ESPMobes – The Goals

This series about my home automation sensor nodes can also be seen on hackaday.io: https://hackaday.io/project/20588-espmobe-battery-powered-esp8266-iot-sensor

I like home automation a lot. For automation purposes data must be collected. I also like open software. But mostly I do like my own data not being on any strange servers outside my home.

So my goal is to design a sensor node to gather mostly useful data, that can be used to automate everything in my home (like lights, heating, blinds, media etc). They should speak MQTT, so I can easily integrate them in my home automation server (I use home assistant).

For my first tries I used NRF24l01-modules, they are cheap and have low power consumption, but you need an extra controller and a gateway to the host system. In the last years the ESP8266s showed up. Cheap, with Wifi, own microcontroller and a growing software environment and community. Great! But they are power hungry and bad for battery applications. But there are ways to deal with it – more of that later ;)

Let’s summarize my objectives for this project.

  • Battery powered (battery life better than 6 months)
  • PIR sensor
  • Ambient light sensor
  • Temperature and humidity
  • Not that expensive
  • Small form factor

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