Questions tagged [nodemcu]

For questions about NodeMCU, an open source IoT platform which includes firmware for running on the ESP8266.

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12 views

Not able to upload code to NodeMCU

Im now working on a Node MCU based project but the problem is that i cannot upload the code to the board. Further more whenever i connect the usb to the NodeMCU my keyboard stops working and only ...
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1answer
24 views

I'm working on a NodeMCU project and have a small doubt about LEDs and resistors

In my NodeMCU I want a statement to turn on an LED, which is easy, just use pinnumber, HIGH. But, what I'm trying to do here is connect multiple LEDs to one pin like this: I just wanted to know if ...
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1answer
26 views

Arduino Pro micro Serial communication problem with Node MCU

I recently bought an ATmega32U4 based Arduino Pro micro. I am using the Keyboard library and interfacing with my PC via USB. I am trying to create a serial communication between the Arduino Pro micro ...
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43 views

Problem with ESP8266 Get Request and DMD2 Library

I am using ESP8266 to download information from server using simple get Request and DMD2 library to draw them on display. Problem I have is, that when I call dmd.begin() after some time ESP8266 will ...
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13 views

MAX31865 & NodeMCU RTD Low Threshold and Exception

I've got a NodeMCU V1 and a MAX31865 with a PT100 attached. When using the example arduino code, it seems to log out the correct values but with an RTD Low Threshold error like so: RTD value: 8068 ...
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1answer
48 views

Voltage, current measurement from solar panel using INA219 and ESP-12F

I recently started tinkering with ESP-12F thus I am a novice here. As a standard novice project, I am making a standalone weather station for my living room. I want to use solar panels to charge the ...
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0answers
27 views

Node MCU code is stuck in while (WiFi.status() != WL_CONNECTED)

I am using the Node MCu V3 board ESP8266MOD Board Manager Version: 2.7.4 Arduino IDE: 1.8.12 My code is stuck in the while (WiFi.status() != WL_CONNECTED) Here is code: #include <ESP8266WiFi.h> ...
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0answers
33 views

Converting Arduino code to Node MCU code

I'm doing a project on controlling my house appliances with Blynk app and a ir receiver.So basically i can control my lights and fans with The Blynk app and an IR remote as the one used for TV. So i ...
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37 views

Wemos d1 mini code not uploading

I have a wemos d1 mini. I uploaded a code in wemos d1 mini and after that my wemos mini not working. I tried to upload another code in it even the led blink sketch and even a blank sketch but whenever ...
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15 views

using esp8266 to fetch specific data from firebase

I want to fetch specific data from firebase using Node Mcu ESP 8266. I can fetch the num value, but I failed to fetch the id value. The serial monitor kept displaying 0 when I try to fetch the id ...
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0answers
42 views

Looking to interface height and weight sensor based on I2C Protocol

I have interfaced a height sensor and a weight sensor. The I2C address of the height and weight sensors are 0x29 and 0x2A respectively. I have merged the example of both the sensors. This is the first ...
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1answer
43 views

NodeMCU, Failed to compile code because of multiple library errors

i was getting multiple errors and cannot able to figure out what it is Arduino: 1.8.13 (Windows 10), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, Flash, Legacy (new can return nullptr), All ...
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1answer
40 views

Remove a sudden pulse on pin d3 of nodemcu when powering it up [duplicate]

I am using node mcu and a 2 channel relay connected to the motor via pin d3. When I power on the circuit, it shoots a pulse to the relay and i think it will damage the motor. Please suggest me how to ...
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0answers
33 views

I2C protocol doesn't work properly

I am trying to make I2C Communication between NodeMCU and arduino Uno boards. However it is not working properly. It makes communication for once time when i uploaded code. Master Device Code(NodeMCU ...
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2answers
63 views

How do I know when filter coffee machine is finished by using any sensor? [closed]

I have a filter coffee machine that seems like the following link ; https://www.electrolux.com.tr/kitchen/small-kitchen-appliances/coffee-makers/coffee-maker/ekf5300/ and I would like to send a ...
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0answers
49 views

Nodemcu OTA - no response issue

I was trying to use nodemcu for a project. No issues when uploading the OTA sample code. Added led blink to test. But when trying to upload the second sketch via OTA getting an error no response from ...
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1answer
25 views

Serial communication between nodemcu and Arduino Uno

For the last days, I am trying to establish serial communication between nodemcu and Arduino Uno but I failed to do this. Currently, I am working on a Home Automation project. I receive data from ...
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1answer
51 views

NodeMCU ESP8266 Ver 0.1 not powering on with VIN

I'm trying to power on my NodeMCU ESP8266 Ver 0.1 (thats what is written in board), via VIN and Ground with my phone charger. I'm 100% sure that the USB charger is working, providing 5V, and that the ...
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0answers
22 views

GET data from influxdb database on LED matrix via NodeMCU

I can find tons of tutorials of how to POST data to an influxdb database from a sensor connected to a ESP8266 for example. But I would like to find out how to build it the other way around, for ...
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2answers
71 views

esp2866 powered externally not working

I got a beginner level problem. I got two esp2866 nodeMCU, they both work with the usb cable and I can get the blink program to run though it. Running them with external power doesn't seem to work ...
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1answer
40 views

Ultrasonic Sensor(HC-SR04) recording random distance

I am am trying to make a code which automatically controls relay on basis of ultrasonic sensor measurements. I am using a nodeMCU as a microcontroller rather than an arduino. The relay and the ...
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0answers
33 views

How to combine a RFID attendance system and proximity sensor alarm system

I am currently working on my final year project that involves a basic rfid attendance system and a proximity alarm system. The project intends to prevent ManOverboard situations by warning people who ...
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0answers
38 views

Error compiling for board NodeMCU 1.0

i tried compiling a program to upload sensor readings that i connected with my ESP8266 to cloud (in my case, Antares) but i keep getting this error message. Can anyone tell me where the problem is, ...
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2answers
56 views

Is it possible to have long wire connections from an NodeMCU to a servo motor or button?

For my proyect, I need to conect my NodeMCU to a servo motor as well as a push button, the thing is, the distance from the NodeMCU and both components has to have a distance of around 6.10 meters (or ...
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0answers
50 views

NodeMCU unable to communicate with MFRC522 RFID reader even though the nodeMCU is successfully connected to a mobile hotspot

I am replicating a project that will read the RFID card or tag data, store that into a mysql database and display the data via PHP. I am using NodeMCU, RC522 RFID reader and Ardunio IDE to do that. ...
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1answer
77 views

use Nodemcu to program Attiny85

I have a dev board for my attiny85. when connecting it to the computer I get "unknown USB device(device descriptor request failed)" although I have the needed drivers, so I thought of trying ...
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0answers
72 views

My nodemcu esp8266 is heating a lot and the on board LED of gpio16 is On continuously. What's the Reason of heating?

How it happened Recently I was working on a device with Blynk application in which my device will burn crackers using Blynk. I wanted to create a safe environment for burning crackers. There was a ...
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0answers
26 views

How can I power off a servo the best way? Problems with MG90S servo [duplicate]

I have a NodeMCU and im trying to control a servo to move from angle A to B and viceversa. The thing is I want to be able to power off the servo after moving so it could stop getting voltage and ...
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1answer
112 views

No SPIFFS only OTA in NodeMCU ESP8266

I have a NodeMCU ESP8266 ESP-12E and I tried uploading a file thru the SPIFFS. I am not sure why I see OTA instead of the SPIFFS? Is there a configuration that I missed?
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1answer
53 views

Why Windows 10 does not see Nodemcu device?

I am using a Windows 10 laptop. Behind the nodemcu it says that download CH340G driver. I already had arduino ide and the esp libraries were already installed because i was using a esp8266 01 device ...
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0answers
48 views

Hijack analogue doorbell chime to trigger nodemcu

I have an oldskool doorbell chime. What i would like to do is whenever there's a voltage flowing through the doorbell also trigger an HTTP call, which will trigger some smart home automations. I have ...
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0answers
85 views

Can't upload sketches or flash Nodemcu 1.0 12E (CP2102) but have drivers and responds to RST on Serial monitor

I've been trying to get my nodemcu working for months and tried countless online references but none worked. I'm using the Arduino IDE to upload sketches and always get the error "Timed out ...
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0answers
79 views

Multi tasking alternative on NodeMCU ESP8266

I'm trying to make an RGB LED strip controlled via Wi-Fi and IR. Until now, I just have made the Wi-Fi server, and It worked just fine. But I wanted to be able to turn the LED strip on and off via IR, ...
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71 views

Simple wifi scan networks doesn't work on ESP-01

I can't figure out why, but my very simple wifi scan code doesn't work on two pieces of ESP-01. At first I thought, about bad or burn out MCU, but none of my two ESP-01 and can not find nearby wifi. ...
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1answer
74 views

How to program Esp8266 remotly via wifi?

I hope it's not a sci-fi for arduino. But I saw that dual system with two MCU can program each other via radio connection. It has been done in experimental space cube projects. It is theoretically ...
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1answer
115 views

NodeMcu 1.0 resets automatically after sometime

I want to show some digits in a 3x3 p10 red led pannel where the number will come from the cloud and the number keeps updating. For this I have used esp8266 based Nodemcu. I have used WiFi Manager ...
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0answers
24 views

Can't send Twilio SMS using Nodemcu esp8266

I am using Twilio for sending SMS in my project. I am measuring temperatures and if the temperature is too high, an SMS is sent. In my code I also have a read and a push to Firebase Realtime Database. ...
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44 views

I can't see any readings from my pulsesensor what can I do?

I have been using NodeMcu board for my project with a pulse sensor, DH11 sensor, and temperature sensor. Everything has worked well in spite of the pulse sensor. It doesn't show any readings that ...
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0answers
30 views

RS232 server client connection over nodeMCU

I have two devices that communicate between them over UHF radio, the radio is hocked up to the serial port, the device use RS232 protocol. I would like to use a couple of NodeMCU to connect the two ...
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0answers
47 views

ESP8266 NodeMCU running out of heap

I'm trying to create SMS alarm using Twilio, Firebase and Arduino IDE. Using sensors I am measuring the temperature. If the temperature is higher than a specified value (ESP reads that value from ...
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1answer
42 views

Serial Communication, if statement not working

#include <SoftwareSerial.h> SoftwareSerial my (D6,D7); //(Rx,Tx) String msg; void setup() { Serial.begin(115200); my.begin(9600); } void gas() { Serial.println(msg); if (msg == "0&...
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0answers
62 views

Unable to allocate memory

I'm trying to send a SMS and read data from Firebase with my NodeMCU Amica V2. The code works fine when I either only send a SMS or only read data from Firebase. However, when I combine this two ...
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1answer
265 views

Why it shows d2 was not declared in scope

#define BLYNK_PRINT Serial #include <SPI.h> #include <ESP8266WiFi.h> #include <BlynkSimpleEsp8266.h> #include <SimpleTimer.h> #include <DHT.h> #define BLYNK_PRINT ...
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2answers
166 views

Error reading from PROGMEM

I was trying to run a code from this https://circuits4you.com/2018/03/10/esp8266-jquery-and-ajax-web-server/ I am pasting it here. /* * ESP8266 NodeMCU jQuery CDN Demo * * https://circuits4you.com ...
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1answer
28 views

Can you power the ESP8266E-12 with any of the 3.3V pins?

If I want to operate the NodeMCU on the 3.3V input with 2.5V to 3.6V; can I use any of the 3.3V pins to do so?
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1answer
130 views

ESP32 start BLE after deep sleep

I'm new to using the esp32 as a microcontroller. I'm currently working on a so-to-say remote control. Since I want to use the esp32 with an external battery I need to put it in deep-sleep after I ...
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0answers
66 views

Unable to upload code to ESP 12E

I'm using an ESP 12E with a usb connector. I'm curtain the usb cable is working fine since I'm able to use it on other boards. When unplugging and plugging in the use, the port picks up the board as ...
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1answer
86 views

L298N Motor Driver with Nodemcu/ESP32

I have seen a lot tutorials on L298N motor driver with nodemcu and ESP 32, which are 3.3v logic boards where the motordriver is a 5v logic board, now in Arduino while doing speed control 255 means 5v ...
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2answers
40 views

How to connect neo 6m 6pin module with nodemcu v3

I got this neo 6m gps module from a broken drone. and i would like to connect it to nodemcu v3 board. most of the gps module that i have seen are with 4 pins (vcc,gnd,tx,rx) , but this module has 6 ...
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0answers
55 views

EEPROM Arduino library for ESP8266 is not working

I am trying to use EEPROM library from Arduino framework for my ESP8266 project (NodeMCU). I am using Atom with Platformio. Initialization of EEPROM is attempted at void setup() in main.cpp: EEPROM....

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