- Hardwaregrowler 2 1 – Notification For Hardware Status Changes 2020
- Hardwaregrowler 2 1 – Notification For Hardware Status Changes Date
- Hardwaregrowler 2 1 – Notification For Hardware Status Changes Status
- Hardwaregrowler 2 1 – Notification For Hardware Status Changes Notification
- Hardwaregrowler 2 1 – Notification For Hardware Status Changes Status
In this quick tutorial we are going to learn how to send emails and push notifications from the WiFi ESP8266 module, or any other IoT device, using Blynk Email and Push Notification APIs. For this demonstration we are going to build a simple thermometer project and then setup temperature Alarm points. Whenever the alarms will trigger, an email and a push notification will be sent.
Project difficulty
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This project requires low to medium programming knowledge and medium electronics knowledge. To complete this project you will spend minimum 20 minutes.
Required materials and hardware
Hardwaregrowler 2 1 – Notification For Hardware Status Changes 2020
- 1 x WiFi Module ESP8266 ESP01 – see price $$
- 1 x DHT22 Temperature and humidity sensor – see price $$
- 1 x Prototyping Breadboard – see price $$
- 1 x Breadboard Power supply – see price $$
IoT Blynk Email and Push Notifications – Arduino example using ESP8266
At this time, from what I found, the simplest method to send Emails from a ESP8266 WiFi module is by using IoT Blynk platform. By calling Blynk APIs in Arduino code, we can achieve this very simple and fast. If this is your first time when hearing about ESP8266 modules you should first checkout this ESP8266 tutorial. Also if you are into IoT but you never used Blynk read here a complete Blynk tutorial with video examples.
Project setup – step by step
- Setup your hardware project following the hookup sketch below (skip this, if you already have a working IoT test environment)
- Download and install the Blynk app on your smartphone – Android, IOS
- Setup a new Blynk Project on your smartphone – see here how create a Blynk project
- Add Email and Notification Widgets on your Blynk project (see images below)
- Get the Authorization Token from the Blynk Project
- Open Arduino IDE and paste my DHT22 Thermometer sketch example
- Upload the sketch into your ESP8266 Module
In the image below you can see Blynk Email and Push Notification Widgets in the widget box, and also dragged on the dashboard. Macdive 2 3 1. The Email Widgets gives you the possibility to overwrite the email address from the application.
The Arduino code is pretty simple. The Arduino example below is made for a prototype using ESP8266 version 01 and DHT22 Temperature and Humidity sensor. The DHT22 is hooked on the GPIO02 and defined as DHTPIN 2. The readings are made in a loop interval of 2,5 seconds, as the DHT22 requires at least 2 seconds to refresh the measurements. Have a look over this code and after that we will continue the explaining:
Nothing so new, nothing so hard. As I promise you, to achieve our goal we just need to add only two new lines:
As you can see in the example above, first line stands for calling the Blynk Email API. Execution is done with 3 parameters: email address, subject and body, pretty much familiar as in many programming languages.
Blynk Email limitation and downsides
Maximum allowed length is 120 symbols for all email + subject + message. However you can increase this limit if necessary by adding following commands to you sketch:
Where XXX is desired max length of your email. For example for ESP you can set this to 1200 max length #define BLYNK_MAX_SENDBYTES 1200. Note that this line must be on top of any of the Blynk includes in your sketch.
The time limit between sending emails is minimum 15 seconds. In case you are using gmail you are limited with 500 mails per day (by google). Other providers may have similar limitations, so please be careful. The Blynk free cloud server gives you a maximum of 100 emails every day.
The second line obviously calls the Notification API which triggers Mobile OS specific notifications. The Blynk Push notification API offers two additional options as follows:
- Notify when hardware offline – you will get push notification in case your hardware went offline.
- Priority high priority gives more chances that your message will be delivered without any delays.
Blynk Push Notifications limitation and downsides
- The notification body maximum length can have 120 symbols
- Time limit between notifications is at least 15 seconds
I think that, for most of you, the above limitations will not affect the project flow. Therefore, this is a great way to achieve emails and push notifications, having no costs whatsoever. Even at some point we need to pay a bit to extend the Blynk potential, considering the benefits I really have no problem paying.
If you want to find more about which are the best temperature sensors in Internet of Things projects, read this awesome comparison between DHT22 and DS18B20 sensors.
Hoping that this article inspired you, i kindly invite you sharethis article, subscribe my YouTube channel and join the communities on social networks. Please feel free to comment or send suggestions / remarks so i can improve the content quality!
Share on: FacebookTwitterGoogle+28 Replies to “Blynk Email and Push Notifications tutorial – ESP8266 Arduino Example”
Maria Nurlela Dabukkesays:Hi,
May I know how much is voltage of the breadboard power supply?
Lucian Vaduvasays:May I know how much is voltage of the breadboard power supply?
Hello, the breadboard power supply provides both 5v and 3v3. For ESP you should use 3v3.
Maria Nurlela Dabukkesays:Hi,
Where is I can found the complete circuit diagram?
Where is I can found the complete circuit diagram?
Thanks
ayusays:hello. i would like ask a question.
i am working my final project which is pet feeder that is controlled by mobile phone apps, which is blynk. and i need the apps to send push notifications to remind the user to feed the pet. example is “feed me!”. and i need the push notification to send at least twice a day. i am very new to c programming and really in need of help. if you could help me feel free to contact me through my email [email protected] / [email protected]. thnkyou so much. may god bless you.
Fariedsays:Hi! I’m using arduino Uno and esp 8266 wifi module for my project. in Arduino IDE/tools you choose what board? Arduino Uno or Esp8266? Please help me
Lucian Vaduvasays:Hi there! Depends on which method you use to upload code into your ESP8266. I have detailed all methods in this article:
https://www.geekstips.com/esp8266-arduino-tutorial-iot-code-example/
zainalsays:https://www.geekstips.com/esp8266-arduino-tutorial-iot-code-example/
hi Vaduva,
I’ve tried to sketch from you, but when compiling comes the message “C: Users tya Documents esp8266 sketch_nov08b_notif_suhu_blynk sketch_nov08b_notif_suhu_blynk.ino sketch_nov08b_notif_suhu_blynk.ino.ino: 8:25: fatal error: SimpleTimer.h: No file or directory
I’ve tried to sketch from you, but when compiling comes the message “C: Users tya Documents esp8266 sketch_nov08b_notif_suhu_blynk sketch_nov08b_notif_suhu_blynk.ino sketch_nov08b_notif_suhu_blynk.ino.ino: 8:25: fatal error: SimpleTimer.h: No file or directory
#include
^
compilation terminated. ”
Thank you for the help
Lucian Vaduvasays:Thank you for the help
Make sure that you have installed latest Blynk library. Go to library manager, seach for blynk and install or update it. From what I remember on the fly, I think SimpleTimer.h is included in Blynk.
Sadirbeksays:I am using ET215 moisture sensor. How can I define my sensor on the code? Is there necessary download library for my sensor?
Thanks in advance
Radu C. Asandeisays:Thanks in advance
Hi Lucian!
I’ve tried to compile your sketch from above, but it seems that you have used a different DHT library from what I have installed. Please, can you tell me from where I can get/download what you had used?
Thanks in advance.
Volkersays:I’ve tried to compile your sketch from above, but it seems that you have used a different DHT library from what I have installed. Please, can you tell me from where I can get/download what you had used?
Thanks in advance.
if(t > 28){
Blynk.email(“[email protected]”, “ESP8266 Alert”, “Temperature over 28C!”);
Blynk.notify(“ESP8266 Alert – Temperature over 28C!”);
}
Blynk.email(“[email protected]”, “ESP8266 Alert”, “Temperature over 28C!”);
Blynk.notify(“ESP8266 Alert – Temperature over 28C!”);
}
Will you get repeated Mails/Notifies, if the temperature remains obove 28?
Lucian VaduvaHardwaregrowler 2 1 – Notification For Hardware Status Changes Date
says:You are right, but this is just for the sake of example. Adjusting your conditions should be straight forward from here
Harieshsays:Can i do this using usb mode in blynk. That is without using ESP8266
and using arduino uno
Mishahsays:and using arduino uno
Hardwaregrowler 2 1 – Notification For Hardware Status Changes Status
Affascinante esercizio, il primo che ho realizzato usando il mio nuovo DHT22 che funziona alla grande. Tuttavia in principio sono impazzito perché c’è un pò di confusione nello schema elettrico, infatti manca il secondo collegamento di alimentazione alla piccola scheda esp 01, e di conseguenza non mi si accendeva. Poi però mi sono accorto di questo particolare ed ha funzionato tutto alla perfezione. complimenti all’autore.
Abhilasha Jainsays:Hi ,
From where can we get the complete circuit diagram? including arduino,esp and DHT sensor.
Kindly provide the complete circuit diagram.
From where can we get the complete circuit diagram? including arduino,esp and DHT sensor.
Kindly provide the complete circuit diagram.
Thank you.
Cetsays:Hi, I did your project, works well. Then I changed the sensor with DS18B20 but I can not get the email alert and any notification. What is wrong with this code? any help would be appreciated
/* ESP & Blynk */
#include
#include
#define BLYNK_PRINT Serial
#include
#include
#define BLYNK_PRINT Serial
/* Blynk credentials */
char auth[] = “hgffffffffffffffffffff”;
char auth[] = “hgffffffffffffffffffff”;
/* TIMER */
#include
SimpleTimer timer;
#include
SimpleTimer timer;
/* DS18B20 Temperature Sensor */
#include
#include
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
int temp_0;
#include
#include
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
int temp_0;
void setup()
{
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
DS18B20.begin();
timer.setInterval(1000L, getSendData);
Serial.println(” “);
Serial.println(“tst”);
{
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
DS18B20.begin();
timer.setInterval(1000L, getSendData);
Serial.println(” “);
Serial.println(“tst”);
if(temp_0 > 26){
Blynk.email(“[email protected]”, ” Alert”, “Temp 26C!”);
Blynk.notify(” Alert – Temp 26C!”);
}
}
Blynk.email(“[email protected]”, ” Alert”, “Temp 26C!”);
Blynk.notify(” Alert – Temp 26C!”);
}
}
void loop()
{
timer.run();
Blynk.run();
}
{
timer.run();
Blynk.run();
}
/***************************************************
* Send Sensor data to Blynk
**************************************************/
void getSendData()
{
DS18B20.requestTemperatures();
temp_0 = DS18B20.getTempCByIndex(0);
* Send Sensor data to Blynk
**************************************************/
void getSendData()
{
DS18B20.requestTemperatures();
temp_0 = DS18B20.getTempCByIndex(0);
Serial.print(“Temp_0: “);
Serial.print(temp_0);
Serial.print(temp_0);
Blynk.virtualWrite(10, temp_0); //virtual pin V10
}
fatina aisyasays:Hi there,
Nice sharing. Now i working on ultrasonic sensor with nodemcu. i want to get notify if the distance reach at certain range. how i can use this code to implement as hc-sr04 ?
gert-jan vanhaelewynsays:Nice sharing. Now i working on ultrasonic sensor with nodemcu. i want to get notify if the distance reach at certain range. how i can use this code to implement as hc-sr04 ?
Beste, ik krijg een error met
SimpleTimer.h: No such file or directory
en een error ook met dht 11 hoe komt dat?
mooi project
grefmasays:SimpleTimer.h: No such file or directory
en een error ook met dht 11 hoe komt dat?
mooi project
can i send email to my smartphone, when i use lokal server?
Karinsays:hi. i would like ask a question.
Can you tell me, how to send an email/notification just twice a day ??
bcause i try your code :
“//Blynk API call for EMAIL sending
Blynk.email(“[email protected]”, “ESP8266 Alert”, “Temperature over 28C!”);
//Blynk API call for NOTIFICATION pushing
Blynk.notify(“ESP8266 Alert – Temperature over 28C!”);”
bcause i try your code :
“//Blynk API call for EMAIL sending
Blynk.email(“[email protected]”, “ESP8266 Alert”, “Temperature over 28C!”);
//Blynk API call for NOTIFICATION pushing
Blynk.notify(“ESP8266 Alert – Temperature over 28C!”);”
this code always send the email/notification everytime. And thats too many for me, bcause just in one time it can send 10 or more email/notification.
Please, Can you Help me ?? >.<
Akshay Kashyapsays:Please, Can you Help me ?? >.<
Why it is so that the notification comes again and again despite of the fact that it is presssed ok?
Illionisays:Hi, can you show me how to add blynk notification in arduino uno and nodemcu esp8266? I got stuck on this project. Please help me
Elijahsays:What IOT protocol is blynk working working with? Thanks
Shahnaz Maliksays:My name is Shahnaz Malik, I bought mobile from Blynk Company online on 14/12/2019, blynk company called me and said this mobile has a 6 month warranty and you can show it at any Apple store when the phone comes with problems. Should be Within 2 months my mobile battery was swollen, no one would listen to the complaint, if inadvertently if the mobile gets blasted or if I face any problem then who will be responsible Apple company or Blynk company give me the answer.
Adisays:Hi Vaduva,
I’ve tried to sketch from you, but i got a little error on compiling In file included from /Users/adi/Documents/Arduino/libraries/ESP8266WiFi/src/ESP8266WiFi.h:33:0,
from /Users/adi/Documents/Arduino/email_notification/email_notification.ino:6:
/Users/adi/Documents/Arduino/libraries/ESP8266WiFi/src/ESP8266WiFiType.h:26:10: fatal error: queue.h: No such file or directory
#include
I’ve tried to sketch from you, but i got a little error on compiling In file included from /Users/adi/Documents/Arduino/libraries/ESP8266WiFi/src/ESP8266WiFi.h:33:0,
from /Users/adi/Documents/Arduino/email_notification/email_notification.ino:6:
/Users/adi/Documents/Arduino/libraries/ESP8266WiFi/src/ESP8266WiFiType.h:26:10: fatal error: queue.h: No such file or directory
#include
^~~~~~~~~
compilation terminated.
exit status 1
Error compiling for board Arduino Uno. Could you please help me. Thank you
Ignace Vandeveldesays:compilation terminated.
exit status 1
Error compiling for board Arduino Uno. Could you please help me. Thank you
Hello,
I want to send an email fron my esp8266 with a textstring and a value of the batteriestatus (VCC) but I donn’t know what’s the syntax for it to merge both things into the same message. Sending an email with only a txtstring works well here. Btw the function to know the status of the accu is verry pretty done only with a code, super function because otherweise you must adding resistors etc. to your project. Many tanks for your soon answere and tips!
Johnsays:Hello. With your code above how to you make it have a high limit so if temp is over the set point a email is sent and then a low limit so then if the temp is below the setpoint an email is sent?
Gary Bennasays:Hardwaregrowler 2 1 – Notification For Hardware Status Changes Notification
I am using two esp8266 modules with my Blynk project. One is esp8266-01, the other esp8266-12e. I am getting sensor readings with the -01 and using bridge mode to send them to 12e.
Bridge1.virtualWrite(V5, aValue); is sent from -01. It is received on the -12e and I assign the widget to V5 and then use
BLYNK_WRITE(V5){
int pinValue = param.asInt():
Blynk.virtualWrite(V5,pinValue;}
I use Blynk.syncAll(); to update the values.
I have included the notification widget in the Blynk app and am trying to get a notification if pinValue gets too high or low so I write
Bridge1.virtualWrite(V5, aValue); is sent from -01. It is received on the -12e and I assign the widget to V5 and then use
BLYNK_WRITE(V5){
int pinValue = param.asInt():
Blynk.virtualWrite(V5,pinValue;}
I use Blynk.syncAll(); to update the values.
I have included the notification widget in the Blynk app and am trying to get a notification if pinValue gets too high or low so I write
BLYNK_WRITE(V5){
int pinValue = param.asInt():
Blynk.virtualWrite(V5,pinValue;
if(pinValue 75){
Blynk.notify(“reading is above 75”);
}
}
I have intentionally set the reading above and below the parameters, but no notification.
do you have some suggestions?
int pinValue = param.asInt():
Blynk.virtualWrite(V5,pinValue;
if(pinValue 75){
Blynk.notify(“reading is above 75”);
}
}
I have intentionally set the reading above and below the parameters, but no notification.
do you have some suggestions?
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