This is actually a test of using StackEdit.io to create blog posts directly.

Here is a photo of my Arduino Uno R3 with a DHT22 temperature and humidity sensor.

As it is not WiFi enabled, it uses USB serial (emulation) to output the temperature and humidity with standard print statements. Then, with Node-Red running on Debian Buster (via crouton on a Chromebook), it uses MQTT to send the data to io.adafruit.com. Here is the flow:

At Adafruit IO I created a “dashboard” to display the data: https://io.adafruit.com/keithehenry/dashboards/humidity-and-temperature

Credit to Andreas Spiess for the inspiration. “Cool.”

Written with StackEdit.