system
January 2, 2013, 9:30am
1
Just wondering about the software serial library and using that to communicate with my old MFJ TNC.
Does it simulate the RS-232 serial interface?
I would like to have the Arduino send APRS packets.
Perhaps digipeating thru the ISS, mobile?
Or part of a weather station project, sending WX data.
system
January 2, 2013, 1:20pm
2
The serial output on an Arduino doesn't match the RS-232 voltage levels. To do the conversion, you can get a MAX232 module through eBay for a few dollars.
JD3:
Thanks - I guess I need a 12 volt module?
Not just a 12V module but one that converts the TTL to +/- 12V, with +5V converting to -12V and 0V converting to +12V.
system
January 2, 2013, 5:00pm
4
Thanks again - I looked up the specs on Digikey.
Exactly what I need