For a long time now we were planning to build something which uses LoRa technology. For one of our coming project we needed to create a Proof of Concept to test various available components from the market. What can be more useful for validating range specifications then a GPS Tracker which bring all this together. This is why we built this LoRa Gateway GPS Tracker.
Process of building and testing:
First we built two unit using the E220 modules to test the example codes we found on the internet. Luckily as expected there were a tons of example. wiring diagrams, video tutorials about the topic. The issue we ran into that some schematics were not correct and it took a while to realize that this is not our fault. One of our main information source was : mischianti.org . As it is mentioned several places you need to be careful when “marrying” microcomputers on different voltage levels on their I/O interfaces. In one of our dis-assembly phase during debugging and error chasing phase we accidentally missed a voltage regulator between an Arduino Uno and the E220 module which has a very bad result on the module life cycle. R.I.P. e220 module! We also realized we need more test breadboard as they speed of a POC cycle a lot. When you work with Wemos mini, mini pro or with D1 models it makes it more easy as their communication voltage level is 3.3V.
Please also keep in mind that these communication modules transmit in various frequencies with adjustable transmission power so be aware of the local regulations!
That was our first part for LoRa Gateway GPS Tracker as the range test will be published in a separate blog entry whenever the weather makes it possible.
