Connection a light sensor to ESP8266 and displaying the readings at easy-iot cloud

Setup the board

Todo: fritzing diagram

• connect node-mcu to mac
• 3.3v to a 10K resister
• resister to light-sensor & to A0
• GND to light-sensor

Connecting to wifi

    WiFi.mode(WIFI_STA);
    WiFi.begin("nereusiphone", "ajit1234");

    Serial.print("Connecting");
    while (WiFi.status() != WL_CONNECTED)
    {
    delay(500);
    Serial.print("y");
    }
    Serial.println();

    Serial.print("Connected, IP address: ");
    Serial.println(WiFi.localIP());
    Serial.print("MAC: ");
    Serial.println(WiFi.macAddress());

Connecting to a service

arduino’s wifi client lib provided this impl to connect to any external service and later print messages to it, this is just an example.

    WiFiClient client;
    while(!client.connect("echo.websocket.org", 80)) {
    Serial.println("connection failed..!!!");
    delay(2000);
    }
    Serial.println("connection success..!!!");

More detailed example

Easy iot library used to connect to wifi and easy iot cloud

EasyIoT-Cloud@github

Replace constants:

‘#define WIFI_SSID “nereusiphone”’

‘#define WIFI_PASS “ajit1234”’

‘#define TOKEN “5SpmyUqPgNWGBEMS3bGI5J6rXDwAtW4FRCRZvkcN”’

To start with set existingModuleId to 0 this would create a new module

uint existingModuleId = 0; 

loop()

Here we read the sensor value from analog pin A0 and push to easy iot cloud

  sensorValue = analogRead(SENSOR_PIN);
  float level = 100 - ((sensorValue - MIN_VALUE) * 100 / (MAX_VALUE - MIN_VALUE));
  sensorValue = level;
  Serial.println("LUX = ");
  Serial.println(sensorValue);

  bool valueRet = eiotcloud.SetParameterValue(parameterId, String(sensorValue));
  Serial.println("SetParameterValue: ");
  Serial.println(valueRet);
  delay(1000 * 10 * REPORT_INTERVAL);