I am going to make a logging device that logs the GPS data to a microSD card. I have the microSD logging harware and it works, and I will probably be using pic18f26k20 chips.
The reason is I want to log longitude and latitude repeatedly so I can apply these to a scatter chart.
I will be using the GPGLL sentence since its structure places longitude latitude first, then the time. That way parsing this sentence will be easier since the time structure length can vary since the leading value may be missing.
The problem I am experiencing has to do with hardware, the various RS-232 to USB adapter doesn't always work. (I am using Terminal or PuTTY for intial work with the GPS unit))
I have several converters in my junk box but most of them either don't work or are very unreliable.
My AXE027 (from picaxe days) always works and I understand it may have something to do with type of chipsets included in the converter (FTDI ?) .
Any suggestions on buying reliable RS 232 converters from eBay or other sources online (Widows 10).
Last edit: Paul Haug 2018-03-19
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Curious, how are you implementing the micro sd card? Is it through a GCBasic library and raw hardware, or an interpreted serial comms module of some kind. Good choice on the 18f26k20.
P.S. That a SD or a SDHC card being used?
Last edit: kent_twt4 2018-03-20
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I will be using a Sparkfun "open log" device that recourdes ASCII data to a microsd card, so all the hard work and interface is done for me. It only accepts ASCII data so the card can then be plugged into a desktop and read into a spread sheet, which will make my scatter plot super easy. https://www.sparkfun.com/products/13712
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I am going to make a logging device that logs the GPS data to a microSD card. I have the microSD logging harware and it works, and I will probably be using pic18f26k20 chips.
The reason is I want to log longitude and latitude repeatedly so I can apply these to a scatter chart.
I will be using the GPGLL sentence since its structure places longitude latitude first, then the time. That way parsing this sentence will be easier since the time structure length can vary since the leading value may be missing.
The problem I am experiencing has to do with hardware, the various RS-232 to USB adapter doesn't always work. (I am using Terminal or PuTTY for intial work with the GPS unit))
I have several converters in my junk box but most of them either don't work or are very unreliable.
My AXE027 (from picaxe days) always works and I understand it may have something to do with type of chipsets included in the converter (FTDI ?) .
Any suggestions on buying reliable RS 232 converters from eBay or other sources online (Widows 10).
Last edit: Paul Haug 2018-03-19
I have never had a problem with different USB/ttl serial converters, Prolific PL2303HX, CH340G, and FTDI232RL.
Here is the one I have been using lately, cannot attest to genuine article or not, plug this into ebay
Mini FT232RL 3.3V 5.5V FTDI USB to TTL
Thanks Kent, I give it a try. Those are certianly cheap enough, so no great loss..
Curious, how are you implementing the micro sd card? Is it through a GCBasic library and raw hardware, or an interpreted serial comms module of some kind. Good choice on the 18f26k20.
P.S. That a SD or a SDHC card being used?
Last edit: kent_twt4 2018-03-20
I will be using a Sparkfun "open log" device that recourdes ASCII data to a microsd card, so all the hard work and interface is done for me. It only accepts ASCII data so the card can then be plugged into a desktop and read into a spread sheet, which will make my scatter plot super easy.
https://www.sparkfun.com/products/13712
Very interesting, looks like a very capable module, thanks for pointing that out.