ESP -> Telefon

Kui on kange tahmine imeda ESP-st infi aga wifi ruuterit pole ligidal.  Lahenduseks on telefon seadustada Acess Point-na (APN, vastavalt oma võrgu nimi/psw). Andmeside lülita sisse.
ESP -seadista audentima telefoni võrku ja toide nt akupangast ning andmed kupata Blynki. Telef.-s installi Blynk app lugemisels.
Allolevas näites on Wemos D1 külge poogitud CO2 sensor (MH-Z19B) tulemi lugemiseks Blynk terminal widget (virtual pin V51).

// Blynk(V51) <-> APN <- Wemos Mini D1 <- MH-Z19B

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// Blynk
char auth[] = "sdfsdfsdfsdfsdfsdfsd";
char ssid[] = "TelefonAP";
char pass[] = "fpassword";

uint32_t tim;
int x=0;

#include <SoftwareSerial.h>
SoftwareSerial co2Serial(12, 13); // define MH-Z19 RX TX

void setup() {
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  co2Serial.begin(9600);
  delay(3*60*1000); // sensor preheating
  //Serial.println("Start");
}

int readCO2UART() {
  int ppm_uart = 0;
  char cmd[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};
  char response[9]; // for answer

  //Serial.println("Sending CO2 request...");
  co2Serial.write(cmd, 9); //request PPM CO2

  // clear the buffer
  memset(response, 0, 9);
  int i = 0;
  while (co2Serial.available() == 0) {
    delay(1000);
    i++;
  }
  if (co2Serial.available() > 0) {
    co2Serial.readBytes(response, 9);
  }
  // print out the response in hexa
  for (int i = 0; i < 9; i++) {
  }
  // checksum
  char check = getCheckSum(response);
  if (response[8] != check) {
    Serial.println("Checksum error");
  } else {
    byte status = response[5];
    if (status != 0) {
    } else {
      // ppm
      ppm_uart = 256 * (int)response[2] + response[3];
      //Serial.print("CO2: ");
      //Serial.println(ppm_uart);
      return ppm_uart;
    }
  }
}

byte getCheckSum(char *packet) {
  byte i;
  unsigned char checksum = 0;
  for (i = 1; i < 8; i++) {
    checksum += packet[i];
  }
  checksum = 0xff - checksum;
  checksum += 1;
  return checksum;
}
void Bly(){
  if ((millis() > tim) ) {
    tim = millis() + 10000;
    int ppm = readCO2UART();
    String z = "(" + String(x) + ") - " + String(ppm); 
    Blynk.virtualWrite(V51, z);
    x++;
  }
}

void loop() {
  Blynk.run();
  Bly();
  
}​