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

I need to Get my changed SSID and Password in my Serial monitor

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 ...
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1answer
30 views

Receive socket when in loop arduino (Interupt a while loop with a socket)

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 ...
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20 views

Use esp-01 relay with Nodemcu possible?

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 ...
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15 views

ESP8266 - Garbled output when using serial Swap

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 #...
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2answers
57 views

Uno to NodeMCU Serial Connection Problem

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. ...
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28 views

ESP8266 Loop cycle frequency gets decreased after WiFi got disabled

In a traditional scenario, after the setup() method we go to the loop() method of our sketch. You know, usually it gets executed probably 5-10 times in a second (or even more). I am now playing ...
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21 views

Problem with NodeMcu interrupt

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 ...
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26 views

(Firebase and NodeMCU) How to reduce the delay time when control led?

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 ...
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2answers
33 views

Can I use laptop USB port to power Nodemcu if every port used

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: ...
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12 views

nodemcu nack error bh1750

I am trying to run a simple example of bh1750 on my nodemcu, code is #include <Wire.h> #include <BH1750.h> */ BH1750 lightMeter(0x23); void setup(){ Serial.begin(9600); Wire.begin(...
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20 views

command keeps echoing because web page tries refreshing

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 ...
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1answer
40 views

Unable to use DHT11 with NodeMCU(esp8266)

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.(...
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40 views

Need sugestion to improve my arduino sketch

I want my code to blynk friendly by avoiding while condition in loop or flood error as mention by blynk. But , i m unable to do so.whenever i try to call function outside loop , it get stuck in first ...
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21 views

how this problem can resolve? i am using esp8266 node mcu [duplicate]

Uploading 295424 bytes from C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_281128/dustbin-local-http.ino.bin to flash at 0x00000000 warning: espcomm_send_command: didn't receive command response ...
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2answers
55 views

Receive whole string in serial sending data?

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....
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2answers
23 views

Temperature anomaly on BS18B20 + NodeMCU on Tingspeak

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....
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23 views

Nodemcu & GSM module & CLIP problem (CLIP line not always appears on the serial connection)

I'm working on phone-controlled car park gate. Trusted employees numbers are saved on SIM card/hard coded in program. So the idea is, if a trusted person calls the "gate number" ; Nodemcu will ...
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1answer
38 views

ESP12E motorshield analogWrite issue when powering DC motor

I am relatively new to adruino and this whole space. I am currently trying to power a DC motor using an ESP12E motor shield and an ESP8266 Module Motor Shield - https://www.amazon.com/gp/product/...
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20 views

Not able to interface BME280 with Nodemcu v3

I am not able to read bme280 sensor values and have tried many codes online. Please have a look below- code:- #include <Wire.h> #include <Adafruit_Sensor.h> #include <Adafruit_BME280....
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22 views

WS2812B not fully working with NodeMCUv2 [ESP8266]

I have a problem with my NodeMCU v2 board and my WS2812B led matrix with 256 (32x8) LEDs. The Board cannot be able to turn on the 191th led and stops working after the 190th without changing the ...
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2answers
37 views

SoftwareSerial interfers with TVout

I'm using an Arduino uno and a Nodemcu for making a game with the phone as a WiFi controller. The Nodemcu is the server that receives inputs from the phone connected via WiFi and sends to the Arduino ...
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26 views

NodeMcu does not connect to my wifi

this is the code , and it never connects to the wifi ,i dont know what to do , the code is an example in the blynk library
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1answer
72 views

Error when compiling code NODE MCU ESP8266-12E module in Arduino ide

Here is my sketch: #include<ESP8266WiFi.h> char* ssid = "xxxxxxxx"; char* pass = "xxxxxxx"; void setup() { WiFi.begin(ssid,pass); Serial.begin(9600); while(WiFi.status()!=WL_CONNECTED) { ...
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74 views

Relay board not working with nodemcu

This is the relay board I am using nodemcu to make a home automation project which is controlled by google assistant. This is the code i am using is this one #include <ESP8266WiFi.h> #include "...
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37 views

Arduino How to Concat Strings

am stuck with something simple which is concating string not sure what am doing wrong , am getting exception (3 ) error due to it 3 LoadStoreErrorCause Processor internal physical address or data ...
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2answers
135 views

Nodemcu is connected to 5v relay with logic converter but still not working

I am using a bi-directional 3.3-5V logic converter to control 5V relay with 3.3V D5 pin of nodemcu. link of logic converter is here However, I expected to control the relay but it didn't work. I don'...
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22 views

NodeMCU current consumption in all modes

I am using NodeMCU for my project.I wanted to know how much current it takes in its all modes like sleep mode,deep sleep mode and also in its wifi modes like station and access point mode. Thanks in ...
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28 views

HX711 with NodeMcu

I am trying to make a scale that measuring weight. In internet i did some researches so i got some questions. I have this module as a HX711 And square 3 wired loadcells( Red,White,Black Wired). My ...
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14 views

3 wired loadcell with HX711 Arduino Uno, Nodemcu

I am trying interact with a loadcell that is 3 wired. I am using arduino uno or nodemcu adafruit huzzah and sparkfund hx711 module.But i cant take scales. I only getting 0.0 grams and when i applied ...
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1answer
39 views

NodeMCU max draw

1) what is the max draw I can draw from NodeMCU V3 logic and 5v pins? 2) Also, I heard i draw with it more than 500mA, the PC USB port stops working. Is that information actual? Because USB 3 port has ...
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40 views

nodemcu GPIO6 clock

is there a way that i can declare gpio6 (CLK) as an input without getting a wdt reset? I'm somewhat new to circuitry, but my boss wants to use it(GPIO6) to talk with external devices. I have more ...
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1answer
40 views

MQTT with OLED realy :- display not coming properly

I am very new to Arduino/ESP and I am writing a code to activate 2 relays using MQTT. Also like to display status on OLED here is my code #include <ESP8266WiFi.h> #include <ESP8266WebServer....
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106 views

How to get current Date [closed]

How to get Current date, month and year. I have used RTC, NTPClient, but it didn't work. This gives default output of 1970. What can I do for fixing it. time_t now = time(nullptr); struct tm* newtime ...
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1answer
37 views

NodeMCU MQTT getting topic but not calling IF loop

I am very new to Arduino/ESP and I am writing a code to activate 2 relays using MQTT. My connection is successful and I am able to receive message/topic printed out on serial console. Here is my code: ...
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126 views

Programming OMRON - D6T MEMS Thermal Sensor with NodeMCU

Hi I need some help here, I'm currently doing a school project that requires us to replace Arduino Uno to NodeMCU, I understand the hardware pin configuration is different, and I also found a code ...
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45 views

Connect NODEMCU with SIM800L

How should I connect nodemcu with sim800l? Will the code be similar to the one used for interfacing sim800l with arduino uno? I tried to use the GPIO pins 1 and 3. #include <SoftwareSerial.h> ...
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48 views

Nodemcu single server with 2 clients

I am trying to connect my nodemcu server with 2 nodemcu clients. One client is connected and it works perfectly. I am unable to configure what to do for the other client to be connected and share data ...
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3answers
53 views

How can one reset Arduino Nano from NodeMCU?

If one connects the RESET pin on an Arduino Nano to a digital pin on a NodeMCU, will the NodeMCU be able to reset the Nano by setting said pin to LOW?
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49 views

Do comments occupy space in compiled C++ sketch? Arduino / NodeMCU

I tend to leave old code around as comments until I am sure that my current version is stable. Just the way I like working. I am concerned that I may be unnecessarily bloating up my sketches. Do ...
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1answer
24 views

Communication between three NodeMCUs such that one in in AP mode, second one in AP+STA mode and the third NodeMCU in STA mode

I am able to establish a connection between first and second NodeMCU, but unable to do so for the third nodeMCU. I used the IP address to establish connection. Should I assign a different IP to each ...
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1answer
97 views

Nodemcu Server with multiple sensors

I am trying to connect my nodemcu client with nodemcu server, while my client is connected with two sensors (DHT11 and Soil Moisture) and it is workign perfectly, but on the server side I am unable to ...
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1answer
123 views

Soft wdt reset error on NodeMCU (ESP8266)

I am getting error on Serial monitor Soft WDT reset. I decoded the error code also and found the following stacktrace. I am using SIM808 module and DFRobot_sim808 as the library. 0x4010030d: ...
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76 views

ESP8266 do not 'reset' when I connected D0-RST for deepSleep

I connected like this status(D0 ~ RST) on my ESP8266 NODEMCU board for making deepSleep & wakeup automatically. after I set like this, ESP.deepSleep(5e6); // 5second for entering deepSleep mode ...
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31 views

How to make watchdog and automatically reset on esp8266

When my system is confronting at logical & hardwaretical problem, I want to make system know It has some problem and reset automatically because my esp8266(nodeMCU) is on the place where people ...
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19 views

Nodemcu POST Response “-1”

Nodemcu device is returning HTTP response -1 for a POST request on django rest api. I tried the below http request to Postman, and it works perfectly fine. http://localhost:8000/api/datalogs/?plant=...
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1answer
45 views

Communicate between 3 nodeMCU

How should I verify the communication between three node MCUs where one behaves as server and the other two as clients such that data of each node mcu is obtained on all three?
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30 views

NodeMCU v2 - Current when powering from VIN

I am working on a project and I want to directly power my NodeMCU from VIN. I have found lots of articles and questions talking about different voltages on the VIN pin of the NodeMCU, but almost none ...
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598 views

WebSocketsServer.h: No such file or directory

I'm trying use the NodeMCU WebSocket. I downloaded the required libraries from: https://github.com/Links2004/arduinoWebSockets and pasted them in my Arduino libraries folder. I uploaded my code but ...
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1answer
24 views

External power supply to 4 channel 5 volt relay

i am from india. I have a question. can i power up a 5 volt 4 channel relay module with a 5 volt 0.7-0.8 mAh wall type charger, which is basically use for charge the simple mobiles. If yes, then how i ...
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22 views

Adafruit MQTT Library Error Connection failed

Adafruit_MQTT library is awesome but i have got a problem with it. I use it in Arduino with NodeMCU (ESP8266). Everything is okey with example code. (TLS connection - WiFiClientSecure). With my way ...