Search found 19 matches

by mikebolt
Fri Oct 21, 2016 8:07 am
Forum: Freematics Products
Topic: Security
Replies: 1
Views: 5137

Re: Security

That is a great question. I don't think that there is any way to disable wireless programming via BLE. You could try to remove the whole BLE module, but it looks like it's soldered in, and doing so might make your device unusable. The pcb schematic doesn't seem to show the BLE wiring. If we knew how...
by mikebolt
Thu Oct 20, 2016 6:15 am
Forum: Freematics Products
Topic: V4 hardware specification guide?
Replies: 8
Views: 20563

Re: V4 hardware specification guide?

I don't think there's any way to know that without the STM32 code. The ATGRR command only returns one GPS fix, although it looks like sometimes it returns both a GGA message and an RMC message. I hope you keep experimenting with sampling while waiting for the GPS messages. The ~7Hz sampling is good ...
by mikebolt
Wed Oct 19, 2016 11:00 am
Forum: Freematics Products
Topic: V4 hardware specification guide?
Replies: 8
Views: 20563

Re: V4 hardware specification guide?

I went through the data sheets trying to figure everything out. I also asked Stanley a few questions. He told me that the LED indicates activity between the STM32 chip and the ATMEGA328P chip. The two are connected via SPI. I know that activity between them will occur in the initGPS method and whene...
by mikebolt
Wed Oct 19, 2016 10:44 am
Forum: Freematics Products
Topic: Collecting GPS and speed data via USB Power
Replies: 2
Views: 6573

Re: Collecting GPS and speed data via USB Power

Yes, this is possible. I got it to work connected to a laptop outside. However, you will have to modify the datalogger sketch. When not connected to OBD, it will call the "init" method every iteration of the main loop. When there's no OBD connection this method takes over 5 seconds. This m...
by mikebolt
Fri Oct 14, 2016 12:07 pm
Forum: Freematics Products
Topic: Collecting GPS and speed data via USB Power
Replies: 2
Views: 6573

Re: Collecting GPS and speed data via USB Power

Maybe. I have gotten it to log to the SD card via USB power. I even tried logging the raw GPS NMEA messages. They were properly formatted, but they had no valid data except for the UTC timestamp. Weird.

Not sure about accelerometer or gyro. I didn't try those.
by mikebolt
Wed Oct 12, 2016 9:41 am
Forum: Freematics Software
Topic: Datalogger usage
Replies: 4
Views: 15379

Re: Datalogger usage

You could try using the SdFat library instead of the SD library. SdFat is just a newer version of that library, and they might have fixed a bug that is causing your problem. I got SdFat working with the gptest sketch. I also got it working with the datalogger sketch, but I have modified it beyond th...
by mikebolt
Wed Oct 12, 2016 3:53 am
Forum: Freematics Software
Topic: Datalogger usage
Replies: 4
Views: 15379

Re: Datalogger usage

This is a known issue. See this post: viewtopic.php?f=2&t=1885

Do you get a DATA directory with some empty files in it?
by mikebolt
Tue Oct 11, 2016 8:09 am
Forum: Freematics Products
Topic: V4 hardware specification guide?
Replies: 8
Views: 20563

Re: V4 hardware specification guide?

I agree that some more information would be very helpful. I am also curious about the LED light. What I would like to know is if there is a way to send commands directly to the GPS receiver. It seems that the board was designed to pass all of the OBD and GPS information through the STM32 unit. The A...
by mikebolt
Wed Oct 05, 2016 9:16 am
Forum: Freematics Products
Topic: Error: Unedited V4 data logger >GPS output shifted by 1 row
Replies: 5
Views: 15242

Re: Error: Unedited V4 data logger >GPS output shifted by 1

I'm not sure if it will resolve this issue, but here's my reasoning: The datalogger sketch uses the results of $GPS command. This command combines the useful information from both the GPRMC and the GPGGA NMEA messages. It is probably handled by the STM32. There is also a function that returns the &q...
by mikebolt
Wed Oct 05, 2016 4:35 am
Forum: Freematics Products
Topic: Error: Unedited V4 data logger >GPS output shifted by 1 row
Replies: 5
Views: 15242

Re: Error: Unedited V4 data logger >GPS output shifted by 1

I also have this issue. When it occurs, I get data like this: 6,DTE,0 0,UTC,240916 0,LAT,18562050 0,LNG,35195680 0,ALT,-27563 0,SPD,200 0,SAT,36 The DTE, UTC, ALT, SPD, and SAT values are incorrect. However, because LAT and LNG still appear correct, I don't think they are all shifted by one row. In ...