Show HN: Create an IoT Environmental Sensor with NodeMCU and Lua (blog.alexellis.io)

4 comments

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Did a similar thing. MQTT broker and small node server to include current values. It's not generalized and tuned, but could be a nice starting point. https://github.com/martinlechner1/raspberry-node-mqtt

alexellisuk 8y ago ↗

That looks awesome too. I used InfluxDB with my Raspberry Pi variant and plotted the data in graphs - https://blog.alexellis.io/environmental-monitoring-dashboard...

This can be combined with the NodeMCU units which I think are better suited for low-powered data-logging than the RPi.

joshu 8y ago ↗

Super useful.

Have you worked out how to run for a long time from a smallish battery?

alexellisuk 8y ago ↗

I'm running 4 of these sensors right now and I am just using the small free-gift type of USB power packs. They are lasting several days without using deep sleep optimizations.

In the next post I'll show how to aggregate the data into InfluxDB for charting.