Convert legacy blynk code to blynk iOT

[erickfloors]

I’m an old blynk legacy user but I don’t understand the current blynk iot format. how do I convert it?
I have code with header and footer format like this.my board code is Nodemcu with wifi manager

#include <FS.h>
#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
//needed for library
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager
 
#include <ArduinoJson.h>          //https://github.com/bblanchon/ArduinoJson
 
#include <SimpleTimer.h>
#include <DHT.h>
 
char blynk_token[34] = "BLYNK_TOKEN";
//flag for saving data
bool shouldSaveConfig = false;
 
//callback notifying us of the need to save config
void saveConfigCallback () {  
  Serial.println("Should save config");
  shouldSaveConfig = true;
}
bool pirEnabled = false;
BLYNK_WRITE(V1){
  int control4DigitalPins = param.asInt();
  if(control4DigitalPins == 1){
    digitalWrite(D1, HIGH);
    digitalWrite(D2, HIGH);
    digitalWrite(D3, HIGH);
    digitalWrite(D7, HIGH);
  }
  else{
    digitalWrite(D1, LOW);
    digitalWrite(D2, LOW);
    digitalWrite(D3, LOW);
    digitalWrite(D7, LOW);
  }
}
.....................
.......................
....................
.................
dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(10000L, sendWifi);
  timer.setInterval(1000L, sendSensor);
}
void sendWifi()
{
  Blynk.virtualWrite(V2, map(WiFi.RSSI(), -105, -40, 0, 100) );
}
void loop()
{
  Blynk.run(); // Initiates Blynk
  timer.run(); // Initiates SimpleTimer
}

and I also took a sample program from the new blynk iot like this

// Fill-in information from your Blynk Template here
//#define BLYNK_TEMPLATE_ID           "TMPLxxxxxx"
//#define BLYNK_DEVICE_NAME           "Device"

#define BLYNK_FIRMWARE_VERSION        "0.1.0"

#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG

#define APP_DEBUG

// Uncomment your board, or configure a custom board in Settings.h
//#define USE_SPARKFUN_BLYNK_BOARD
//#define USE_NODE_MCU_BOARD
//#define USE_WITTY_CLOUD_BOARD
//#define USE_WEMOS_D1_MINI

#include "BlynkEdgent.h"

void setup()
{
  Serial.begin(115200);
  delay(100);

  BlynkEdgent.begin();
}

void loop() {
  BlynkEdgent.run();
}

how do i convert it? thank you for helping because only now i want to switch to the new blynk iot

[John93]

There’s two options

One:
You can make some modifications to the blynk legacy sketch to make it work with the new blynk like adding BLYNK_TEMPLATE_ID and BLYNK_DEVICE_NAME at the top of your sketch, the first lines. For more details you can check the documentation
https://docs.blynk.io/en/blynk-1.0-and-2.0-comparison/migrate-from-1.0-to-2.0

Two:
You can use blynk edgent, which will give you the ability to use WiFi provisioning and OTA firmware update.

[PeteKnight]

Using the Edgent example (your second piece of code) would make your WiFi manager code redundant, so you’d need to delete that part of your existing sketch (or most likely just copy/paste the bits of your existing sketch that you wat to keep).

In the Edgent sketch you’d need to un-comment these lines of code:

@erickfloors

//#define BLYNK_TEMPLATE_ID           "TMPLxxxxxx"
//#define BLYNK_DEVICE_NAME           "Device"

and put the values that you obtain from the template screen in Blynk IoT in there.

You’d also need to un-comment this line of code:

@erickfloors

//#define USE_NODE_MCU_BOARD

so that the Settings.h tab of the sketch uses the appropriate LED and Blynk reset pins. These are used during the provisioning process (the part you did previously with WiFi Manager).
Unlike WiFiManager where you used a captive portal to enter the WiFi credentials (and possibly auth token), you do this via the new Blynk app, and an auth token is assigned dynamically as part of this process.

If you don’t want to use Edgent then it’s simply a case of creating a Template and Device in the web console then pasting the snippet of code that is then generated at the top of your existing sketch (and maybe tweaking the auth token variable name).

Pete.

[erickfloors]

So like this ?
im not understand with new blynk iot format…can anyone helpme?
im used wifi manager before on blynk legacy…
should i delete it because it is no longer needed?because i want the token to be replaceable like the old blynklegacy

#define BLYNK_TEMPLATE_ID "xxxxx"
#define BLYNK_DEVICE_NAME "RUMAH UNGARAN"
#define BLYNK_AUTH_TOKEN "xxxxxxxxxxxxxxxxxxxxxxxxx"
#include <FS.h>
#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
//needed for library
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager
 
#include <ArduinoJson.h>          //https://github.com/bblanchon/ArduinoJson
 
#include <SimpleTimer.h>
#include <DHT.h>
 
char blynk_token[34] = "BLYNK_TOKEN";
//flag for saving data
bool shouldSaveConfig = false;
 
//callback notifying us of the need to save config
void saveConfigCallback () {  
  Serial.println("Should save config");
  shouldSaveConfig = true;
}
bool pirEnabled = false;
BLYNK_WRITE(V1){
  int control4DigitalPins = param.asInt();
  if(control4DigitalPins == 1){
    digitalWrite(D1, HIGH);
    digitalWrite(D2, HIGH);
    digitalWrite(D3, HIGH);
    digitalWrite(D7, HIGH);
  }
  else{
    digitalWrite(D1, LOW);
    digitalWrite(D2, LOW);
    digitalWrite(D3, LOW);
    digitalWrite(D7, LOW);
  }
}
.....................
.......................
....................
.................
dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(10000L, sendWifi);
  timer.setInterval(1000L, sendSensor);
}
void sendWifi()
{
  Blynk.virtualWrite(V2, map(WiFi.RSSI(), -105, -40, 0, 100) );
}
void loop()
{
  Blynk.run(); // Initiates Blynk
  timer.run(); // Initiates SimpleTimer
}

and how to write footer format blynk run replace ?

Blynk.run(); // Initiates Blynk
  timer.run(); // Initiates SimpleTimer
}

replace to?

BlynkEdgent.run();
}

[John93]

You can check the documentation for more details
https://docs.blynk.io/en/getting-started/activating-devices/blynk-edgent-wifi-provisioning

[PeteKnight]

@erickfloors

i want the token to be replaceable like the old blynklegacy

Do you mean that you want the auth token to be entered via the WiFi Manager configurations screen?
If so, that wasn’t a Blynk Legacy feature, it was a WiFi Manager custom field feature, and there’s nothing to stop you doing the same thing with WiFi Manager and Blynk IoT.

@erickfloors

im not understand with new blynk iot format…can anyone helpme?

I’d suggest that you re-read what I wrote in post #3

Pete.

[erickfloors]

this is my code without using wifi manager. how do i change to new blynk iot version?
because in the code there is still a code
char auth[] = “xxxx”;
Thank you for help

#define BLYNK_TEMPLATE_ID "xxxxxx"
#define BLYNK_DEVICE_NAME "RUMAH UNGARAN"
#define BLYNK_AUTH_TOKEN "BTjAVwdSwUT2dsz_pTxxxxxxxxxx"
#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <DHT.h>
 
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "xxxx";
 
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "PULPSTONE";
char pass[] = "internet";
bool pirEnabled = false;
BLYNK_WRITE(V1){
  int control4DigitalPins = param.asInt();
  if(control4DigitalPins == 1){
    digitalWrite(D1, HIGH);
    digitalWrite(D2, HIGH);
    digitalWrite(D3, HIGH);
    digitalWrite(D7, HIGH);
  }
  else{
    digitalWrite(D1, LOW);
    digitalWrite(D2, LOW);
    digitalWrite(D3, LOW);
    digitalWrite(D7, LOW);
  }
}
}
 
BLYNK_WRITE(V3){  // button in switch mode
  if(param.asInt()){
    pirEnabled = true;  
  }
  else{
    pirEnabled = false;    
  }
}
 
#define DHTPIN 2          // What digital pin we're connected to
#define ledPower 16
 
// Uncomment whatever type you're using!
#define DHTTYPE DHT11     // DHT 11
//#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21   // DHT 21, AM2301
 
DHT dht(DHTPIN, DHTTYPE);
SimpleTimer timer;
 
// This function sends Arduino's up time every second to Virtual Pin (5).
// 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 sendSensor()
{
  int h = dht.readHumidity();
  int t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
 
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  int p=digitalRead(14);
 
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5, h);
  Blynk.virtualWrite(V6, t);
 if((p==HIGH) && (pirEnabled == true)){
 Blynk.notify("Gerakan terdeteksi");
}
}
void setup()
{
  pinMode (ledPower,OUTPUT);
  digitalWrite (ledPower, HIGH);
  pinMode(14,INPUT);
  Serial.begin(9600); // See the connection status in Serial Monitor
  Blynk.begin(auth, ssid, pass);
 
  dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(10000L, sendWifi);
  timer.setInterval(1000L, sendSensor);
}
void sendWifi()
{
  Blynk.virtualWrite(V2, map(WiFi.RSSI(), -105, -40, 0, 100) );
}
 
void loop()
{
  Blynk.run(); // Initiates Blynk
  timer.run(); // Initiates SimpleTimer
}

[PeteKnight]

@erickfloors

this is my code without using wifi manager. how do i change to new blynk iot version?
because in the code there is still a code
char auth = “xxxx”;

Start by opening the Blynk Edgent ESP8266 example from the Arduino IDE.
Add your Template ID and Device name, and un-comment the NodeMCU board type in the sketch.
You’ve created a device based on that sketch - delete that device in the web console.

@erickfloors

#define DHTPIN 2 // What digital pin we're connected to

Read this, especially the section about defining your switch and physical LED. You’ll then understand why this line of your code will be an issue…

Troubleshooting Edgent Dynamic Provisioning Problems

There seems to quite a bit of confusion about how the dynamic provisioning process works in the Edgent sketch examples, and how to re-provision a device with new WiFi credentials. Many people omit to configure the board type correctly in the sketch, and this also causes problems. Here’s a guide to how the process works, and the things to watch out for… Overview You start by creating a template, preferably in the web console (https://blynk.cloud/) This gives you the BLYNK_TEMPLATE_ID and BLYNK…

Copy the relevant lines of code from your sketch into the Edgent example. DO NOT copy these lines over…

@erickfloors

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

Replace this line:

@erickfloors

SimpleTimer timer;

With:
BlynkTimer timer;

You do not need…

@erickfloors

Blynk.run(); // Initiates Blynk

in your void loop, the BlynkEdgent.run line that’s already there does the same thing.

I’d also suggest that you switch from referencing your I/O pins using a mixture of GPIO and “D” numbers, and stick with GPIO numbers throughout and add a comment which tells you which D number this is to simplify wiring.

I’d also stop trying to read your DHT sensor every 1 second and move to 5 second intervals. If you need 1 second temperature/humidity endings then switch to a faster sensor. The DCT sensors extremely slow and inaccurate and aren’t worth using for most applications, but if you do use them it’s best to read them no more than once every 5 seconds.

When you’ve uploaded the sketch you provision the board with WiFi credentials and a dynamically assigned Auth token with the “+ New Device” option in the app.

Pete.

[erickfloors]

So like this?

#define BLYNK_TEMPLATE_ID "TMPLYTcvzJ-K"
#define BLYNK_DEVICE_NAME "RUMAH UNGARAN"
#define BLYNK_FIRMWARE_VERSION        "0.1.0"

#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG

#define APP_DEBUG

// Uncomment your board, or configure a custom board in Settings.h
//#define USE_SPARKFUN_BLYNK_BOARD
#define USE_NODE_MCU_BOARD
//#define USE_WITTY_CLOUD_BOARD
//#define USE_WEMOS_D1_MINI

#include "BlynkEdgent.h"
#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <SPI.h>
#include <DHT.h>
 
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
//char auth[] = "xxxx";
 
// Your WiFi credentials.
// Set password to "" for open networks.
//char ssid[] = "PULPSTONE";
//char pass[] = "internet";
bool pirEnabled = false;
BLYNK_WRITE(V1){
  int control4DigitalPins = param.asInt();
  if(control4DigitalPins == 1){
    digitalWrite(GPIO5, HIGH);
    digitalWrite(GPIO4, HIGH);
    digitalWrite(GPIO0, HIGH);
    digitalWrite(GPIO13, HIGH);
  }
  else{
    digitalWrite(GPIO5, LOW);
    digitalWrite(GPIO4, LOW);
    digitalWrite(GPIO0, LOW);
    digitalWrite(GPIO13, LOW);
  }
}
}
 
BLYNK_WRITE(V3){  // button in switch mode
  if(param.asInt()){
    pirEnabled = true;  
  }
  else{
    pirEnabled = false;    
  }
}
 
#define DHTPIN 2          // What digital pin we're connected to
#define ledPower 16
 
// Uncomment whatever type you're using!
#define DHTTYPE DHT11     // DHT 11
//#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21   // DHT 21, AM2301
 
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;
 
// This function sends Arduino's up time every second to Virtual Pin (5).
// 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 sendSensor()
{
  int h = dht.readHumidity();
  int t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
 
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  int p=digitalRead(14);
 
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5, h);
  Blynk.virtualWrite(V6, t);
 if((p==HIGH) && (pirEnabled == true)){
 Blynk.notify("Gerakan terdeteksi");
}
}
void setup()
{
  pinMode (ledPower,OUTPUT);
  digitalWrite (ledPower, HIGH);
  pinMode(14,INPUT);
  Serial.begin(9600); // See the connection status in Serial Monitor
  Serial.begin(115200);
  delay(100);

  BlynkEdgent.begin();
}
dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(50000L, sendWifi);
  timer.setInterval(5000L, sendSensor);
}
void sendWifi()
{
  Blynk.virtualWrite(V2, map(WiFi.RSSI(), -105, -40, 0, 100) );
}
 
void loop() {
  BlynkEdgent.run();
}

please for guide…

[John93]

@erickfloors

digitalWrite(GPIO0, HIGH);

@erickfloors

digitalWrite(GPIO0, LOW);

@erickfloors

#define DHTPIN 2

If you go to the Settings.h file, you will notice that pins 0 and 2 are already in use, so using them for a different purpose may cause a conflict. I’d suggest that you check the Settings.h file and choose your pins wisily.

@erickfloors

Blynk.notify("Gerakan terdeteksi");

Blynk.notify has been replaced with Blynk.logEvent. read the documentation for more details

Events

@erickfloors

Serial.begin(9600); // See the connection status in Serial Monitor
  Serial.begin(115200);

Only one Serial.begin is required.

@erickfloors

void loop() {
  BlynkEdgent.run();
}

You should add timer.run();

[PeteKnight]

@erickfloors

#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG

@erickfloors

#define BLYNK_PRINT Serial // Comment this out to disable prints and save space

Duplicated lines of code!

@erickfloors

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
//char auth[] = "xxxx";
 
// Your WiFi credentials.
// Set password to "" for open networks.
//char ssid[] = "PULPSTONE";
//char pass[] = "internet";

Delete this, it’s misleading.

@erickfloors

    digitalWrite(GPIO5, HIGH);
    digitalWrite(GPIO4, HIGH);
    digitalWrite(GPIO0, HIGH);
    digitalWrite(GPIO13, HIGH);

You need to remove “GPIO” and simply have the pin numbers…

    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(0, HIGH);
    digitalWrite(13, HIGH);

But a better wat woiuld be like this:
Near the top of your code, after the #include "BlynkEdgent.h" line of code, define aliases for your pins, like you have here, where you give pin 16 the alias “ledPower”…

@erickfloors

digitalWrite (ledPower, HIGH);

then use this alias when you reference the pin in your code, like you do here…

@erickfloors

#define ledPower 16

This makes the code easier to understand and debug, but also makes it easier to change which pins you are using because you only need to make one change at the top of your code rather than doing search and replace operations on the sketch.

@erickfloors

  Serial.begin(9600); // See the connection status in Serial Monitor
  Serial.begin(115200);

More duplication, you only ned one of these. If you’re using a NodeMCU then a baud rate of 74880 is usually best, as this is usually the native baud rate of the board and it allows you to view both the boot messages from the board and the serial debug messages without changing baud rates in your serial monitor.
For an ESP32 a baud rate of 115200 is best.

@erickfloors

Blynk.notify("Gerakan terdeteksi");

As @John93 mentioned, this now needs to be changed so that it logs an event that has a notification attached to it. There is a limit of how many times each event type and notification can be triggered each day (100 times in a 24 hour period), and your code would lof an event each time sendSensor is called and this ‘if’ statement is true…

@erickfloors

if((p==HIGH) && (pirEnabled == true)){
 Blynk.notify("Gerakan terdeteksi");
}

This could lead yo you quickly running out of events/notifications for the day. The way around this is to use a “flag” variable as described here…

Events, Notifications and the use of "Flag" variables

Update 19th May 2022 - you’ll see references to a limit of one event per minute in this tutorial. It appears that this limit has now been removed. I’ve not yet tested this myself, and when I do I’ll update the tutorial to reflect my findings. I’m seeing quite a few posts from people who are finding it difficult to get notifications working in Blynk IoT, and who don’t understand how to use “flag” variables to limit the number of notifications that are sent for any given alert situation. I thoug…

But, your sendWifi and sendSensor functions aren’t being called at the moment, because you missed-out these lines in your void setup:

  timer.setInterval(10000L, sendWifi);
  timer.setInterval(1000L, sendSensor); <<< Change to at least 5000L

Pete.

[erickfloors]

Thanks Mr Pete & Mr John93…I made this revision…is it correct?

#define BLYNK_TEMPLATE_ID "XXXXXXXXX"
#define BLYNK_DEVICE_NAME "RUMAH UNGARAN"
#define BLYNK_FIRMWARE_VERSION        "0.1.0"

#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG

#define APP_DEBUG

// Uncomment your board, or configure a custom board in Settings.h
//#define USE_SPARKFUN_BLYNK_BOARD
#define USE_NODE_MCU_BOARD
//#define USE_WITTY_CLOUD_BOARD
//#define USE_WEMOS_D1_MINI

#include "BlynkEdgent.h"
#define ledPower 16
#include <SPI.h>
#include <DHT.h>
 

bool pirEnabled = false;
BLYNK_WRITE(V1){
  int control4DigitalPins = param.asInt();
  if(control4DigitalPins == 1){
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(0, HIGH);
    digitalWrite(13, HIGH);
  }
  else{
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    digitalWrite(0, LOW);
    digitalWrite(13, LOW);
  }
}
}
 
BLYNK_WRITE(V3){  // button in switch mode
  if(param.asInt()){
    pirEnabled = true;  
  }
  else{
    pirEnabled = false;    
  }
}
 
#define DHTPIN 2          // What digital pin we're connected to
#define ledPower 16
 
// Uncomment whatever type you're using!
#define DHTTYPE DHT11     // DHT 11
//#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21   // DHT 21, AM2301
 
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;
 
// This function sends Arduino's up time every second to Virtual Pin (5).
// 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 sendSensor()
{
  int h = dht.readHumidity();
  int t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
 
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  int p=digitalRead(14);
 
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5, h);
  Blynk.virtualWrite(V6, t);
 if((p==HIGH) && (pirEnabled == true)){
 Blynk.logEvent("Gerakan terdeteksi");
}
}
void setup()
{
  pinMode (ledPower,OUTPUT);
  
  pinMode(14,INPUT);
  Serial.begin(74880); // See the connection status in Serial Monitor
  
  delay(100);

  BlynkEdgent.begin();
}
dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(50000L, sendWifi);
  timer.setInterval(5000L, sendSensor);
}
void sendWifi()
{
  Blynk.virtualWrite(V2, map(WiFi.RSSI(), -105, -40, 0, 100) );
}
 
void loop() {
  BlynkEdgent.run();
}
timer.run();

Thank you for your attention

[John93]

@erickfloors

void loop() {
  BlynkEdgent.run();
}
timer.run();

timer.run should be in the void loop.

void loop() {
  BlynkEdgent.run();
  timer.run();
}

[PeteKnight]

More duplicates…

@erickfloors

#define ledPower 16

@erickfloors

#define ledPower 16

@erickfloors

This is your void setup...

void setup()
{
  pinMode (ledPower,OUTPUT);
  
  pinMode(14,INPUT);
  Serial.begin(74880); // See the connection status in Serial Monitor
  
  delay(100);

  BlynkEdgent.begin();
}

and this code, which should be inside your void setup, is stranded in No Man’s Land and has a stray closing curly bracket at the end…

@erickfloors

dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(50000L, sendWifi);
  timer.setInterval(5000L, sendSensor);
}

You’ve also ignored my advice about adding a flag variable to prevent your Blynk.logEvent code from exceeding the notifications limit.

Pete.