I have a talent to forget to cover my car before a night with temperature below zero and the next morning I have to scratch away all the ice. As I really don’t like that I decided to build a warning mechanism for that. I already had a Node-RED flow querying the weather API to…
Precondition: Have your lokal MQTT broker and Node-RED installed and setup or access to a remote one. I recently added a http request node querying a weather API to Node-RED. After extracting, the current temperature is then published on the local MQTT and can be used by all devices connected to the broker.In this example…
A little util to map direction angle from weather API to ‘NW’ (SHORT, default) or ‘north west’ (LONG). Supports english (default) and german. An example API call to the weather API I am using and mapping the current wind direction to readable format. All my weather related code at github https://github.com/worksonmymachine-de/weather.
Just wanted to let you know I wrote a little mapper / translation for WMO weather codes as the (free) API I use for current weather and forecast also provides it. An example API call to the weather API I am using and mapping the current weather code to readable format. The code is on…
TLDR: An IoT sensor for temperature and humidity sending its values to a local MQTT server. Measuring interval and thresholding easy to configure. So much to write about a pretty small device and less than 100 lines of code including configuration, prints and comments. Hope you enjoy it! 🙂 I really like building and writing…
TLDR: Measures temp&hum in a configurable interval and with variable thresholds. Publishes to a mqtt server. Neopixels react to json data at a mqtt topic it is configured to subscibe. Single thread async implementation. Robust wifi and mqtt routines. Code at my github: https://github.com/worksonmymachine-de/iot_temptumsensor_ambilight This device is placed behind my main monitor and reads temperature…
It measures the temperature, humidity and open status of a window and send the values to the local MQTT broker if the values have changed (enough). The D1 got a nice housing on a solderable breadboard. The sensor cables can be plugged and unplugged into sockets on the breadboard. So I can easily exchange the…
This sounds trivial – and it is. When you know how to do it 🙂 There’s an example on the Node-RED homepage splitting a message generated from CSV, but this isnt the case here. I somehow did miss the point – if there is one made in the documentation – of how to split a…
Most code for simple IoT devices is a script with an endless loop with the code for the connected hardware like reading a sensor or polling something from the network followed by a delay. Keeping that pattern in mind helps to write new or convert your existing code for asynchronous execution. If you want to…
a.k.a. longest post title ever 😛 This is the Python code for a NodeMCU v3 running MicroPython 1.19.1. It will measure temperature and humidity at the connected DHT22 with breakout board every 30 seconds, connect to WiFi and publish to a MQTT server.The first code block will be the necessary as simple and clear as…
TLDR: Code for MAC address in (Micro)Python and C++ for D1 Mini, Raspberry devices and NodeMCU. I was looking for a unique static identifier to handle my IoT devices without baking the mqtt publish topics, name and location into the code. The code on identical devices should be the same, the the individual configuration should…
My first NodeMCU v3 board. Connected a DHT22 (includes PCB with breakout board) to 3V, ground and data pin to D1 (which is Pin 5). Kept Python code for measuring loop as simple as possible. You will find a fitting pinout at RandomNerdTutorials. This code measures the temperature and humidity every 30 seconds and prints…