Help with pic16f690 -max232cpe

[krise86]

I have already tried that, so it's still a no go.

But no one has commented on the voltage levels of the max. it should say 10 but i dont get it higher than 7. when i rebuild the whole shematics on the breadboard the voltage got i little better but still no higher than 7

[aratti]

But no one has commented on the voltage levels of the max. it should say 10 but i dont get it higher than 7. when i rebuild the whole shematics on the breadboard the voltage got i little better but still no higher than 7

Check the capacitors used. See snap attached for value.

Al.

[Dave]

krise86, Depending on the capacitator values used with a MAX-232 the charge pump voltages should be around +-6 volts to +- 9 volts. The TRUE RS-232 spec calls out for mark,space voltages of +- 3 volts minimum... Some laptop computers now days do not meet the TRUE RS-232 spec limits as some only put 0 to +5 volts... That is why some laptop computers don't have a solid serial communications...

Dave Purola,
N8NTA

[krise86]

Yeah i am using 1uf caps, so it's not that. and i am reciving at this moment v- = -1.86 and v+ = 6.96.

I found out that i can use the pickit 2 as logic analyzer. and i see the bytes roll inn when the pic send out to pc but not ther other way around.

Im stumped... this sould work!
I have followd all the guidelines and shematics and caps. i have also oredered some new max and pic's. also alot of caps and resistors. I really want this to work.

Thx for all the help so far. i will get this to work! i hope

[krise86]

Okey so finally i got this working, but the story about how i did it is kinda BAD.

So after a while i was beginning to wonder why it was reading wrong voltages. and i knew the connections where right, until i look really close to the serial cabel, i used a rs232 to rj45 and a cat5 cabel, but i somehow got the colors mixed up. So ground was not connected. heh.... well u think stupid you, and yes stupid me. not going to that mistake again. So then i started to check the connection on my breadboard and pow it splits in the middel where i had put my pic. so basicly i had half of the earth connections not connected. And i connected it this way after it was connected the right way. but then i did not have the pin 5 from rs232.

Maybe it's a lesson to learn from all of this. ALWAYS check ur cabel and make sure pin5 is connected.

BTW how many times have i answerd What colour is a ripe tomato?
lost count

Sorry to have wasted everybodies time but i really appricihate it.

And i did learn alot from searching and reading around the net.

Thx for all the help once again and sorry that im such an idiot

[mackrackit]

Glad you got it working.
Do not be sorry for making a mistake, it happens to all of us.
I spent a just spent a couple days in something and the problem was not turning the ADC off!!! How many times have I told others to check that? More times than a tomato is ripe!!!

[krise86]

yeah but still.
One more question tough. why cant i run a for loop?

for count = 1 to 40
pulsout PORTC.1,200
pause 20
next count