How to display temperature on Blynk. The display works for me.
#include <OneWire.h>
#include <Wire.h> // standardowa biblioteka Arduino
#include <LiquidCrystal_I2C.h> // dolaczenie pobranej biblioteki I2C dla LCD
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Ustawienie adresu ukladu na 0x27
int DS18S20_Pin = D4; //DS18S20 Signal pin on digital 2
OneWire ds(DS18S20_Pin); // on digital pin 2
char auth[] = "";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "TP-LINK_35031C";
char pass[] = "";
void setup()
{
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
lcd.begin(16,2); // Inicjalizacja LCD 2x16
lcd.backlight(); // zalaczenie podwietlenia
lcd.setCursor(0,0); // Ustawienie kursora w pozycji 0,0 (pierwszy wiersz, pierwsza kolumna)
lcd.print("Temperatura");
}
void loop(void) {
float temperature = getTemp();
Serial.println(temperature);
lcd.setCursor(0, 1);
lcd.print(temperature);
delay(1000); //just here to slow down the output so it is easier to read
}
float getTemp(){
//returns the temperature from one DS18S20 in DEG Celsius
byte data[12];
byte addr[8];
if ( !ds.search(addr)) {
//no more sensors on chain, reset search
ds.reset_search();
}
if ( OneWire::crc8( addr, 7) != addr[7]) {
Serial.println("CRC is not valid!");
}
if ( addr[0] != 0x10 && addr[0] != 0x28) {
Serial.print("Device is not recognized");
}
ds.reset();
ds.select(addr);
ds.write(0x44,1); // start conversion, with parasite power on at the end
byte present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
for (int i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
ds.reset_search();
byte MSB = data[1];
byte LSB = data[0];
float tempRead = ((MSB << 8) | LSB); //using two's compliment
float TemperatureSum = tempRead / 16;
return TemperatureSum;
Blynk.run();
}
