[blynk.io] Part 3 - Display sensor reading using Arduino

UnoBlynkIOAnalog.ino

/*
  [blynk.io] Part 3 - Display sensor reading using Arduino
  
  Board:
  - Maker UNO
    https://my.cytron.io/p-maker-uno-simplifying-arduino-for-education?tracking=idris
  - Arduino Grove Sensor Kit for Beginner
    https://my.cytron.io/p-arduino-grove-sensor-kit-for-beginner?tracking=idris
  - Cytron ESP8266 WiFi Shield
    https://my.cytron.io/p-cytron-esp8266-wifi-shield?tracking=idris

  Library:
  - Blynk V1.0.1
  
  Blynk Documentation:
  - https://docs.blynk.io/en/
  
  Last Modified: 7 Nov 2021
*/

/* 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 <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>

BlynkTimer timer;

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

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "YourNetworkName";
char pass[] = "YourPassword";

// or Software Serial on Uno, Nano...
#include <SoftwareSerial.h>
SoftwareSerial EspSerial(8, 9); // RX, TX

// Your ESP8266 baud rate:
#define ESP8266_BAUD 9600

#define LED   6
#define LIGHT A3

ESP8266 wifi(&EspSerial);

long prevMillis = 0;
int interval = 1000;

BLYNK_WRITE(V0)
{
  int pinValue = param.asInt();

  digitalWrite(LED, pinValue);
}

// This function sends Arduino's up time every second to Virtual Pin (1).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void myTimerEvent()
{
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  int light_adc = analogRead(LIGHT);
  Serial.println("Light ADC: " + String(light_adc));
  Blynk.virtualWrite(V1, light_adc);
}

void setup()
{
  pinMode(LIGHT, INPUT);
  pinMode(LED, OUTPUT);
  
  // Debug console
  Serial.begin(9600);

  delay(10);

  // Set ESP8266 baud rate
  EspSerial.begin(ESP8266_BAUD);
  delay(10);

  Blynk.begin(auth, wifi, ssid, pass);

  // Setup a function to be called every second
  timer.setInterval(1000L, myTimerEvent);
}

void loop()
{
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
}