wifi_lux_sensor/wifi_lux_sensor.cpp

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <Wire.h> 

#include "config.h"
#include "Adafruit_TSL2561_U.h"

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

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

Adafruit_TSL2561_Unified tsl = Adafruit_TSL2561_Unified(LUX_ID, 12345);

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\r\n");
  connectWifi();
  Wire.begin(4, 5); // sda on pin D2, scl on pin D1

  tsl.begin();  // Startup the sensor

  Serial.println("Setup TSL2561");
  tsl.setGain(TSL2561_GAIN_1X);
  tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_101MS);
  tsl.enableAutoRange(true);
}

uint32_t readLuxSensor(void)
{
  uint16_t broadband;
  uint16_t ir;
  
  tsl.getLuminosity(&broadband, &ir);
  uint32_t lux = tsl.calculateLux(broadband, ir);
  Serial.printf("Lux:%u\n", lux);
  if( lux > 65000 ) lux=65000; // Set a maximum value
  return lux;
}

void sendToHTTPServer(uint32_t lux)
{
    HTTPClient http;

    Serial.print("[HTTP] begin...\n");
    // configure traged server and url
    // The target web page is: http://chef.suka.se/nashulta/report_nashulta_temp.php?outtemp=10.3
    String str = "http://chef.suka.se/nashulta/report_nashulta_temp.php?outtemp=";
    str += lux;
    http.begin(str);

    Serial.print("[HTTP] GET...\n");
    // start connection and send HTTP header
    int httpCode = http.GET();

    // httpCode will be negative on error
    if(httpCode > 0) {
        // HTTP header has been send and Server response header has been handled
        Serial.printf("[HTTP] GET... code: %d\n", httpCode);

        // file found at server
        if(httpCode == HTTP_CODE_OK) {
            String payload = http.getString();
            Serial.println(payload);
        }
    } else {
        Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }
}

void waitUntilNextLoop() {
  const uint32_t now = millis();

  const uint32_t sleep = (((now / 10000)+1)*10000) - now;

  delay(sleep);
}


void loop() {

  static uint32_t totalLux = 0;
  static uint16_t loopCnt = 0;

  Serial.print(millis());
  Serial.println(" mS ------------------");

  const uint32_t lux = readLuxSensor();

  totalLux += lux;

  loopCnt++;

  // Once every minute, calc mean lux and send to server.
  if( loopCnt == 6 ) {

    totalLux /= 6;
    loopCnt = 0;

    sendToHTTPServer( totalLux );
  }

  // Reset the device once every day, as an extra precaution
  if( millis() > (1000*60*60*24) ) {
      Serial.println("Reseting.....");
      ESP.reset();
  }
 
  waitUntilNextLoop();
}