indoor location tracking with ESP32

This project uses the same approach that I took for my ESP32 based indoor location tracking system (by tracking BLE signal strength). But this project came up with an actual user interface – NICE!

“Indoor positioning of a moving iBeacon, using trilateration and three ESP32 development modules. ESP32 modules report all beacons they see, to MQTT topic. Dashboard subscribes to this topic, and shows the location of beacons which are seen by all three stations.”

small and cheap multi-sensor nodes for home automation

I had reported on my efforts to develop an indoor location tracking system previously. Back in 2017 when I started to work on this I only planned to utilize inexpensive EspressIf ESP32 SoCs to look for bluetooth beacons.

In the time between I figured that I could, and should, also utilize the multiple digital and analog input/output pins this specific SoC offers. And what better to utilize it with then a range of sensors that also now could feed their measurements into an MQTT feed along with the bluetooth details.

And there is a whole lot of sensors that I’ve added. On a breadboard it looks like this:

So what do we have here:

  • Motion sensor
  • Temperature sensor
  • Humidity sensor
  • Light sensor
  • Barometric pressure sensor
  • and of course an RGB LED to show a status

The software I’ve done already and after 3 weeks of extensive testing it seems that it’s stable. I will release this eventually later in the process.

I’ve also found plastic cases that fill fit this amount of sensory over the sensor cases I had already bought for the ESP32 alone. For now I’ll close this article with some pictures.

The MQTT feed one of these nodes produces…

…and the Grafana dashboard I am using for this specific prototype device.