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Topic: SR-92 GPS connectivity to arduino (Read 528 times) previous topic - next topic

BigusDickus

Hi,

I've just dug out a couple of SR-92 GPS modules (here's the datasheet http://www.seeedstudio.com/depot/images/product/sr-92.pdf ).

According to my reading of the datasheet, I think I need to pass the signal through a level shifter i.e. a max232.

The section on protocols says "Both NMEA and SiRF binary protocols could be supported via serial UART I/O port -
RXA/TXA."

The section on pin assigment says "Port A serial data output (GPS out); N-8-1, NMEA v3.00 output" and the section entitled 'digital output'  says "Digital I/O VIH: 2~3.15V, VIL: 0~0.85V
VOH: >2.1V, VOL< 0.72V"

Can someone please give me a 2nd opinion on this? Note - I'm only interested in reading from the GPS, not talking to it. Bearing this in mind, can I get away without the level shifter? (it'd make my circuit easier if it does)

Thanks

Runaway Pancake

Given:
"Digital I/O VIH: 2~3.15V, VIL: 0~0.85V
VOH: >2.1V, VOL< 0.72V"

no "level shifting" necessary.
Serial.begin(4800)
"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

BigusDickus

Thanks

Luckily I found two of them, so if one gets fried, I've still got a spare.

Cheers

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