OPENESCUELA

  In this training, you will learn the basics of the Internet of Things. In this part, you will learn how to visualize on an IoT platform (Blynk) the data acquired from a TMP36 temperature sensor.

Temperature data acquisition program from the TMP36 using the ESP32 card:

int sensorPin = 34;
float pinVal = 0;
float voltVal = 0;
float tempVal = 0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  pinVal = analogRead(sensorPin);
  voltVal = pinVal / 1024;
  tempVal = (voltVal - 0.5) * 100;
  Serial.print(tempVal); Serial.println("°C");
  delay(500);
}

Program to send temperature data to the dashboard:

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

/* Fill-in your Template ID (only if using Blynk.Cloud) */
//#define BLYNK_TEMPLATE_ID   "YourTemplateID"


#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "743wLRFWj7tZz5o1VPyaoDmg42HQFx2c";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "opsa";
char pass[] = "op+sa=opsa";

int sensorPin = 34;
float pinVal = 0;
float voltVal = 0;
float tempVal = 0;
BlynkTimer timer;

void sendTemp()
{
  pinVal = analogRead(sensorPin);
  voltVal = pinVal / 1024;
  tempVal = (voltVal - 0.5) * 100;
  Serial.print(tempVal); Serial.println("°C");
  Blynk.virtualWrite(V3, tempVal);
}

void setup()
{
  // Debug console
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(1000L, sendTemp);
}

void loop()
{
  Blynk.run();
  timer.run();
}