[README] Welcome to Blynk Community!

Hey, welcome to Blynk Community.

This is the best place to ask questions, leave feedback and share your ideas.
If this is the first time you hear about Blynk, check out our website and come back!

As the community is big (and growing), let’s agree on some basic rules.

Asking for help

Before creating a new topic and asking for help, please check if your question was already answered:

  1. Use forum search function
  2. You may want to check out:
    Blynk Documentation
    Blynk Wiki
    Blynk Examples Browser
  3. Do not duplicate questions (keep posting in existing, relevant topics)
  4. Be specific: describe your question, hardware you are using, post your code and logs, etc.

All code snippets should be formatted

Do not post your code blocks without proper formatting.
How to do that:

If you have already posted some code without formatting, you can edit it: find an edit button just below your post


  • Ensure a friendly atmosphere to other community members (NO spam, trolling, harassment, etc.)
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  • Comply with existing laws
  • Encourage freedom of expression and exchange of information in a mature and responsible manner
  • Use English as a main language. If you need to post in your native language, read this. The forum is international (interactive map is here):


As a member of our vast forum community, you must participate responsibly.
Violating these simple principles, you may expect to be ignored, banned, or have your account deleted, with or without a warning.
Also, if you see someone violating the rules, you should flag the post and inform the author about the incident (include link to this post).


Here is a really nice article by Eric Steven Raymond, that can make you a really cool community member!
How To Ask Questions The Smart Way

I am bigginer and i need help
No Wi-Fi connection
How to display temperature on Blynk? - DS18B20 + 2x16 display
Wemos d1 mini code question
I need to help with Video Widget
Arduino Bluetooth HC-05 with pushbutton notification
[SOLVED] Sketch takes too much space
Every time i loose internet connection the door goes up
Reset the board/ power failure/ internet off/ wifi router reboot, the device is pushing the selected gpio
Wemos ESP8266 Standalone D1-R2 / DS18B20
ERROR Input/output error
3 pieces ESP 8266, 1 piece of oled and 1 piece of application
Run DC motor clockwise, counter clockwise and Stop
Arduino Nano Blynk and OLED I2C
(Make) ESP8266 automatically connect to the wifi and blynk servers (after disconnection)
Need help with blynk and other loop function combining together
Can't Connect my device to Local server
Change state of graphical buttons on bynk by another button command
Double serial communication on arduino Due
Blynk + Wemos D1 mini + TMP36
Đồng bộ hai nút nhấn vật lý bị treo không điều khiển được sử dụng ESP32 DEV
Switching Relay time Project
ESP8266 to ESP8266 Communication with Blynk Bridge
Need help with NodeJS
[SOLVED] Problem with Time library and Time input controller
Connecting to - SIM900+Mega2560
Blynk v0.5.3 with TinyGSM 0.3.5 libraries, modem does not respond
Arduino Mega+HC-06+LED+DHT11
Need help with Blynk (using Arduino and ESP)
Armbot - Delay Problem
Problema con Infrared sensor
How to get Blynk working with Arduino and IOS
Lost connection with blynk after a while sensor DHT22 + esp07
Need help with the code of nodemcu
Exit status 1 Error compiling for board NodeMCU 1.0 (ESP-12E Module)
Particle photon relay shield help
LCD widget interfacing to 5110 or OLED
Blynk, ESP8266 with pin interrupt
Help with Virtual Pins
Joystick Issues over bluetooth
Read a digital pin, using LCD widget
Optical Dust sensor , Arduino UNO, ESP 8266 and BLYNK
(DHT11) Incorrect temperature and humidity reading
The smallest Wifi smartphone controlled 4WD car using ESP8266, Blynk and Arduino Code
Servo , dc motor speed
Humidity control in the garage and cellar. WEMOS MINI PRO
Connecting to error
Displaying a Analog Value to Blynk APP via Virtual pins
Dht11+arduino mega+gauge
(DHT11) Incorrect temperature and humidity reading
Dht11+arduino mega+gauge
How to control esp8266 and led with physical and blynk button?
Connection to Cloud server
Webhook прблема
SOLVED: Any timer kills my sketch (ESP core version)
How do I use Virtual Pins?
BLE connection with Arduino 101
Arduino choice of ethernet shield?
Arduino mkr 1010 rimane nel setup - Troubles using Blynk.config()
ESP8266 HVAC control
[HELP] Ardruino UNO is offline
Arduino + ethernet + dht11 + eventor
Blynk for Beginners and help with your project
DHT11 with Bluetooth?
Want to improve my programming skills need help
NodeMcu-Invalid auth token
Blynk energy payment
ESP8266 HVAC control
Esp8266 is not running code
New nodemcu keeps "Connecting to"
Notify and email widgets-too slow
Motor Control with Raspberry on Blynk App
Compile issue moisture sensor ESP8266
ESP-13 integration with Arduino Uno
[SOLVED] GPS TRIGGER can use as a pin TRIGGER can use as a pin restriction
Data pin4 > Virtual pin
LC Technology ESP8266-01 Relay modul
LED and LCD widgets
App preview on android with Esp8266
NodeMcu ESP8266 Wifi IR Blaster does not work
Trigger relay specific times of day
ESP8266-01 won't work with Blynk
Problem all pins go on when shield ethernet reconnect
Arduino + ESP8266 Connected to Server but no Datatransfer
Inductive sensor
Blynk Time input setting
Blynk rtc hangs up
How to set static ip and mac address for esp-01?
Blynk, Touch Sensor and Relay
Raspberry Pi Zero W controlled by Blink
I want help
Concurrent BLYNK_WRITE's
RPI disconnect after 30/40 minutes
Avoid Delay
DHT11 + Ethernet W5100 + Controlling Ac Fan OFF/ON
RPi Blynk Temperatur/Humidity Sensor
Combining two widgets
(Solved) Help with coding notification delays
Soil moisture value opposite
Message in Blynk
Blynk interfering with Bluetooth Serial on ESP32
TV on/off (arduino board/IR)
Using virtual pin to start the instructions (activate motor controller)
[SOLVED] ESP8266 local server issue
ESP12F + Blynk + Physical Switch
Newbee in need of help please
Code analog read A0 with arduino yun
LED widget won't work
How to replacing (properly using) millis function
Motion Detector issues
Arduino D1 wifi: rst cause:4, boot mode:(1,6),wdt reset
My arduino cannot connect to cloud
Problem is that, when wifi off, all switches remain ON as on connection
Constant disconnects from Blynk server with attached code (using UltraSonic Sensor)
Problems publishing play store
Local server invalid token
Error ISR not in IRAM!
Need help adding usb Dongle to Blynk using a Arduino Mega adk
Code Example DHT11 doesn´t working
Arduino uno wifi Board and DHT 22
Time Input Widget read problem
ESP32 Tethering from mobile / won't reconnect auto
Múltiples virtual write Reset the esp8266 nodemcu, How to Fix?
Notification repeat
Trouble with BLE blank integrated to project
Blynk and the BME280
Timeout sending multiple parameters
HELP WIth google assitant Blynk and FFTT (to flip flop a GPIO)
[SOLVED] Connecting to blynk-cloud error
Controlling multiple servos and servo driver through Blynk
Synchronization a button with a zerocrossing signal
Automatic water pump - Help
DHT11 NodeMCU Thermostat
I have tried by changing values of pins by passing strings but it not worked plz help me
Problem with nodemcu +DHT11+Blynk
Obtain date and time using esp8266 and display it on blynk
Withdraw slider data ESP32
Can I write my code on the void loop()?
Ich möchte gern mehrere Sensoren über die Virtuellen Pins auslesen, mit einem Sensor Funktioniert es ab 2 Stück nicht mehr
Programm disconnects dozens time a day
STM32F103C8 Based board & Blynk
Need help With My Blynk installation and code
How to send a value from Blynk to Arduino?
Read PM 2.5 sensor data via Blynk virtual pins
Use the My Apps utility for esp32?
Acs712-30A code for DC current
A simple key to enable or disable the app
Blynk + Wemos D1 mini + TMP36
Error compilling board arduino/genuino uno please someone should help me with my project
Time problem on my project
Email when virtual pin is pressed
Compiling Errors
ESP8266_Lib.h:39:7: note: in expansion of macro 'ESP8266'
Error code explanation please
[SOLVED] Blynk.sync*** not updating state in Setup code
How to connect Blynk to my Sparkfun ESP8266 thing?
Nodemcu relay and blynk problem
Virtual pins help
Macro_fail: compile error on Zero (and probably other platforms)
Blynk Terminal does not show the reply from arduino
How to connect to BT and print data from Blynk to IDE serial monitor?
DS18B20 value -127º, but only when connecting to Blynk, on ESP32
How to control DC motors using Blynk with Arduino..?
Need help with ESP-01s and Arduino Nano
Need Custom Firmware for Sonoff
Blynk Alert
NRF24 to blynk
Change SimpleTimer for BlynkTimer
Push Notification won't work
Need Help
Wemos Mini with DHT11
Upload code to wifi shield
[duplicate] Connecting to
Controlling DC motor via USB
Relay activation via physical button using an MCP23017
How to get past (Twitter doesn't allow identical subsequent messages. )
WiFiManager Invalid auth token
Arduino bluetooth 2 wheel dc motor car
Blynk protocol?
RTC Widget does not run
Virtual pins to control bits?
Need Help
One of the "LABELED VALUE" display does not work -- HELP -- HELP
Add more LED and physical button in this sketch HELP!
Logging Data with ESP32 Deepsleep and updating app when open
BMP180 Atm
Hii I am very new to Blynk please help me
Blynk and Library ICMPPing.h - Connection Loss
Sending data from hardware to Blynk
[SOLVED] After v5.0 update get error
Blynk Time input - lost connection to app
Need help device is always offline
Set "Alarm ON" and "Alarm OFF" with Terminal Widget
NodeMCU with 10x multiple DS18B20 Temperatures
Need help with soil moisture sensor
Error while Connecting Arduino Mega 2560 and Sim900A with Blynk
Not getting the location from my GPS project
Button does not work with sensors
Arduino101 BLE Board <getting started> nothing working
Problem with push notifications (on RPi - WiringPi)
Control servo with a button in a Raspbeery Pi 3
Superchart не запам'ятовує налаштування відображення
New! Alpha version of the blynk-library for Python!
I am a beginner need project help (Synchronizing Widget Button with Physical Button State)
Please help me!
Keyestudio HM-10 Shield & Blynk - Making it work with Uno and Mega
Self-updating ( from WEB server HTTP ) OTA firmware for ESP8266 AND ESP32!
Raspberry Pi B+ is offline (Using WireingPi)
AC Voltage Measurement
I need help in a college job
Sending Multiple Values using Blynk Timer - Updated Code
Error - esp is not responding
{GPS MODULE + ARDUINO + Esp8266} Push sensor code running only for 10 seconds. Need help with Blynk timer
Bridge virtualwrite problem
Trouble connecting to Blynk from RPi
Virtual button and send data do not work together
Bluetooth connection issues with app update
Blynk + Email (Arduino UNO with Adafruit WINC1500 WiFi Shield)
GPS Trigger not working
Leonardo + A7 module
Combining two sketches, help needed
I m trying to get email notification when fire detected ...but i m not is my code please correct me
My NODE MCU goes online and then off line every few minutes
Problem with my project (Python)
Dynamic provisioning
Controlling Stepper motor with wemos D1 mini using l298n motor controller
Blynk app vs Esp8266
After import BlynkLib, import RPi.GPIO as GPIO not working?
ESP32 timer gets disconnect all the time... Don't know what to do
Problem analog to virtual pin
Timer in blynk
Raspberry Pi client disconnects after 20 seconds
I'm in trouble using notification TnT
Can Blynk set push notification start & stop time for ESP8266+PIR?
Issue Connecting HC-06 with Arduino Mega
Can't connect to blynk-cloud anymore
Need help for push notification
Reading state of virtual Push Buttons
Can add multiple LED with delay blink
Blynk connection cuts off often
Esp8266 to aurdino mega error
Arduino uno+esp8266 not connecting to cloud server
Guidance on feeding Blynk token through wifimanager webpage
Blynk App and HM-10 are connected but it doesn't turn on LED
Blynk, Arduino and 433 MHz RF
Sensor light notification push
Servo run in one direction instead of following slider movement
I need to set timers for relay with esp-01
Esp-01 + arduino uno
When device turn off , and then turn on again the Blynk app on mobile tell me the device is offline
Blynk Slider value Set
A simple key to enable or disable the app
Trying to integrate Processing with Blynk and Arduino
Slider settings. Масштабирование
Cant connect to blynk server
Terminal long string disconnection issue
Using virtual pin to shutdown raspberry pi (Using WiringPi, C++)
Compiling error with GSM code
DC Motor Control
Led Widget controlled by a Button Widget
3 DC Motors,1 Servo, Arduino Uno, HM-10
Servo Speed
WEMOS connection to laptop vs only power
Read 2 virtual buttons from the app into an esp8266
Nodemcu with MQ2 smoke sensor
Hello how can i combined two sensor
Using timer.setTimer() function vs. timer.setInterval()
Unable to connect to RFDuino
(Having problems with my libraries) Arduino UNO + GSM + DHT11 + Soil Moisture + RF Transmitter
History Graph (missing)
BH1750 Widget
Disconnection Caused by For Cycle
Sending the Blynk mail when the temperature drops
Blynk manual
Arduino 101 temp sensor ble
Counting Bubbles
[SOLVED] Xmas Lights
[SOLVED] Reliability of connections to Blynk (using Cloud Server over Satellite Internet)
Integrate Led Status into my DHT Sketch
Temperature sensing with Dallas 18B20 and blynk
Adding Servo Sweep to Working Button / Debounce / V-Pin Simpletimer Code on Arduino Uno
BME280 i2c connection issues
Need assistance to program relay control loops
Can't disable echo
ESP8266 connection on Arduino RX / TX Ports ( Ports 0 / 1 )
How to turn on widget LEDs
Problem with Blynk.virtualWrite(Vx, value)
NANO with ESP8266-01 cloud server issue
Blynk energy monitoring via serial interface
Plural use of BLYNK_WRITE
Location of Blynk.config() vs Blynk.connect()
Arduino Due + W5500 lost connection without serial cable
Delay function not working
Sending data from Blynk to thingspeak with Bluetooth
Blynk, AccelStepper, Stepper Motor
I am making follow me cooler
Exmple .ino for esp8268+relay+DHT11
Arduino Due + W5500 lost connection without serial cable
Smart Watering
How to automatically dual SSIDs for redundancy
I would like to know how to keep running code while using the Blynk dynamic provisioning option
Having some problems with compiling
Blynk_Write parameter to enter and break a loop
I want to create a button to press eeprom function for 3 times eeprom, and 3 buttons to send IR
Switch data Send and receive nodmcu esp8266
Controlling 2 D/C motors with ESP8266 and stepper L9110S (HELP)
Local Server/Sim800L
How to run the ultrasonic sensor while the button Blynk V2 is pressed?
Controlling 2 D/C motors with ESP8266 and stepper L9110S (HELP)
No ping while opening serial port of arduino connecting to esp 8266 module
No ping while opening serial port of arduino connecting to esp 8266 module
Help with connecting Blynk to a lsm6ds3 temperature sensor. (Arduino UNO)
Blynk combined with Robotdyn AC Light Dimmer
Blynk timer.setInterval NEED HELP
I need some secure buttons that must be intentional pushed/activated
Water level
[2011] ESP is not responding
Can not send float variable to Blynk IOS app
Sketch did not work
Voice controlled LED strip with Google Assistant, IFTTT and Blynk
Volume of data when I USE Blynk
Use blynk button as an interrupt to the sensors
I need a help regarding my project
Arduino 101 and blynk bluetooth connection
I want to control 1 relay or digital pin from wemos
How to make Blynk.sync ALL after the power loss?
Blynk app Showing device offline using in local server works fine with blynk default parameters fine as worked with other program
Raspberry pi Blynk value display in Python (API)
My IDE aborts compilation and asks for "version.h" library, where to get it from?
I dont't understand button (Try to control the sg90 servo motor through the nodemcu)
Blynk on wemos D1 R2 - disconnections
How to automatically dual SSIDs for redundancy
Blynk.config () не компилируется. Mega+esp8266
DHT11 with moisture sensor using ESP8266
I’m trying to count the time that passes from turning a relay on
Problem with MEGA + ESP - cmd error appears periodically
Blynk not work 19/02/2019
How to configure (connection to) my own blynk server?
Particle Photon breathing green with Blynk
Arducam 2MP/NodeMCU with sensors problem
Nodemcu v1 using blynk
Unable to get the print statement on when the value is 1
Not getting IP - with WS5200 SHIELD
Was not onliine yet error and use of Sparkfun ECG sensor, AD8232
Table widget using blynk write
Not able to program my nodemcu for lot app
Menu widget instead of just go to the next patern with pushing the preset button
Could I Know how to solve
Please help. Blynk.tweet not working!
Why can't I receive email and push notifications
I am getting errors in temperature and humidity meter?
How to add lables when my mega2560 digitalread is HIGH
Server Blynk
Cannot Connect Blynk-cloud in Blynk App