My two cents : GPS receivers need as clean a power supply as you can give them. Motors flipping direction can put so really nasty power spikes on the power system. I'd recommend isolation the logic from the drive train if possible.
Hi Nathan - I ended up using a 1mh super low resistance inductor in series with the +6V line as well as two ultra low resistance caps, a 10uf tantalum and a .1uf ceramic, going from EM-406 supply to EM-406 ground. I got a message back from tech support at usglobalsat where they said:
"No problems are found if you utilized a 6V line within 100mV noise. If noise exceeds 100mV, it may affect EM406 performance. Adding a bypass capacitor and using 5V LDO on the 6V line are both feasible. An alternative to this, is adding a bead on the 6V line."
so I think my solution should be more than adequate.
Can I ask how to collect the data from the EM-406, or just give power and the dta will automatically output. Can I connect it with RS232 or I need to convert it. Please advise
Give it power and it will start spitting out NMEA 0183 data over the uart. this is all outlined in the datasheet, which you have obviously not read.
brianhomer wrote:Dear sparky,
I am starting use the recent ordered EM-406, However, I need some example to connect it and get the data. where can I get this from?
I assumed use the MAX232 IC to convert the TTL to RS232 level, am I correct. then I can use RS232 collect the data. any important points I ignored?
Please comment! thank you!
A max232 circuit is indeed all you need to connect the EM-406 to a RS-232 line.