A project that logs temperature, humidity, and pressure data from a BME280 sensor to an InfluxDB database using an ESP32 Microcontroller.
Written in C++ using the Arduino core with PlatformIO.
A config.json file located in data/ need to fit the following format:
{
"ssid": "<wifi_ssid>",
"password": "<ssid_password>",
"url": "<influxdb_ip)>", // no http://
"port": <influxdb_port>,
"endpoint": "/api/v2/write?org=<org>&bucket=<bucket>", // replace <org> and <bucket>
"influx_api_key": "xxxxxxxxx"
}The ESP32 uses a custom filesystem called SPIFFS, which doesn't work with standard C++ I/O.
The filesystem needs to be built using the current directory structure state. The PlatformIO tasks Build Filesystem Image followed by Upload Filesystem Image are necessary when adding or editing a non-src/ file, such as config.json.
115200 bits-per-second is used as the baud rate. This is set in main.cpp using Serial.begin(115200), and also configured in platformio.ini to allow serial monitoring via VS Code with PlatformIO tooling.