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The spec sheet for the radio module says it is a HSPA and 2G module, HSPA is "3G". So yes this should continue to work assuming that the local 2G network runs on one of the supported frequency bands. …

It's not really clear what you are asking here, but if you mean can you use ultrasound to measure the distance to the surface of water then the answer is yes. Ultrasound range finders are regularly u …

The difference is the types of radio hardware each has. Argon - Has a WiFi (802.11) + Bluetooth 5 radio Boron - Has an LTE cellular + Bluetooth 5 + Zigee radio Xenon - Has Bluetooth 5 + Zigbee radi …

You need to add the whole git project as a library, then include the header file. The header file is just the list of function names and constants, with out the corresponding cpp file there is no actu …

To answer your fist question I'll point at this Ask Ubuntu answer: https://askubuntu.com/questions/14558/how-do-i-setup-a-local-ntp-server It's Ubuntu specific but should point you in the right dire …

Given the low number (20) of devices then you might be able to get away with just set of different resistors. If you use more than 1 path then this could be a combination of resistors (e.g. path 1 10 …

These systems work by having the device connect out from your home network to the a server run by the service. This outbound connection is bi-directional so the server can send commands back "down" t …

The keepalive value is sent to the broker as part of the connection request. The broker uses this value to start a timer with that value that starts counting down. Every time the client sends a packe …

An SMS message has a maximum size of 160 chars. While modern devices will allow you to send what look like longer messages they are just multiple messages that the devices concatenate together when re …

You are always going to need to be read from the card to be able to make pretty much any normal filesystem work, even if just to read the file allocation table to work out which sectors are free to wr …

As mentioned in the comments... Assuming the controller has a button that will trigger the gate to open then you just need to find a way to "press" that button. The simplest way is probably to attac …

You don't "flash" software to a pi in the same way you do a micro controller based device. You can easily update software OTA (over the air) to a Raspberry pi, just by copying the files to the device …

First, if you just have 1 garage door opener, why are you generating a random client id every time? using a fixed clientID would be the right thing to do here. The only time a random clientID makes an …

Building your own device for this use case really is the wrong approach. The industrial design to build something that will survive day to day use and be comfortable to wear with a useable battery l …