Freematics Forum

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...

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 ...

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...

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...

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.

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...

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?

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...

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...

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 ...