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Questions tagged [blynk]

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

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

26 questions
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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 I turn off the WiFi while the program is running,…
Coder9390
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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 board along with the GPS module. I am also…
maheshmt
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2 answers

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 (Or something stupid I'm missing). Any ideas?…
Randomaker
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1 answer

How to use millis instead of delay?

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 activates when I press a button on the Blynk app, it…
Coder9390
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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 screwed up the placement of setup(), loop() and other…
Shane Petschonek
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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 Arduino for further processing and I need it to be…
coder-ari
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1 answer

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 an ESP32, a plug-in water heater, and an AC relay board. The ESP32 controls the relay board, while the water heater is plugged into the…
user3211857
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Arduino wait for incomming data from blynk terminal

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 BLYNK_WRITE(V0) { String i = param.asStr();…
Time Gold
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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. Thank you. Here's my code BLYNK_WRITE(V0){ int…
Time Gold
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1 answer

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 probably when WiFi ON but I have question How I can…
AbuWeSaM
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0 answers

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 read x and y values from joysticks in blynk. I am…
Informal Limits Lad
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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 there was a cause:4, boot mode:(3,6) wdt reset. I…
Zack Beucler
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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 DFR0535 solar power manager and 3.7V battery. My…
Roelof Loots
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1 answer

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 connected and working properly. My ultimate goal is to…
turty_k
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1 answer

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), but through the code i manage to switch from mode…
Galinho Salonica
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