A low energy open door detector with radio signals and MQTT

This blog post describes how I have set up a door-open detector at home. It uses a small ATtiny85 board that broadcasts a 433 MHz signal every time the door is opened. The signal is fetched by a Raspberry Pi that in turn publishes an MQTT message that results in the event being stored in... Continue Reading →


A web app for IoT data visualization

As described in someĀ earlier posts, I have a setup at home with IoT devices that publish measurement messages to a Raspberry Pi via MQTT. The RPi stores the data in a database and also forwards the messages to a cloud service (Adafruit IO). In this post I have made a self-hosted data visualization web app... Continue Reading →

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