Internet of Things: LoRa Weather Station

This is an example of a nice LoRa project. The weather station contains a temperature sensor, air pressure sensor and humidity sensor. The data is read out and sent to Cayenne Mydevices and Weather Underground using LoRa and The Things Network.

Check if there is LoRa Gateway of the The Things Network in your area!

For this project I used the following hardware:

• Arduino Pro Mini 328 - 3.3V/8MHz (https://www.sparkfun.com/products/11114)
• RFM95W (http://www.hoperf.com/rf_transceiver/lora/RFM95W.html) (https://www.aliexpress.com/item/RFM95W-20dBm-100mW-868Mhz-915Mhz-DSSS-spread-spectrum-wireless-transceiver-module-SPI-SMD/32799536710.html)
• DHT22 (https://www.aliexpress.com/item/High-Precision-AM2302-DHT22-Digital-Temperature-Humidity-Sensor-Module-For-arduino-Uno-R3/32759158558.html)
• BME280 (https://www.aliexpress.com/item/I2C-SPI-BMP280-3-3-BMP280-3-3-Digital-Barometric-Pressure-Altitude-Sensor-High-Precision-Atmospheric/32775855945.html)

Total costs less than 10 dollars.

It is wise to first test the sensors on a breadboard. So you can be sure that the sensors works. You can also measure the power consumption with a multimeter. (Use the Low-Power lib to measure the minimum)

First solder wires to the RFM95W module and then solder them to the Arduino Pro Mini. Then add the sensors. View the images and the diagram!

To place the weather station somewhere, I drew a case and printed it with the 3d printer.

The models can be found on Thingiverse. Of course you can of course make your own variant. https://www.thingiverse.com/thing:2594618

The code I have used can be found on GitHub: https://github.com/henri98/LoRaWanWeatherStation

I used Atom with PlatformIO to realize this project, so this is a PlatformIO project. I used the folowing libarys:

• LoraMAC-in-C for Arduino thank to Thomas Telkamp and Matthijs Kooijman (https://github.com/matthijskooijman/arduino-lmic)
• CayenneLPP of The Things Network Arduino Library (https://github.com/TheThingsNetwork/arduino-device-lib)
• Adafruit DHT Humidity & Temperature Unified Sensor Library (https://github.com/adafruit/DHT-sensor-library)
• Low-Power: Lightweight low power library for Arduino (https://github.com/adafruit/DHT-sensor-library)

You can integrate your application in The Things Network with Cayenne myDevices

To add the integration:

• Go to the application console on The Things Network website;
• Select integrations from the top-right menu;
• Select Cayenne;
• Follow the instructions

To send data to Weather underground, create an HTTP integration. The data will be sent to the URL with a POST or a GET. The following script captures the data and sends it to Weather Underground. Register your own Personal Weather Station on https://www.wunderground.com/personal-weather-station/signup

<?php
echo time();
file_put_contents('json/post'.time().'.json', file_get_contents('php://input'));
$json = file_get_contents('php://input');
$data = json_decode($json);
// take the data out of the json
$temperature_1 = $data->payload_fields->temperature_1;
$barometric_pressure_2 = $data->payload_fields->barometric_pressure_2;
$relative_humidity_3 = $data->payload_fields->relative_humidity_3;
// tempc to tempf
$tempf = ($temperature_1 * 9/5) + 32;
// pressure 
$pressure = $barometric_pressure_2/33.863886666667;
if( isset($pressure) && !empty($pressure) && isset($tempf) && !empty($tempf) && isset($relative_humidity_3) && !empty($relative_humidity_3)){                file_get_contents("https://rtupdate.wunderground.com/weatherstation/updateweatherstation.php?ID=XXXXXXX&PASSWORD=XXXXXXXX&dateutc=now&tempf=" . $tempf . "&humidity=" . $relative_humidity_3 . "&baromin=" . $pressure);
}
?>

Enjoy Your Weather Station

In Cayenne myDevices you can share a project Dashboard. Share yours in the comments!

This is mine: https://cayenne.mydevices.com/shared/59e9c7612d218c587ba531c4