wifi_lux_sensor/wifi_lux_sensor.cpp

#include <ESP8266WiFi.h>
#include <Wire.h> 

#include "config.h"
#include "Adafruit_TSL2591.h"

// ----------- DEFINES ---------------
#define LUX_ID 0x39     // I2C-Id of the lux-sensor

// ----------- GLOBALS ---------------
WiFiClient espClient;

Adafruit_TSL2591 tsl = Adafruit_TSL2591(2591); // pass in a number for the sensor identifier (for your use later)

void connectWifi() {
  WiFi.disconnect(false);
  Serial.printf("Wi-Fi mode set to WIFI_STA: %s\n", WiFi.mode(WIFI_STA) ? "Ok" : "Failed!");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  Serial.print("Connecting to ");Serial.println(WIFI_SSID);
  
  while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(WiFi.status());
      Serial.print(".\r\n");
      //WiFi.printDiag(Serial);
  }
  
  Serial.println("");
  Serial.print("Connected with IP: "),
  Serial.println(WiFi.localIP());
  Serial.printf("\n");
}


void setup() {
  Serial.begin(38400); //Opens USB-Serial connection for terminal
  delay(1000);
  Serial.println("Init of WiFi-Lux-sensor project");
  connectWifi();
  Wire.begin(4, 5); // sda on pin D2, scl on pin D1

  tsl.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  byte error, address;
  
  Serial.print("WiFi heartbeat - ms since boot: ");
  Serial.print(millis());
  Serial.println();

  Wire.beginTransmission(LUX_ID);
  error = Wire.endTransmission();

  if (error == 0) {
    Serial.println("I2C-Lux device found");
  }
  else if (error==4) {
    Serial.println("--Unknown error.");
  }    

  Serial.println("done\n");
 
  delay(1000);
  
}