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

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I am trying to send a Json Object from Arduino UNO to NodeMCU using SoftwareSerial. I am using Arduino IDE. I am getting garbage value on Serial monitor of NodeMCU. Tried it with different garbage ...
Muskan Chotrani's user avatar
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Right now I'm trying to understand how I could (easily) power the heater of my MQ-9 carbon monoxid and gas sensor. Here is the datasheet: http://www.haoyuelectronics.com/Attachment/MQ-9/MQ9.pdf It ...
BvuRVKyUVlViVIc7's user avatar
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I want to sent AT command into node mcu esp8266 module with arduino IDE through serial monitor. I connect the node mcu to arduino uno board in following sequence: RX to pin 2 of arduino TX to pin 3 ...
sepehr's user avatar
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I actually have a series of questions regarding Nodemcu and esp8266. How does code typed in Arduino IDE run on Nodemcu? What firmware is present on the nodemcu? How do I upload the above firmware on ...
SAYAM.S SANGHVI's user avatar
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i have NodeMCU with es8266 onboard on it. I read heap and stack memory are facing each other and if heap or stack gets full and reachs another strange things happen. So i am wondering if can we use ...
alphaceph's user avatar
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So I am running my project on a NodeMCU, but I don't know how to let it add a yield in front of an else if. It will give me an error like this: Arduino:1.8.12 (Windows 10), 開發板:"NodeMCU 1.0 (ESP-12E ...
Ted Lu's user avatar
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441 views

Build my own 'Artnet to WS2812b Neopixel' boxes for lighting in a club. Working fine. I have 20 stripes with 50 pxls each. One ESP8266(NodeMCU) is feeding 6 stripes, so it gets 2 DMX universes via ...
Martin Bepunkt's user avatar
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1 answer
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I'll start a project using NodeMCU V3 WiFi Module, which uses esp8266 chip. However, I am undecided as to which library to use. I don't want use a serial bridge with an arduino, I think it is better ...
joaov_machado's user avatar
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144 views

We are developing a Web Console and REST API for the NodeMCU V3 ESP8266, using ESPAsyncWebServer. We are facing some difficulties to serve dynamic pages using File Containing Templates! We're unable ...
Śhāhēēd's user avatar
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160 views

I technically need your help, when I am working on my project, I found out that my server-side cannot send data to the client-side, my server-side is made with WiFiServer(80) so it is when my client-...
Ted Lu's user avatar
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/* Basic ESP8266 MQTT example This sketch demonstrates the capabilities of the pubsub library in combination with the ESP8266 board/library. It connects to an MQTT server then: - ...
sepehr's user avatar
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I am using nodeMCU esp8266 wifi module to send the data received by the ultrasonic distance sensor to the firebase. here is my code: #include <ArduinoJson.h> #include <ESP8266WiFi.h> #...
Tank's user avatar
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Good day. The NodeMCu successfully connected to mobile hotspot when i didn't put any others codes except the Wifibegin etc. Howveer when I include some codes for temparature sensor, it keeps on ...
mocha234's user avatar
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So i have this code that whenever i click a button a interrupt starts. In this interrupt i want to do a get request to a webserver. The thing is seperate the code, the interrupt code works and ...
Thomas Van Raemdonck's user avatar
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#include <ESP8266WiFi.h> #include <FirebaseArduino.h> //Firebase settings #define FIREBASE_HOST "..........firebaseio.com/" //cant share #define FIREBASE_AUTH "..............." ...
Tank's user avatar
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I am working on a project which involves counting the drops falling in a drip chamber of a IV fluid gravity based therapy bottle(saline bottle).I am using IR trans-receiver at the drip chamber to ...
CHETAN NIRADWAR's user avatar
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i am trying to send data from ACS712 sensor which is connected to UNO (3 sensors). Everything works fine on UNO, but when I send only one value from UNO through NodeMCU 12E to MQTT server, it shows ...
zoran perovic's user avatar
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I tried to test NodeMCU ESP8266 with this code from here #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <ESP8266WebServer.h&...
ELIP's user avatar
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3 answers
2k views

I have some arduino code I adapted from a simple 2 button 2 relay code I found online. I just multiplied everything so I could have 5 buttons/5relays. I am using a NodeMCU (ESP-12E) for this. I have ...
Coltography's user avatar
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37 views

I am trying to build a Smarthome system with NodeMCU. NodeMCU would wire up with relays. How many replays can one NodeMCU control?
will free's user avatar
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I'm using nodemcu and neo6m gps module. I can't send data to firebase. As a library using tinygps++. Can anyone please help me how can i pass data to firebase. #include <ESP8266WiFi.h> #include ...
Sayedur Rahman's user avatar
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1 answer
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Hi I am new to IOT and I am now in love with this. However I'm a little confused right now with the jargon. My question is similar to this. But I do have some extra questions though. When using ESP as ...
C. Wagner's user avatar
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1 answer
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I am working on installing an alarm system using Konnected IO on a NodeMCU esp8266. I have multiple bay widows which will use 4 SW-420 vibration sensors. I would like to wire all 4 of the SW-420 ...
Ron Miller's user avatar
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1 vote
0 answers
934 views

I have NodeMCU & ST7789 TFT display. I want to generate QR Code of any dynamic input and display it on my TFT display. Not able to find any suitable reference. All Standard QR code libraries only ...
KAPIL KUMAR VERMA's user avatar
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13k views

Good day everyone,        I am facing a problem when trying to use nodemcu (Nodemcu ESP8266 Lolin V3) to communicate with an RS485 device. I sent an enquiry ...
Harith Ikhwan's user avatar
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-1 votes
2 answers
4k views

I bought a this voltage regulator . DC-DC 5v 8A voltage regulator. ıts supported 8-35V input voltage . And i want to use this with 12v power supply. But i searched on the internet . Nodemcu max amp is ...
Alper Aslan's user avatar
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1 answer
65 views

i there! i have Node Mcu which i want to connected with my home wifi after it it made it own station mode then i want to make it access point for other but now problem is that it is now in both mode ...
sheri's user avatar
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1 vote
0 answers
83 views

I am using a NodeMCU from Amica. I tried interfacing the HC-05 module to the NodeMCU. The following code works fine without any errors #include<SoftwareSerial.h> SoftwareSerial btport(D2, D3);...
Sreenu Murugesan's user avatar
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1 vote
1 answer
828 views

I want to battery-power my NodeMCU. It will be mostly deep sleeping and waking up every 1-2 minutes. I've seen the best way to power it with the least wasting of power is through a lithium battery. So ...
uzer123's user avatar
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1 vote
1 answer
5k views

I am trying to make a small project using Nodemcu. My project is WiFi controlled LED, 2 LED's will blink at the same time. I have successfully uploaded the code and it works fine using USB connection. ...
Vikranth N's user avatar
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0 votes
3 answers
9k views

Some sensors give as output a voltage between 0 and 5V. The analog inputs of the NodeMCU require voltages between 0 and 3.3V. I plan to make a voltage divider with two resistors like in this link for ...
user1420303's user avatar
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2 votes
2 answers
3k views

I am new to Arduino and electronics so please correct me if I made a mistake. Many sensors and actuators require 5V. The Lolin NodeMCU V3 has outputs of 3.3V. I want to have them working together. ...
user1420303's user avatar
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1 vote
0 answers
401 views

Sorry if this is something simple, but im scratching my head over this for a while and there are a few things that have me super confused. I have two WS2811 strips lighting up my outdoor stairs Both ...
Thomas PomTom Steel's user avatar
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-1 votes
3 answers
685 views

I have used hx711 and loadcell with nodemcu (esp8266) in its D1 and D2 pins ( here I have used Logic level shifter and a 5v supply to power hx711).It worked perfectly fine. Due to the lack of enough ...
noon masho's user avatar
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1 vote
0 answers
64 views

I connected EM18 rfid reader to NodeMCU to read rfid card data. It showed card number very quickly and consistently till it was connected to my PC's USB. But when I connected it to 5v power source (...
Kushagra Behere's user avatar
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9 votes
2 answers
20k views

Since I have no previous experience in electronics I'm getting quite confused while coming across these two terms ..I'd like to know whether they're the same or different.
User 1426833's user avatar
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-1 votes
1 answer
676 views

I am building a simple telnet style interface for experimental settings on my project. I am getting all the serial output sent to serial (and USB to PC). The code works fine, but if I try to read from ...
Tomas's user avatar
  • 338
2 votes
1 answer
5k views

I'm using a NodeMCU board to send commands to my home electricity switching box - using RS485 communication. For that, I've connected MAX485 TTL-to-RS485 converter module to my TX and RX pins. ...
Offer's user avatar
  • 107
2 votes
1 answer
1k views

I have this(Wifi Manager - Autoconnect IP) program run in my arduino IDE. And I get the output in serial monitor as this Can Anyone help me in displaying my SSID and PASS in this serial monitor ...
Josh Earnest's user avatar
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1 vote
2 answers
297 views

I'm currently working on an arduino project. Were the arduino is communicating with a NodeJS server via web sockets. The socket connection is working fine and has no problems. But the problem I ...
Jonathan Thunberg's user avatar
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1 vote
0 answers
72 views

I'm building a simple mobile controlled relay switch. however, I'm out of relay modules, but I do have these esp-01 relays: https://ae01.alicdn.com/kf/HTB1VIKLeJLO8KJjSZFxq6yGEVXaW.jpg I'm wondering ...
Sjoerd's user avatar
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1 vote
0 answers
532 views

I want to use two serial ports Serial1 - for debugging - No RX needed Serial - to read from a different device I receive garbled output instead of valid characters Here is code for NodeMCU #...
siddharth taunk's user avatar
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0 votes
2 answers
271 views

This is my first project with any sort of development board and it has been a blast so far. I am running into some issues, however, while trying to send serial data from my Uno to a NodeMCU board. ...
Lamar's user avatar
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1 vote
0 answers
292 views

I am Using Arduino IDE to program NODEMCU. I am expecting LED should remain ON for 4 sec. But it turns OFF in less than 2 sec. Please can anyone explain me why this happening? Also I noticed that if ...
Dattaraj's user avatar
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1 vote
0 answers
1k views

My project consists of NodeMCU controlling led from Firebase's RealTime Database (Using Esp8266Firebase library) The problem is that the delayed time is too long ( about 6 seconds from when I change ...
Thang Nguyen's user avatar
  • 23
-1 votes
2 answers
522 views

I wonder if a laptop USB port is enough or I have to use an external power supply if the NodeMCU under heavy load. Here is my list of sensors and port used. 3.3V 3.3V D1 to D7 A0 GND Sensors: ...
Thang Nguyen's user avatar
  • 23
-1 votes
1 answer
53 views

I want to execute a action only once when I press web page button but as the page tries refreshing the action gets executed in a loop. I am using the wifimanualwebserver example for esp8266. Please ...
Yash's user avatar
  • 1
0 votes
1 answer
700 views

I am trying to use a NodeMCU like an arduino,trying to read Temperature and Humidity using a DHT11,but when ever I check the serial monitor the it outputs : nan, Can anyone help me find the problem.(...
Akshay Raj's user avatar
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1 vote
2 answers
518 views

I connect my NodeMCU to Arduino Uno. The goal is to receive the whole string for example "12", every 1 sec. This is my code on Arduino Uno side ( the sender) int mock = 0; void setup() { Serial....
Thang Nguyen's user avatar
  • 23
1 vote
2 answers
108 views

Temperature drops occasionally from 59+C to -13C or to other random values. Used sketch and info from this site: http://internetofthinking.blogspot.com/2016/02/upload-ds18b20-temperature-sensor-data....
user60654's user avatar
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