Project program code

The Arduino.cc software was used to write the program.

 

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// IoT_BFU                        //

// Access sensor sends data //

// In Adafruit IO Cloud Database //

////////////////////////////////////

//   Enable Adafruit IO libraries and network connectivity

#include "Adafruit_MQTT.h"

#include "Adafruit_MQTT_Client.h"

#include <WiFi.h>

 

int  i;  // Variable in which we will store the values ​​from the sensor

// Define Adafruit IO connection parameters

#define AIO_SERVER      "io.adafruit.com"

#define AIO_SERVERPORT  1883

#define AIO_USERNAME  "IoT_BFU"

#define AIO_KEY       "aio_vbEQ73TLu64IPZXfgIMzxxxxxxxxxx"

WiFiClient client;

 

//   Adafruit IO connectivity block

Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

 

boolean MQTT_connect();

 

boolean MQTT_connect() {

int8_t ret;

if (mqtt.connected()) {

return true;

}  uint8_t retries = 3;

while ((ret = mqtt.connect()) != 0) {

mqtt.disconnect();

delay(2000);

retries--;

if (retries == 0) {

return false;

}

} return true;

}

// Adafruit IO contact feature and indication to which account and dashboard to send the data

Adafruit_MQTT_Publish touchsensor = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/touchsensor");

 

// Sensor and LED control unit

void setup()

{

i = 0;

Serial.begin(115200);

 

pinMode(2, OUTPUT);

digitalWrite (2, HIGH);   // Control the LED

delay(300);

digitalWrite(2, LOW);

 

delay(3000);

Serial.println("START");

WiFi.begin (" Valentina ", " xxxxxxxxxxxxxx ");      // Network name and password

while ((! ( WiFi.status () == WL_CONNECTED))) {   // loop here until we connect

delay(500);

Serial.print ("Connecting ...");

 

}    // Print to serial monitor just for info on what's going on

Serial.println ("Connected.");

Serial.println ("Your IP is:");

Serial.println((WiFi.localIP()));

Serial.println ("Sensor touch is checked");

}

 

void loop()

{

i = ( touchRead (T0));   // We assign the value read from the sensor to i

if (( touchRead (T0)) <20) { // We check that it is less than 20

if ( MQTT_connect ()) {      // Checking if Adafruit IO connection is OK

if ( touchsensor.publish (i)) {     // If e OK we send the value of i

Serial.print ("CONTACT WITH SENSOR IS REPORTED. CONTACT LEVEL:");

Serial.println(i);

digitalWrite(2, HIGH);

delay(1000);

digitalWrite(2, LOW);

} else {                 // Adafruit IO connection failed

Serial.println ("There is a problem with the sensor or the Adafruit driver");

}

}

} else {   // Value of i> 20 I only print to the serial monitor

Serial.print ("No contact. Reported contact level is:");

Serial.println(i);

}

delay (1000);   // Delay - 1 second

}

////////////////////////////////////////////////////

 

Result of serial monitor performance

When you touch the touch sensor, a message will appear about the   contact level counted from 0 to 100.