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A DIY Outdoor LoRaWAN Gateway with Battery Backup

An easy to make, cheap gateway made from basic components. RPi3B+, RAK2245, IP67 enclosure, batteries, some power converters and more. ;)

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A DIY Outdoor LoRaWAN Gateway with Battery Backup

Things used in this project

Hardware components

RAKwireless RAK2245 Pi HAT
Our concentrator, the brains of the operation that has the RF components required to listen to 8 channels simultaneously (as per LoRa Alliance recommendation).
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Raspberry Pi 3 Model B+
Raspberry Pi 3 Model B+
The heart that is going to be driving that nice RAKwireless brain in order to get the received LoRa Frames and pump them to the LoRa Network Server (we love open platforms so we are using TTN, mostly).
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DC/DC Converter
You can use any DC/DC converter with parameters similar to the ones in the link. We have used this one as it is quite cheap and suits out needs. Nothing crazy, the current drain is well below the 5A that it provides and the voltage is within our desired range.
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RP-SMA connector
We need 2 of these as we got one GPS and one LoRa Antenna that need to be connected
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18650 Battery
We have used 3 (the design fits 4) of those, as we are not seeking autonomous life of the gateway, simply a backup option for an hour or two. Feel free to experiment with the number and capacity of the batteries.
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18650 Battery holder
Again, we have 2 as we want to fit 4 batteries, adjust as per your build.
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Voltage regulator
We need this for the Battery charging and discharging circuitry
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Single Sided PCB
This is going to act as a base to build upon and it will be screwed to the back-plate of the case.
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PoE splitter
AS one can guess we will separate the Ethernet connection for the data from the Supply for the Raspberry pi as we are going to power the setup with a PoE Injector.
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PoE Injector
The aforementioned injector. We need a 24V rated one.
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Casing (IP67 rated)
This is what we used and we like how it came together. It is a leftover from a CCTV box. It has very robust build and ingress protection is great, plus these are really cheap and lots of people sell them second hand or even like new.
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SMA male to N-type Female connector (1 meter)
This is going to be used for the LoRa Antenna as we are going to use a decently sized one and with grate gain comes grate N-type sized connectors 😊. By the way this is the antenna we are using from RAKwireless (5.8 dBi antenna)
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Waterproof Cable Gland
As we want to preserve the IP67 rating when we insert the power and network cable from the PoE Injector.
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Software apps and online services

Raspbian
Raspberry Pi Raspbian
ChirpStack

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Solder Wire, Lead Free
Solder Wire, Lead Free
Miscellaneous
Screws, Duck tape, Wires, a Micro USB cable, glue, etc. These are things that almost any maker has in copious amounts so we are not adding them to the costs.

Story

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Credits

Nikolai Manchev

Posted by IoT4Green

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