Thanks. I am trying to send an SMS using TC35i & 16F690. I tried to replicate the schematic at this link: http://techni.caliti.es/blog/2008/12...ontroller.htmlOriginally Posted by pedja089
On google or wiki
RS232 standard:
logic "1" is -3 to -15V
logic "0" is 3 to 15v
-3 to 3 is not defined
TTL standard:
logic "1" is 2 to Vcc (usually Vcc=5V)
logic "0" is 0 to 0.8V
Edit:
0.8 to 2V isn't defied
I used the pins 10 & 12 of 16f690 instead of 17 & 18 of 16F873. Hope it will work
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