You are using interrupt not correctly. ISR (Interrupt Service Routine) must be lean and mean, without using time-consuming functions such as Blynk.email(), Blynk.virtualWrite(), etc…
Please do some research about writing ISRs before using it to avoid unnecessary headache.
Anyway, try this example in BlynkEthernet_WM library, just written based on your posted sketch
The fixed code
/****************************************************************************************************************************
* W5100_Blynk_Email.ino
* For Mega/UNO/Nano boards
*
* BlynkEthernet_WM is a library for Mega/UNO/Nano AVR boards, with Ethernet W5X00 board,
* to enable easy configuration/reconfiguration and autoconnect/autoreconnect of Ethernet/Blynk
*
* Library forked from Blynk library v0.6.1 https://github.com/blynkkk/blynk-library/releases
* Built by Khoi Hoang https://github.com/khoih-prog/Blynk_WM
* Licensed under MIT license
* Version: 1.0.4
*
* Original Blynk Library author:
* @file BlynkSimpleEsp8266.h
* @author Volodymyr Shymanskyy
* @license This project is released under the MIT License (MIT)
* @copyright Copyright (c) 2015 Volodymyr Shymanskyy
* @date Jan 2015
* @brief
*
* Version Modified By Date Comments
* ------- ----------- ---------- -----------
* 1.0.4 K Hoang 12/01/2020 First release v1.0.4 in synch with Blynk_WM library v1.0.4
*****************************************************************************************************************************/
#if defined(ESP8266) || defined(ESP32)
#error This code is designed to run on Arduino AVR (Nano, UNO, Mega, etc.) platform, not ESP8266 nor ESP32! Please check your Tools->Board setting.
#endif
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetWebServer.h>
// Start location in EEPROM to store config data. Default 0
// Config data Size currently is 128 bytes)
#define EEPROM_START 256
#define USE_SSL false
#if USE_SSL
// Need ArduinoECCX08 and ArduinoBearSSL libraries
// Currently, error not enough memory for UNO, Mega2560. Don't use
#include <BlynkSimpleEthernetSSL_WM.h>
#else
#include <BlynkSimpleEthernet_WM.h>
#endif
#define USE_BLYNK_WM true
#if !USE_BLYNK_WM
#define USE_LOCAL_SERVER true
#if USE_LOCAL_SERVER
char auth[] = "******";
char server[] = "your_account.duckdns.org";
//char server[] = "192.168.2.112";
#else
char auth[] = "******";
char server[] = "blynk-cloud.com";
#endif
#define BLYNK_HARDWARE_PORT 8080
#endif
BlynkTimer timer;
#define W5100_CS 10
#define SDCARD_CS 4
#define BUTTON_PIN 2
volatile unsigned int count = 0;
volatile bool isButtonPressed = false;
void emailOnButtonPress()
{
if ( !isButtonPressed && !digitalRead(BUTTON_PIN)) // You can write any condition to trigger e-mail sending
{
isButtonPressed = true;
count++;
Serial.println("Button pressed");
}
}
void processButton(void)
{
// *** WARNING: You are limited to send ONLY ONE E-MAIL PER 5 SECONDS! ***
// Let's send an e-mail when you press the button
// connected to digital pin BUTTON_PIN (2) on your Arduino
static String body;
if (isButtonPressed) // You can write any condition to trigger e-mail sending
{
body = String("You pushed the button ") + count + " times.";
// This can be seen in the Serial Monitor
Serial.println(body);
Blynk.email("your_email@gmail.com", "Subject: Button Logger", body);
isButtonPressed = false;
}
}
void setup()
{
// Debug console
Serial.begin(115200);
Serial.println(F("\nStart W5100_Blynk_Email"));
pinMode(BUTTON_PIN, INPUT_PULLUP);
pinMode(SDCARD_CS, OUTPUT);
digitalWrite(SDCARD_CS, HIGH); // Deselect the SD card
#if USE_BLYNK_WM
Blynk.begin();
#else
#if USE_LOCAL_SERVER
Blynk.begin(auth, server, BLYNK_HARDWARE_PORT);
#else
Blynk.begin(auth);
// You can also specify server:
//Blynk.begin(auth, server, BLYNK_HARDWARE_PORT);
#endif
#endif
if (Blynk.connected())
{
Serial.print(F("Conn2Blynk: server = "));
Serial.print(Blynk.getServerName());
Serial.print(F(", port = "));
Serial.println(Blynk.getHWPort());
Serial.print(F("Token = "));
Serial.print(Blynk.getToken());
Serial.print(F(", IP = "));
Serial.println(Ethernet.localIP());
}
// Attach pin BUTTON_PIN (2) interrupt to our handler
attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), emailOnButtonPress, FALLING /*CHANGE*/);
timer.setInterval(30000L, processButton);
}
void heartBeatPrint(void)
{
static int num = 1;
if (Blynk.connected())
Serial.print(F("B"));
else
Serial.print(F("F"));
if (num == 80)
{
Serial.println();
num = 1;
}
else if (num++ % 10 == 0)
{
Serial.print(F(" "));
}
}
void check_status()
{
static unsigned long checkstatus_timeout = 0;
#define STATUS_CHECK_INTERVAL 60000L
// Send status report every STATUS_REPORT_INTERVAL (60) seconds: we don't need to send updates frequently if there is no status change.
if ((millis() > checkstatus_timeout) || (checkstatus_timeout == 0))
{
heartBeatPrint();
checkstatus_timeout = millis() + STATUS_CHECK_INTERVAL;
}
}
void loop()
{
Blynk.run();
timer.run();
check_status();
}
Hereafter is the terminal output showing it’s working OK
Start W5100_Blynk_Email
[0] EEPROM, sz:4096
[0] Hdr=W5X00,Auth=****
[3] Svr=your_account.duckdns.org,Port=8080
[6] SIP=192.168.2.79,BName=W5100_Blynk
[9] MAC: FE-F6-B5-F8-EC-EC
Ethernet begin: IP = 192.168.2.79, dns = 192.168.2.1, gateway = 192.168.2.1, subnet = 255.255.255.0
[1574] GetIP:
[1575] IP:192.168.2.79
[1575]
___ __ __
/ _ )/ /_ _____ / /__
/ _ / / // / _ \/ '_/
/____/_/\_, /_//_/_/\_\
/___/ v0.6.1 on Arduino Mega
[1586] bg: E.con.Try B
[1903] Ready (ping: 5ms).
[1971] bg: EBconn'd
Conn2Blynk: server = your_account.duckdns.org, port = 8080
Token = ****, IP = 192.168.2.79
B
Button pressed
You pushed the button 1 times.
B
Button pressed
You pushed the button 2 times.
BBBBBBBB BBB
Code should be formatted as example below.
