the switch then system on if i release and put the magnet again for 3 sec there then it is becoming off, but if i dont release then after 4 sec (3-on+1) then is selecting mode A, 5 sec (3-on+2) then is selecting mode B and 6 sec (3-on+3) then is selecting mode C till i release. in the system program im checking a sensor and is in 4 mode silent (on state) 15sec ring (mode A) 30sec ring (mode B) and last 60 sec ring (mode C)
i have problem in ho to use the on-off and the mode selector code... any help with it?

 

[KeepItSimpleStupid]

Read up on "contact debouncing". It can be done in hardware or software. A mechanical switch makes contact many times (bounces) before settling.

 

[gatoulisss]

i was thinking something like this for on off:
for (;; ){
start:
if (porta.f1==0){
on=1;
delay_ms(3000);
if (porta.f1==0 && on==1) {
......
.....}
if (porta.f1==0) {
on=0;
delay_ms(3000);
if (porta.f1==0 && on==0) {
goto start;
}
}
}

 

[KeepItSimpleStupid]

Check out contact debouncing. Also look at the reading of the switch at intervals using interrupts and count the number of intervals.
10-50 mS might be an OK time for a bounce.

Nothing is going to happen when waiting for the delay to be up.