for Raspberry Pi GSM/GPRS/GNSS Bluetooth HAT Expansion Board GPS Module SIM868 Compatible for Raspberry Pi 2B 3B 3B+ 4B Zero Zero W Support Make a Call,Send Messagess,Data Transfer

Awesome board. I was able to get it to work with both Raspberry Pi Zero and Arduino Nano. I was able to power it up without having push the button on both Pi and Arduino. Support gave a sample code for RPi and I used the similar code with Arduino and it worked. GPS fix is incredibly accurate. I'm using it with T-Mobile phone SIM and worked with no issues.

Be forewarned, this is made in China so the documentation on it is horrible. The only script that works from Waveshare is the PWRKEY script to turn it on and off. The scripts for SMS and phone calls don't work. It takes longer than the stated "3-5 minutes" for the GPS to get a fix; at least in Hawaii. The documentation to download and get the EPO file for GPS doesn't work or assist in speeding up GPS fix time. Currently using a Tracfone prepaid SIM that works on a phone for calls, SMS and data connection up to LTE.

The modem works very well . the problems I see are the following:1) When you use it in a raspberry pi all the headers pins are useless so you can works only with the modem . You can not connect other device to the raspberry pi.2) The SIM868 is outdated.3) Documentation is really bad.

Followed the wiki instructions to the tee, and tried it a couple of ways.To my PC - it sees the com port but doesn't respond to AT commandsthrough my Raspberry Pi - same story - the Raspi sees the CP102x USB but won't respond to AT commands.I asked a question here but it got disappeared. I will be returning this product for the Adafruit Fona.Signed,Top home automation contributor on AmazonDegreed electrical engineer with 30 years experience.

I had written up a much more detailed response but apparently I can't include links to things like their datasheets/etc.I was able to use nodejs to interact with the GPS, I can't speak to the GSM capabilities (I haven't tried sending a text message/etc).I really didn't have a ton of issues with it, but overall it works, I use it to track GPS and feed into a tool I have for road trips. This replaced a janky setup with my android phone sending GPS to a server, to do this work.

I attached the GPS antenna and found because I needed the wire to come off the device at a different angle. When I tried to detached the antenna, the solder holding the antenna attachment port broke and the port came right off. I attempted to repair it, but the solder points were far to small for my tools. I expected I little more.The documentation for how to configure the raspberry pi relative to the hat's pin configuration was not clear (I was trying to capture the PPS signal from the GPS).If the seller tells like helping me out with the repair or replacement, that would be reasonable... we'll see what happens.

In USA. T-Mobile 3 for 30 prepaid sim ($3 for up to 30 minute/texts a month, not 30 of both)Got running in minutes on a Mac before playing with the Pi.Used CoolTerm to check from coms and get the CSCA # (just issue a at+csca? and it will display it)Then modified the sample send_text program (with CSCA, my cell# and the correct serial port) to send to my phone.Worked fine! Was expecting a full day of pulling whats left of my hair out.Think I struggled most with the stupid little adapters to make it a full size sim.Now that it does what I got it for off to play with the rest. (only gave 4 stars since I haven't played with the other features.)

This is just a play project to see what the capabilities are. Thinking about interface for AutoPI or some sort of automotive application. A little tough getting connected. Pertinent info is at end of document