esp8266_bmp280_si7021_mqtt.ino

#include <MQTT.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include "Adafruit_Si7021.h"

#define PUB_INTERVAL 30000

unsigned long lastPublishMillis = 0;

Adafruit_BMP280 bme;
Adafruit_Si7021 si7021 = Adafruit_Si7021();
WiFiClient net;
MQTTClient client;

void setup() {
  // Serial.begin(115200);
  if (!bme.begin(D3, D4)) {  
    // Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
  if (!si7021.begin(D3, D4)) {
    // Serial.println("Did not find Si7021 sensor!");
    while (true);
  }
  WiFi.begin("*", "*");
  while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      // Serial.print(".");
  }
  // Serial.println(WiFi.localIP());
  client.begin("192.168.1.125", net);
  while (!client.connect("ESP8266")) {
    // Serial.print(".");
    delay(1000);
  }
  // Serial.println("MQTT Connected");
}

void loop() {
  client.loop();
  if (lastPublishMillis + PUB_INTERVAL < millis()) {
      lastPublishMillis = millis();
      client.publish("home/temperature1", "{ \"value\": " + String(bme.readTemperature()) + ", \"unit\": \"C\" }");
      client.publish("home/temperature2", "{ \"value\": " + String(si7021.readTemperature(), 2) + ", \"unit\": \"C\" }");
      client.publish("home/humidity2", "{ \"value\": " + String(si7021.readHumidity(), 2) + ", \"unit\": \"%\" }");
      client.publish("home/pressure2", "{ \"value\": " + String(bme.readPressure() * 0.00750062) + ", \"unit\": \"mmhg\" }");
      client.publish("home/altitude", "{ \"value\": " + String(bme.readAltitude(1013.25)) + ", \"unit\": \"m\" }");
      // Serial.println("T1: " + String(bme.readTemperature()) + " T2: " + String(si7021.readTemperature(), 2) + " H: " + String(si7021.readHumidity(), 2) + " P: " + String(bme.readPressure() * 0.00750062) + " A: " + String(bme.readAltitude(1013.25)));
    }
}