C++ Blynk (Legacy) - Code Examples for Basic Tasks

Projects made with Blynk
31

#17 - Dual Temperature Sensors running on ESP-01

This is a simple example of running both a DHTxx (in this case DHT11) and DS18B20 1-wire sensors on the lowly ESP-01

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#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

#include <ESP8266mDNS.h>  // For OTA
#include <WiFiUdp.h>  // For OTA
#include <ArduinoOTA.h>  // For OTA

char auth[] = "xxxxxxxxxx";  // Local Server
char ssid[] = "xxxxxxxxxx";
char pass[] = "xxxxxxxxxx";
//char server[] = "xxx.xxx.xxx.xxx";  // IP for your Local Server
char server[] = "blynk-cloud.com";
int port = 8080;

BlynkTimer timer;

// DHT22 Sensor setup
#include <DHT.h>
#define DHTPIN 0  // GPIO0 - pin5 on ESP-01
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
float h;
float t;

// DS18B20 Sensor setup
#include <OneWire.h>
#include<DallasTemperature.h>
#define ONE_WIRE_BUS 2  // GPIO2 - pin3 on ESP-01
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
float DS18B20Temp;




void setup()
{
  DS18B20.begin();

  Blynk.connectWiFi(ssid, pass);
  Blynk.config(auth, server, 8080);
  Blynk.connect();

  timer.setInterval(1000L, UpTime);
  timer.setInterval(60000L, DS18B20TempSensor);
  timer.setInterval(10050L, DHTTempHumSensor);

  Blynk.virtualWrite(2, BLYNK_VERSION);
  Blynk.virtualWrite(6, ESP.getCoreVersion());

  ArduinoOTA.setHostname("ESP-01 Multi-temp");  // For OTA
  ArduinoOTA.begin();  // For OTA
}



void DS18B20TempSensor()  // DS18B20 sensor reading
{
  DS18B20.requestTemperatures();
  delay(500);  // Yes, the evil delay... but only for a really short time every 10s .  Alternative options are avail with timers.
  Blynk.virtualWrite(V3, DS18B20.getTempCByIndex(0));
}



void DHTTempHumSensor()  // DHT sensor reading
{
  h = dht.readHumidity();
  t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
  Blynk.virtualWrite(V4, h);
  Blynk.virtualWrite(V5, t);
}



BLYNK_WRITE(V1) {  // Quick test read.  Clears all values and reloads
  if (param.asInt()) {
    Blynk.virtualWrite(V0, 0);
    Blynk.virtualWrite(V3, 0);
    Blynk.virtualWrite(V4, 0);
    Blynk.virtualWrite(V5, 0);
    DS18B20TempSensor();
    DHTTempHumSensor();
  }
}



void UpTime()
{
  Blynk.virtualWrite(V0, millis() / 1000);
  Blynk.virtualWrite(V7, WiFi.RSSI());
}



void loop()
{
  Blynk.run();
  timer.run();
  ArduinoOTA.handle();  // For OTA
}
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