Quoth Hal Murray at 2008-03-07 19:59... > The normal MAX232 type level shifters include an inverter. > > So even if the voltage levels work without a level shifter, the signal will > be upside down.
I'm building my test board with a hex inverter that I'm actually using to buffer the 1PPS signal. I've got spare gates on there so will build the board with jumpers so that I can invert or not invert (that is the question ;-)) As I'm working with two different types of GPS module, and may have others, my development board will have a lot of jumpers so that I can actually patch together something that works before I build the final boards - something that I feel necessary as I always seem to get my TX/RX mixed up! Just to clarify - I don't tend to use breadboards as they tend to take longer to debug than making a PCB. When PCBs are concerned, I tend to use SMDs wherever possible until such time as I find a way of making holes that a) doesn't break my drill every other hole and b) actually lines things up properly. (A CNC XY drill rig would be really nice - better buy a lottery ticket.) Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
