add influx 1 example

[hez]

This is similar to examples/C02_PM_SHT_OLED_WIFI but it pushes to an InfluxDB instead of Prometheus. Thought it might be helpful for others out there!

I made a few quality of life improvements line 40-41: defined the refresh rate for screen and push (don't want to push every 3seconds to the db).

Cheers

[danepowell]

Thanks, I ended up writing my own InfluxDB adaptation before running across this PR, it would have been nice to have out of the box.

In my implementation, I send a single point with multiple fields:

Point sensor("airgradient");
void loop() {
  sensor.clearFields();
  sensor.addField("pm2", PM2);
  sensor.addField("co2", CO2);
  client.writePoint(sensor);
}

I'm relatively new to InfluxDB, is there a reason to prefer using separate points as you did? Not sure of best practices. Regardless, it seems like it would be good to batch calls.

Edit: I made my implementation public: https://github.com/danepowell/AirGradient_Grafana/blob/master/AirGradient_Grafana.ino

[McJoppy]

Yep - the, one point is best :)

FYI the code in the example also sends a single point...

// matching constant type based off info from AirGradient.h
void sendInfluxData(const int pm2, const int co2, const float temp, const int humidity) {
  influxSensor.clearFields();
  influxSensor.addField("pm2.5", pm2);
  influxSensor.addField("co2", co2);
  influxSensor.addField("temperature", temp);
  influxSensor.addField("humidity", humidity);
  
  // Print what are we exactly writing
  Serial.print("Writing: ");
  Serial.println(influxClient.pointToLineProtocol(influxSensor));

  // Write point
  if (!influxClient.writePoint(influxSensor)) {
    Serial.print("InfluxDB write failed: ");
    Serial.println(influxClient.getLastErrorMessage());
  }
}

[airgradienthq]

I cannot merge this because we have now a complete rewrite of the library published. I also would like to keep the examples here lean and focused and not have too many options that could confuse people new to it.