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added README.md

FloKra 1 year ago
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+## HomeServerIOExt
+
+When migrating my home control server from a Raspberry Pi to x86 hardware I needed an interface to connect some sensors (door contact, PIR sensors, temperature sensor) 
+which were previously connected to the RPi´s GPIOs. 
+
+This simple solution consists of an Arduino Nano which is connected to the host via USB and a daemon written in Python which publishes the states over MQTT. 
+
+The Arduino reads the sensors/IO-Pins and sends state changes via Serial. 
+The Python program runs as a daemon, receives the serial data and sends values/states to an MQTT broker.