When I give PORTA.1 +5V, LED1 dosent shine..
Whats wrong with my code?
Code:LED1 var PORTB.1
PRESS var PORTA.1
loop:
If press = 1 then
high led1
else
low led1
endif
goto loop
end
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When I give PORTA.1 +5V, LED1 dosent shine..
Whats wrong with my code?
Code:LED1 var PORTB.1
PRESS var PORTA.1
loop:
If press = 1 then
high led1
else
low led1
endif
goto loop
end
Does your PIC have ADC?
If it does...
http://www.picbasic.co.uk/forum/showthread.php?t=562
http://www.picbasic.co.uk/forum/showthread.php?t=561
I dont know its a PIC16F648A
According to the data sheet it has two comparators.
The above links will explain why
CMCON=7
is needed.
Ok, thanks.
But it still dosent work as I want it :/
When i transfer it LED1 starts to shine directly even if PortA.1 doesnt have +5VCode:@ device pic16F648A, hs_osc, wdt_off, mclr_on, lvp_off, protect_off
DEFINE OSC 20
LED1 var PORTB.1
PRESS var PORTA.1
CMCON=7
loop:
If press=1 then
high led1
else
low led1
endif
goto loop
end
:/
Maybe the LED is backwards:)
Do you have PORTA.1 tied to ground with a resistor (10K) so it is not floating?
Floating ?
Should it be like this?
http://img168.imageshack.us/img168/3927/floatej7.jpg
Yes, that is correct.
I added it and it worked!
Thanks.
If I make the code like tis:
Should it be like this?Code:@ device pic16F648A, hs_osc, wdt_off, mclr_on, lvp_off, protect_off
DEFINE OSC 20
LED1 var PORTB.1
PRESS var PORTA.1
CMCON=7
loop:
If press=0 then
high led1
else
low led1
endif
goto loop
end
http://img528.imageshack.us/img528/1509/floatqs4.jpg
No. The first way is what you want. When the switch is open the pin is "0"LOW. When the switch is closed the pin is "1"HIGH.Quote:
Originally Posted by xobx
If you are using push buttons, you will need to use either a normally open "NO" or a normally closed "NC".
The resistor keeps the pin LOW (no float). High resistance is used to minimize the current through the switch (just a little short).
Depending on how you look at it this is called a pull up or a pull down.