ESP32 Weather Station

Espressif ESP32 and I2C environment sensors to gather Temperature, Humidity and Pressure data. The data points gathereed are posted to an InfluxDB running in Intranet.

Common Features

1. Connects to WiFi using a static IP to minimize awake time
2. Automatically syncs with SNTP server to post with accurate epoch time
3. Uses very accurate calibrated ADC to monitor the battery connected, and prevents overdrain (cut off at 3.4V)
4. Configurable sampling frequency
5. Posts all measured values to InfluxDB (provided a DB named environment is pre-created), which can be easily visualized with grafana with provided templates.

Hardware

1. Adafruit Huzzah32 feather
2. Nokia BL-5C Li-ion Battery 1020mAh 3.7V
3. HTU21D or BME280 weather sensors

Software stack

1. Espressif Arduino

SHT21/HTU21D for Temperature, Humidity

The HTU21D aka. SHT21 is a I2C digital Temperature / humidity sensor with a typical accuracy of ±2% with an operating range that's optimized from 5% to 95% RH, temperature output has an accuracy of ±1°C from -30~90°C.

BME280 for Temperature, Humidity and Pressure

BME280 is precision multi sensor from Bosch for measuring humidity with ±3% accuracy, barometric pressure with ±1 hPa absolute accuraccy, and temperature with ±1.0°C accuracy