https://www.hackster.io/pulsartronic/diy-smartphone-lora-connection-bde258

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DIY Smartphone LoRa ConnectionDIY Smartphone LoRa Connection

Here's how to connect your phone to a LoRa module using standard
components you can buy everywhere, along with an example chat
program.

Read up about this project on Hackster.io

DIY Smartphone LoRa Connection

pulsartronic
45 23,158

  * Overview
  * Things
  * Story
      + Step 1: Hardware
      + Note about the PCB, there are 2 options, left or right
      + Step 2: Software
      + Android app Interface Configuration
      + Step 3: Custom App
  * Schematics
  * Code
  * Credits
  * Comments(16)

pulsartronic
pulsartronic
Published October 23, 2020 (c) GPL3+

DIY Smartphone LoRa Connection

Here's how to connect your phone to a LoRa module using standard
components you can buy everywhere, along with an example chat
program.

IntermediateFull instructions provided2 hours23,158
DIY Smartphone LoRa Connection

 Things used in this project

Hardware components

               USB RFM App Components x 1  

               Large cross board PINs x 1  

               PCBWay PCB Board A     x 1  

               PCBWay PCB Board B     x 1  

Software apps and online services

Arduino IDE    Arduino IDE                 

Android Studio Android Studio              

 Story

This project will help you create a connection between your phone and
a LoRa module using the USB port and an Arduino Lilypad USB. There is
an example chat app for point to point communication, and, you can
modify it to make even a TTN sensor out of a smartphone :)

Find us on Twitter

Step 1: Hardware

You can find all hardware elements here, or listed above.

  * USB RFM App Components
  * PCB Board A
  * PCB Board B

You can chose between these two Atmega32U4 3.3v 8MHz models, although
the black one seems to be a little bit better, the blue one stops
working sometimes with my black phone ...

It is important to use OTG cable adapters

Note about the PCB, there are 2 options, left or right.



Choose one depending on what side you want to solder your chips

Since it is going to be in touch with your phone, I make use of a
sandpaper and transparent tape to make it smoother and protect it
from short circuits

there actually is transparent tape covering the contacts :)

Step 2: Software

Now you have to setup the Arduino IDE, note that you can use any
other framework you like. It is not difficult but you have to do one
or two things in order to compile the project.

Code is hosted in github.com,it is open source, feel free to
contribute, reporting bugs or making suggestions would be great :)

Download it and open:

ArduinoIDE/USBRFMApp/USBRFMApp/USBRFMApp.ino

Change Sketchbook location under file --> preferences

If needed add additional boards under file --> preferences... I've
been using:

https://adafruit.github.io/arduino-board-index/package_adafruit_index.json

Select your board under tools --> Board

It should now compile.

Now open:

ArduinoIDE/USBRFMApp/USBRFMApp/Defaults.h

Change the default values if needed, they are in hexadecimal, I hope
you can handle them, upload it to your board and configure it using
the android app.

Android app Interface Configuration

Once it is all connected you can open and configure your device using
the app located at.

USBRFMApp/USBRFMApp.v1.apk

You can use that one, compile one yourself or download it from Google
Play Store

It could be possible to connect your browser directly to the USB port
using the Web Serial API, but at this time it is not mature enough
and it does not work with phone browsers, that's why you have to use
an Android app to access your USB port, it maybe changes in the
future

The example chat program sends and receives encrypted messages using
AES-256-CBC, the key depends on what room is configured under
settings, use some secret room name for privacy, the same have to be
configured in every device you want to chat with ... It is pretty
easy...

Step 3: Custom App

If you want to get rid of the chat system and read/write raw bytes
from/to the RFM module open the Android Studio Project, edit the
following file and add your logic.

AndroidStudio/USBRFMApp/app/src/main/assets/USBRFMApp/app/App.js

I hope it is clear enough

Find us on Twitter

Read more

 Schematics

USB RFM App

 
[screenshot]

 Code

USB RFM App

 

 Credits

pulsartronic

pulsartronic

3 projects * 20 followers
I actually live in Mordor but they don't let you say it ...
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 Comments

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