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Author Topic: Can't read data from GPS module  (Read 1990 times)
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CompWiz17
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« Reply #30 on: October 15, 2011, 04:55:42 pm »
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Yes, the signal is being inverted, but it requires external circuitry, as described above.  

I'm just saying that it would be nice if we could eliminate some of the circuitry, make converting from rs232 to ttl simpler.  

I mean, if we can eliminate the external not gate, then that would mean you could convert a 5v rs-232 signal to ttl using only a diode and a resistor.  Or, maybe even eliminate those as well, since the arduino already has something built in to eliminate negative voltages. 
« Last Edit: October 15, 2011, 04:57:18 pm by CompWiz17 » Logged

zoomkat
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« Reply #31 on: October 15, 2011, 05:49:17 pm »
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I mean, if we can eliminate the external not gate, then that would mean you could convert a 5v rs-232 signal to ttl using only a diode and a resistor.

If you look at the below, I inverted 12v rs232 to 5v TTL just using two resistors and a transistor from Radio Shack. Some times it is easier to just do it and move on.

http://arduino.cc/forum/index.php/topic,74650.msg562845.html#msg562845
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