@seb I notice that the cordination has abit delay first time you upload it... and it start working once you reboot it :)

@stefan85e Having Pytrack AND Wifi, you have two sources for the time: a) a NTP server. For that you have to espablish an internet connection. Look at the documentation & examples for WiFi and Internet access, Section https://docs.pycom.io/chapter/tutorials/all/wlan.html, heading: "Connect to a router". b) GPS. This is a little bit more tricky, since easy to use examples are missing. You can at least use the examples from thy Pytrack existing library and use that to derive the time information.

@robert-hh Thx, work kept me a bit busy but found some time to play today. I went the micropyGPS frozen module route. I've been running into issue after issue trying to get the dev environment up on OSX. So had to deploy a ubuntu box with all the tools first and flashed the new firmware from there. Preliminary tests show that the frozen module and the code works. Obtaining a GPS lock indoors not really yet however I need to look into it further. At least now I have more data/cmds to start troubleshooting. I have a Pi Zero with attached GPS module, 3G dongle and external GPS antenna which gets a GPS lock indoors fairly quickly and is using 3G to transmit coords so that's my benchmark. My goal is to downsize this tracker to sipy-pytrack-sigfox. Thx all for the pointers and support.

Once the GPS module goes into standby the i2c stops working, you can no longer wake it up via i2c, all you can do is a reset via the pytracks deep sleep function.

Hi Not noticed the lTE issues as this does not work in the uk. It should keep the almanac and other data when in sleep mode, however the sleep architecture is one where essentially recovering from sleep is a (re)boot, so you need to design accordingly. Also, do not use an SDCard as this will stop the sleep current from going below 5mA. I have not progressed this for over a year. Sorry.

@seb No luck with pull up resistors. There is also garbage when connected on P22/P21. PyTrack connected to the same pins with the same settings goes smooth. While connecting our L76-L there is no response on I2C ;-( only garbage response for i2c.scan(). Maybe you reconfigure L76-L chip through UART after mounting ? Will try to connect oscilloscope and/or logic analyzer

@jonasde On the bottom of your Pysense board you will find a 5x2 header you can solder to (see: https://docs.pycom.io/chapter/datasheets/downloads/pysense-pinout.pdf) When I connected it I used P8 and P4 which are availble on pins 9 and 10 of the external header. You will also need to connect to GND and 3V3_Sensor to the modules GND and Vdd pins.

@fsergeys said in Changing the GPS frequency and configuring which NMEA sentences the gps posts.: GALILEO and GALILEO Full satellites Do you know what the difference between the two is? Also I wonder what is the default configuration for the tracking system? I think the application note regardig I2c mentions to perform a dummy write after each command prior to get back to reading see my example here: https://forum.pycom.io/topic/2442/pytrack-and-gps-balloon-mode/3 and the sequence chart in the application note: http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf <- requires login. and here is the code to perform checksum testing yourself: requires the sentence to be a bytes object. def _checksum(self, sentence): l = sentence[0] for c in sentence[1:]: l = l ^ c return l def _test_checksum(self, sentence): if self._checksum(sentence[1:-3]) == int(sentence[-2:], 16): return True return False

sorry no clue, I am not using pycom devices anymore so I can't tell. Sorry.

@zceld I often see an issue like this when I have another atom window/tab open that is also connected to the same serial port. Can you make sure nothing else is trying to access the serial port?

@meirssv I've managed to construct a GPS tracker with a SiPy module. But I've use this gps lib ( https://forum.pycom.io/post/16183 ) from neuromistyx. Works great. because L76 is slow I've added a timeout of 3 minutes.

as @crumble say water level is probably not possible to mesure. If lat log is in pecision meters then you water level will be quite same.. Use different approach, there are many better ways for this task.

@jmarcelino Thanks for your respons, i figured as much but it is nice to have confirmation.

@gmaitre The 3.3 V output can supply up to 1 A current, so supplying a DHT22 and GPS module should not be a problem. The PyTrack board has an additional connector on the bottom, with some GPIO pins exposed, for instance P10 (G17) and P11 (G22). These could be used to connect the DHT22.

Hi @Xykon , Thanks for reply, that works for the PySense update! The Battery I am using is a 3.7v 2000mAh. Thanks Michael

Thank you for the links, but the antenna is external (on the PyTrack) so the datasheets do not contain any info about the antenna pattern.