Control de puertos PIC16F877A / Port Control PIC16F877A

[martintorres]

mmmm, not ... Sorry for not being very clear ... Look, what I do is similar to the tachometer:



The first design tachometer, just went with 7-segment display and visualilzacion not good ... Now I would like to do it with a LED bar very similar to photo.
regards friend

[martintorres]

aaaaaaaaaa but archangel opened my eyes a little file that rose ( machine tach.txt) ... What I'm going to study a little to see if it is what I play and commented glance

[Archangel]

aaaaaaaaaa but archangel opened my eyes a little file that rose ( machine tach.txt) ... What I'm going to study a little to see if it is what I play and commented glance

I wouldn't put too much on what you found in my machine tac, it's too slow for automotive I think, you would want a timer bases counter, given the sample rate of an auto ignition. As far as the question you asked : PortB = %11111111 should set all PortB to high state. I prefer binary as I do not get confused, you could use decimal or hex as well i e . . . portb = FF or portB = 255 .
If you use the LM3914 as you mentioned you will have an analog tach with a digital display, with all the advantages and disadvantages of both.

[AvionicsMaster1]

If using hex don't you need the $ sign? For example Portb = $FF

[Archangel]

If using hex don't you need the $ sign? For example Portb = $FF

Yup, oversight, my bad. $FF

[mackrackit]

Ok, what about shift registers?
http://www.picbasic.co.uk/forum/showthread.php?t=10200

[martintorres]

good topic to which I recommend, I'll consider. It crossed my mind the idea of implementing a shift registers, but as I take all the 16F877, and reduce the hardware, I happened to see a way to control all software ports.
I understand that tastes often bring difficulties, lol, but in this case, is also a question of space.
regards friend