What's the voltage on output pin when it's HIGH?

[TonyA]

Hi,

I was wondering what voltage is produced on an output pin when it is toggled "HIGH"?

I always assumed it was 5V, but when measuring it was only 1V, I wondered if my meter is off.

I am looking for a way to produce a TTL level output pulse; 5V (and 0V) (Similar to the output of a Schmitt Trigger Pulse Oscillator or a 555 timer IC)

Would I need a transistor for this, or can I just use the Pic by itself?

Thanks for any advice.

T

[mister_e]

when you set a pin to HIGH it should close to Vdd, if not, you probably forgot few things

disable the Comparator
disable the ADCs
this pin is a open-collector type.
This pin is a INPUT only.. can't be an OUTPUT
etc etc etc

http://www.picbasic.co.uk/forum/showthread.php?t=561

since we don't know the PIC and I/O you're using...

[TonyA]

I am using 18F452, and reading portb.7.

It lights an LED the way it should, but I only read 1-2V.

Thanks,
T

[mackrackit]

I am using 18F452, and reading portb.7.

It lights an LED the way it should, but I only read 1-2V.

With or with out the LED attached?

[keithdoxey]

With or with out the LED attached?

And if WITH the LED attached, did you also include a current limiting resistor in series with the LED ?

[TonyA]

And if WITH the LED attached, did you also include a current limiting resistor in series with the LED ?

I don't remember... I'll test again and re-post.

Thanks again,
T