Questions tagged [blynk]

IoT platform to connect your devices to the cloud, design apps to control them, and manage your deployed products at scale.

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NodeMCU wont connect to Blynk

My NodeMCU wont connect to Blynk with my code but works fine with example code and same auth token and WiFi info. Cant figure out why its not working. Must be something in my code interfering with it (...
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2 votes
1 answer
127 views

How to attempt connection to WiFi only once?

I am working on a garden timer project, I connect to WiFi once and if its successful show time from NTPClient or else show time from RTC. I have been done the above, and it works in the sense that if ...
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1 answer
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Node MCU not functioning correctly

i have a node mcu and i uploaded one example code to test it for rf signal decoding it worked. so after that i have written a code based on that and when i uploaded the code my node MCU suddenly isn't ...
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1 vote
1 answer
264 views

How to use millis instead of delay? [duplicate]

Sorry if something similar has been answered before... I am working on a garden timer project that runs on a ESP8266 based NodeMCU and is integrated with Blynk. I have a waterNow function that ...
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  • 452
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1 answer
1k views

Blynk, but continue program if Blynk connection fails

I'm having an issue with Blynk.begin(auth, ssid, pass); The problem is, when it fails to connect to the wifi, the rest of the program does not continue. I'm using a Wemos D1 and it is also controlling ...
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1 vote
0 answers
106 views

Need help - skipping over some serial.print statements

I have a project I'm working on for a chicken coop. I want to control the door with timing of the sunrise and sunset. Also looking to a few other things but somewhere along the way, I must have ...
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1 vote
0 answers
207 views

Maximum baud rate for sending a byte of data via SoftwareSerial from master Arduino UNO to slave Arduino UNO

I am trying to read data from a Blynk widget via ESP8266 and Arduino UNO and trying to send it to another slave Arduino UNO. But, the problem is the data is taking some time to reach to the slave ...
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1 vote
1 answer
283 views

How to override automatic control in Blynk app?

I am a beginner to Blynk, and have successfully built a simple water temperature control project. It consists of ESP32, a plug-in water heater, and an AC relay board. The ESP32 controls the relay ...
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1 vote
0 answers
52 views

Arduino wait for incomming data from blynk terminal [duplicate]

I need to add wait command in code where it waits the next input value from blynk terminal to arduino? How can I do that? please help, I will appreciate your help, Thank you. Here is my code ...
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1 vote
0 answers
376 views

Read from Blynk terminal number to arduino

I have a problem in sending numbers from blynk terminal to arduino serial monitor. When I send any number from blynk terminal the arduino always getting 1. How can I get any number please help me. ...
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1 vote
1 answer
256 views

How I can send data information without work WiFi to LCD?

Hi everyone I am beginning learn coding and the second language English. I have small project I use Arduino uno , esp8266 , dht11 , lcd I2C and use blynk app in my project I have the code and work ...
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1 vote
0 answers
476 views

Esp32(Arduino Core) + Blynk Wifi Connection Problems

So I am making a football playing robot which consists of 3 servo motors. Currently,i am only checking only a single servo(myservoKicker)which is operated via button in the blynk app and trying to ...
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0 votes
1 answer
107 views

Adding WiFi to my Arduino Keypad Lock

I'm a really passionate beginner with arduino and electronics and I've built a Keypad lock for my room's door (inside the house). I've used an arduino that activates a motor using a transistor to ...
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1 vote
0 answers
1k views

Blynk.Begin(auth, ssid, pass) causing watchdog reset

I am trying to follow this tutorial and I keep hitting a problem repeatedly. I checked in my code that every time it hits the line Blynk.begin(auth, ssid, pass);, the serial monitor shows me that ...
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0 votes
1 answer
67 views

Esp and blynk app

It is possible to control one relay using Blynk app and also using an atmega? To a better understanding think at a relay that will turn on a fan when you use the blynk app. but when you don;t have the ...
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2 votes
0 answers
2k views

Using 2 serial ports on NodeMCU

I am using a NodeMCU ESP 12E board which will be programmed using the Arduino IDE. I intend to use it to send GPS data to the Blynk app server. I also want to interface a Bluetooth module HC-05 to the ...
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1 vote
0 answers
369 views

Arduino Pro mini does not wake up after a few interrupts from DS3231

I hope someone can help me. I'm building a GSM water level meter that runs on solar power, using an Arduino Pro mini, a DS3231 RTC, a JSN-SR04T - ULTRASONIC SENSOR, and a SIM800L along with a DFrobot ...
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1 vote
1 answer
1k views

Device is not online yet while trying to connect Arduino uno (with USB) to Blynk App

I am trying to run my Arduino Uno using Blynk app. I have Arduino IDE , Blynk library on the same folder within the Arduino library folder, changed the AuthCode using the one provided , checked all ...
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  • 113
0 votes
1 answer
299 views

Management issues through Blynk

I wrote a sketch for controlling the stepper motor under the controls of the Blynk application, the sketch was compiled but there was a problem in that no control was taking place. Receipts and ...
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0 votes
1 answer
761 views

Combining two code of two sensor in one program

I'm using two sensors, which is Galvanic Skin Response sensor and Heartrate sensor. The problem is that when I combined both of the codes, the only output that is showing up is from Heartrate only ...
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  • 3
0 votes
1 answer
1k views

ESP8266 too many argument to function

My project uses ESP8226 to allow: 1) user to set an alarm. 2) after 20 sec of the alarm ringing, it will notify to phone via blynk app using motion sensor. 3) after 40 sec it will turn off ...
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  • 1
2 votes
1 answer
220 views

Blynk app, DotStar bluetooth control code help

This is my setup: Arduino Mega; HM-10 bluetooth module (bought off ebay, so not sure if genuine but works); Adafruit Dotstar addressable LED strip; iOS Blynk app; Hardware-wise, everything is ...
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  • 21
0 votes
1 answer
142 views

Changing outputs infinitely for no reason

Im a student and working on a arduino project for IoT competition and me and my team have built a house and I made this code below. For some reason when I upload it to my Arduino MKR1000 it constantly ...
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  • 103
0 votes
1 answer
785 views

Notifications in constant loop (Blynk) trying to trigger along with serial function

This is an extension from a previous thread that was getting lengthy and off the original topic. I have the following code which monitors the state of a float switch (high or low). I upload the sketch,...
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  • 107
0 votes
3 answers
1k views

How to use the HC-05 properly?

It all started when I was working on my Arduino project, which involves an Arduino Nano, an HC05 module and a bunch of sensors (DHT 11, soil moisture and LDR) with Blynk App. Everything worked as it ...
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1 vote
1 answer
3k views

Update button state in Blynk app through the code

I'm using Blynk along with a WeMos D1 R2 and i can change modes through an ON/OFF button. I can succesfully change mode and make my application go from mode 1 (irrigation) to mode 2 (Fertilization), ...
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0 votes
1 answer
482 views

Problem with action that should happen in loop(continuously)

I’m using WeMos D1 R2 and latest Blynk library and app. I am also using Arduino IDE 1.6.13. I am trying to read a button from the app, which works fine, but i want to read it continuously. Through the ...
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