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humidity-probe-influxdb

An ESP32 program that collects sensor data from up to two BMx280 or AHT20 sensors and saves it to a time series database such as InfluxDB or Victoria Metrics.

Supported sensors

  • AHT20 (temperature and humidity)
  • BME280 (temperature, pressure and humidity)
  • BMP280 (temperature and pressure)

Features

  • Performs measurements every 60 seconds (customizable)
  • Intelligent sync: send data to the time series database after
    • a given number (default: 20) of measurements has been taken.
    • a significant change in temperature (default: +/- 1°C) or humidity (default: +/- 2%) has been detected.
    • decreases sampling rate, if the cache runs full.
  • Automatically detects the sensor type (BME280 or BMP280) and the sensor's I2C bus ID.
  • Minimize power consumption by
    • disabling Bluetooth
    • putting the ESP32 into deep sleep mode between measurements
    • caching a customizable number of results prior to transferring them to the time series database.
  • Synchronize the time with a time server after a specified amount of minutes.
  • Reliability: the program caches measurements, if either the InfluxDB database or WiFi are not available.
  • Supported time series databases:
    • InfluxDB
    • Victoria Metrics

Required Libraries

Tutorial

The following tutorial summarizes the steps required for setting everyting up.