Tiny House temperature monitoring using Node-RED and LoRa

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Overview

  • In this lesson - temperature and humidity data from a Tiny House was collected using a Pycom LoPy4 and transmitted to a local LoRa WAN Gateway
  • The data was processed in The Things Network
  • The data was subscribed to using MQTT using Node-RED
  • A time stamp was added simple time node
  • The data was processed using a process node to extract out temperature data
  • The data was then packaged so that it cold be dweeted.
  • The data will be available to students as a Dweet so that they can monitor the performance of their tiny house
  • Students will use Python to process the dweeted data (Dweepy module)

Node-RED Configuration

mqqt-in Node

mqqt-in edit Node - Connection

  • Follow the example below to configure the connection to the MQQT broker on The Things Network

mqqt-in edit Node - Security

  • Follow the example below for the security configuration.
  • Note that the username is whi-tinyhouse-12-temperature-pycom@ttn
  • Whereas the password is a very long chanracter set (40+ characters) obtained from the The Things Network Application page.
  • For security reasons, Node-RED will not retain any passwords if the node is copied.

simpletime Node

  • simpletime adds time and date stamps to the data flow within Node-RED.
  • The simpletime node needs to be added to Node-RED using the Manage pallet function.

  • Example of default configuration of simpletime node.

function Node

  • The function node is used to process data flows in Node-RED.

  • In this example the function node is used to:
    • Extract temperature, humidity and battery data from the mqtt in data feed
    • Then assign the data to variables
    • And finally, dweet the data so that the data is available to students on the internet.

  • Code reproduced below.
  • Add your own unique dweet address to the code.
  • The dweet address also requires the question mark symbol at the end - <My_Dweet_address>?
var battery; // battery voltage data
var int_humidity; // humidity data from within the sensor housing
var ext_temp; // external temperature data
var int_temp; // temperature data from within the sensor housing

battery = msg.payload.uplink_message.decoded_payload.bat;
int_humidity = msg.payload.uplink_message.decoded_payload.humid;
ext_temp = msg.payload.uplink_message.decoded_payload.onewire_temp;
int_temp = msg.payload.uplink_message.decoded_payload.temp;

msg.payload = "bat=" + String(battery) + "&"
    + "intHumid=" + String(int_humidity) + "&"
    + "extTemp=" + String(ext_temp) + "&"
    + "intTemp=" + String(int_temp) + "&"
    + "date=" + String(msg.mytimes);

msg.url = "https://dweet.io/dweet/for/<My_Dweet_address>?" + msg.payload;

// check dweet with - https://dweet.io/get/latest/dweet/for/<My_Dweet_address>
return msg;

http request Node

  • The http request node is able to Dweet the data package using the POST http operation.

  • The configuration of the http request node is shown below.
  • The node has been named dweet tiny house 12 data (name is lower down in node edit window - not shown).

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