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Questions tagged [nodemcu]

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

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15 views

SIM900 GSM SHIELD with nodeMCU pins [closed]

Does anyone knows how to pin out nodeMCU/ESP8266 with SIM900
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0 votes
0 answers
27 views

ESP-32S NodeMCU - Unable to upload sketch

I was able to upload sketch to my ESP-32S, but now it don't work. I alway get Connecting........_____....._____....._____....._____....._____....._____....._____ A fatal error occurred: Failed to ...
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3 votes
1 answer
71 views

Ubuntu Serial Port Briefly showing on arduino IDE

I am using a NodeMcu with Arduino IDE on Ubuntu. I have managed to upload the blink script and it work. Now, when i plug the nodemcu, the serial port /dev/ttyUSB0 is briefly available in the IDE. ...
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0 votes
0 answers
31 views

How to capture the responses of GSM SIM800L whenever an AT command is sent?

I am using sim800L and nodemcu esp32-S. I would like to capture the "OK" or "ERROR" response of the sim800L whenever I try to send an SMS message using the sim800L and use it for ...
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  • 3
0 votes
1 answer
25 views

Node MCU Esp12-E does not support server accept function

I am trying to get a web server to run on the ESP12E on the Node MCU variant, and following the example from the esp8266 documentation page here. But the code does not compile, throwing the following ...
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0 votes
1 answer
39 views

NodeMCU programming without USB port

Recently, I've been attempting to build an anti-collision detection system for uses in a car. I bought several nodeMCU units and wil use one as a WiFi hub. In the course of experimenting, I broke off ...
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1 vote
0 answers
153 views

rst cause:2, boot mode:(3,6) caused by pointer reference

I am experiencing an unusual issue with my code. I have a LOLIN WEMOS D1 mini Lite and I am using the Arduino IDE to upload the sketch. The version of the board is 3.0.2 for ESP8266. The problem is ...
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1 vote
1 answer
46 views

MAX30100 and ESP8266 NodeMCU Serial Errors

This is my final year project and for some reason, the max30100 sensor defaults to static values once the HTTP post request has been performed. #include <ESP8266WiFi.h> #include <...
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1 vote
1 answer
62 views

esp8266 - server.handleClient() fails to call assigned function

I'm trying to get one esp to send integers to a second as a part of a simple remote control, but after multiple days I can't get it to work. The transmitter seems like it's connecting and sending ...
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1 vote
0 answers
98 views

Code uploading error on NodeMCU v3 "the selected serial port _ does not exist on your connected board"

when trying to upload code to NodeMCU v3, sometimes I get the error "the selected serial port _ does not exist on your connected board" and sometimes "timed out waiting for packet ...
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1 vote
0 answers
55 views

LILYGO TTGO T-Display cannot detect MPU 6050 Accelerometer, Gyroscope and Temperature Sensor

I've been trying to connect a MPU 6050 Accelerometer, Gyroscope and Temperature Sensor to a LILYGO TTGO T-Display to get readings displayed on the serial monitor (for starters). The wiring is pretty ...
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  • 73
1 vote
2 answers
143 views

Stabilize data from four gyros/accelerometer [closed]

I am currently working on a university project. My aim is to get a rough estimate of the posture of a person's back. For this I have built a system that collects the data from 4 MPU6050 at a central ...
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  • 121
1 vote
0 answers
41 views

When i upload the code to nodeMCU this error comes I have checked libraries ,ports made enviroment for nodemcu but error always come to screen

Arduino: 1.8.7 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled (new aborts on oom), Disabled, All SSL ciphers (most compatible), 32KB cache + 32KB IRAM (balanced), Use ...
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1 vote
1 answer
30 views

Selenoid motor not responding to NodeMCU instructions

I just start a project migrating from Arduino Uno to NodeMCU, basically this projects control some selenoid motors triggered by a website instructions. For example: if website returns 2, the motor #2 ...
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  • 13
2 votes
0 answers
90 views

How to fix this problem of invalid conversion from 'const char*' to 'char' [-fpermissive] [closed]

Im working with node mcu ESP 8266 and trying to make it a webserver but keep encountering this problem. #include<ESP8266WiFi.h> WiFiClient client; WiFiServer server(80); void ...
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1 vote
0 answers
197 views

Nodemcu Lolin v3 Timeout error

I am getting the Arduino console error "the selected serial port serial.serialutil.SerialTimeoutException: Write timeout does not exist or your board is not connected". I recently upgraded ...
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  • 21
1 vote
0 answers
155 views

ESP8266 NodeMCU Lolin V3 and using Firebase to update its software OTA

I want to update software OTA on multiple of my nodemcu devices that are currently sending data to my firebase database. I found this tutorial (https://medium.com/firebase-developers/over-the-air-...
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  • 21
1 vote
0 answers
605 views

How to connect Nodemcu ESP-32s and GSM SIM800L

The code that I use: #include <SoftwareSerial.h> //Create software serial object to communicate with SIM800L SoftwareSerial mySerial(16, 17); void setup() { //Begin serial communication ...
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1 vote
1 answer
76 views

Why does the send pin influence the receive pin with Arduino Capacitive Sensing Library

I'm trying to figure out how the Arduino Capacitive Sensing Library https://playground.arduino.cc/Main/CapacitiveSensor/ works. It says: When the send pin changes state, it will eventually change the ...
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-1 votes
1 answer
124 views

How to save sensor value in EEPROM? (ESP8266)?

I would like to save the height of a tank in case of power outage with EEPROM and every time I reboot the board. However, I could not do so after using EEPROM.commit() , EEPROM.get and EEPROM.put as ...
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0 votes
2 answers
309 views

How do I find out the maximum current through VIN on a NodeMCU board?

I read this answer https://arduino.stackexchange.com/a/51878 to a different, but related question. It seems like VIN on the NodeMCU is directly or via diode connected to the USB connector. Image ...
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0 votes
1 answer
101 views

NodeMCU with a 5V latching relay - LOW triggers relay

I am going to connect NodeMCU to a latching relay board like tis one (4 channel version): LINK Both MCU board and relay board will be powered from the same 5V voltage regulator. Now I have two ...
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  • 103
1 vote
0 answers
80 views

ESP8266 MCU not clearing memory?

I am still new at this. Using Arduino IDE My MCU was working as a web server with HTML code on SD card using the Webserver sketch. After trying to include other inputs it stopped working with "...
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  • 11
1 vote
1 answer
68 views

NodeMCU ESP32 as a replacement for my arduino project

I would just like to ask if this microcontroller can power or can manage 2 servos, 2 motors, and 2 hc-sr04 ultrasonic distance sensor combined? Also, does this board come with a bluetooth module?
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1 vote
1 answer
80 views

Unwanted Wi-Fi Jamming by ESP8266

I bought an ESP8266-01 module. I attempted to upload following code onto it. void setup() { // put your setup code here, to run once: Serial.begin(9600); } void loop() { // put your main code ...
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1 vote
1 answer
105 views

Why when I try to connect my ESP8266 to my node sever in my localhost it keep getting disconnect and connect?

I think the issue is within the library because I have try to implement this code according to the tutorial that I found in YouTube Youtube. The discussion of this tutorial is the first they implement ...
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0 votes
1 answer
64 views

Send Request With NODEMCU When A Key Press

Hi there I want to send a request to the server with get method with URL parameters, when a key is pressed with nodemcu. But I Can't Do This Work, I Got the Below Error From Serial Monitor: I Get This ...
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1 vote
1 answer
670 views

How to get current WiFi signal strength?

I have a LCD display where in I'm displaying a WiFi signal logo. I want to reduce the number of bars on the logo, indicating that the signal strength is dropping. I got the reducing bars on the LCD ...
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  • 452
0 votes
1 answer
109 views

does EEPROM reset itself when a new code is uploaded?

I have a Nodemcu with which i'm doing a project. So whenever there is a power loss i want values of some of the variables to not be reset, because of that im trying to store the values in EEPROM of ...
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0 votes
1 answer
50 views

How to program and arduino UNO via NodeMCU ESP8266?

I don't have my USB type A cable to program my UNO, I would like to program it via a NodeMCU ESP8266. Maybe with the TX and Rx pins, I've seen people program certain versions of ESP with a UNO board. ...
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  • 452
0 votes
2 answers
188 views

2 way switch with Arduino?

Hey I'm working on a home automation system where I can replace one of my 2 way switches to an Arduino Or node MCU controlled one but I want to avoid normal relays because as of what I know they can ...
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2 votes
1 answer
125 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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  • 452
1 vote
0 answers
73 views

Inconsistent values from NTP client

Hardware- ESP8266 Based NodeMCU I am using NTP Client for time in my alarm project. I am facing an issue where NTP client is not returning proper values, in the sense that it works properly for the ...
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  • 452
1 vote
0 answers
103 views

Prevent flicker - Lcd with I2C module?

I have a 16x2 LCD with a I2C interface, and a Esp8266 based NodeMCU. I Have an issue where the second line of the LCD is flickering, but somehow the first line does not flicker. Why does this happen ...
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  • 452
1 vote
1 answer
523 views

Why is this extremely simple code not working?

I have a problem with a for loop, and Serial.print("Its Working") does not appear. Seems simple, I've done it before, now for whatever reason, its not working anymore void setup() { // put ...
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  • 452
1 vote
0 answers
253 views

Multiple MQTT topics

I have 3 nodemcu's(ESP32) each connected with a sensor, from which I get data and send it to aws IoT-core. How can I send all 3 sensor's data by a single MQTT subscription? The below code is for a ...
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0 votes
1 answer
78 views

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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0 votes
1 answer
291 views

Decode rf remote signals with ESP32 or node MCU?

I'm trying to decide my rf remote signals using ESP32 or node MCU. I have tried with Arduino and was successful but for some reason it is not working on either ESP32 or node MCU even using the same ...
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1 vote
1 answer
248 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
1 vote
0 answers
80 views

NodeMCU server stops responding after a while

I'm new to NodeMCU and ESP. I've created a basic web server on my NodeMCU. The server works fine for the first few minutes after resetting the board or re-uploading code. But after about half an hour, ...
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3 votes
0 answers
67 views

ESP8266 requires two resets to wake up from deep sleep [duplicate]

I'm working with the following circuit using a NodeMCU: I have the solder jumper bridged between RST and BTN. In addition to what's in the schematic, pins 2, 3, and 4 of J1 are connected to the ...
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1 vote
1 answer
3k views

ESP32S v1.1 NodeMcu vs ESP32 DevKitV1

I have two different ESP32 development boards labelled "ESP32S v1.1 NODEMCU" (A) and "ESP32 DEVKITV1" (B). From what I can tell they have the same major components, but their pins ...
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  • 111
2 votes
0 answers
76 views

ESP8266 + 4x TM1637 == possible?

I'm having trouble getting my NodeMCU connected to 4 x 4 Digit 7 Segment Displays. So far I've been able to connect 2 & get them to display things from the demo repository. However, after trying ...
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  • 121
1 vote
0 answers
60 views

L298N Motor Driver not working

I am using a L298N motor driver to connect a motor with NodeMCU. But i did a few tests since a few tests while learning how to control it now when i connect it the motor doesn't even work. Then i ...
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1 vote
1 answer
83 views

NodeMCU and relay with VIN power

Have read a lot of different things online, and I just ain't sure yet. I'm trying to hook up a NodeMCU to control some relays. And want to power the NodeMCU by the VIN pin. Anyone know if this setup ...
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  • 13
0 votes
2 answers
125 views

Why echo "R" > /dev/ttyUSB0 doesn't work, but on the same PC Serial Monitor in Arduino IDE works?

I have a strange problem. I am running Ubuntu and NodeMCU si plugged into USB. I have very simple sketch running on it, when it reads letter "R" on serial, it turns ON relay. When I open ...
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  • 127
1 vote
0 answers
91 views

nodemcu POST request over https return error code -1

I have a nodejs application deployed and have been trying to send data to the api using the following sketch on my nodemcu: #include <ESP8266HTTPClient.h> #include <ESP8266WiFi.h> void ...
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  • 111
1 vote
0 answers
133 views

Debouncing interrupt using capacitor

I'm currently working on nodeMCU and need to use interrupt pin. I find out there are bouncing problem when using interrupt thus i use capacitor 100uF to solve this problem. The question is by using ...
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1 vote
0 answers
87 views

How can I use GPIO pins on an esp12e UART?

I've bought an esp12e UART that unfortunately had some issues, but I was able to fix them. This is how I connected it to the arduino. With this setup, I was able to host a simple web server and it ...
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0 votes
1 answer
95 views

NodeMCU and SDS011

today I connected the SDS011 to NodeMCU. I noticed that this only works when the sensor is connected to the voltage VU. If I connect the sensor to another pin for the voltage, it does not respond. Why ...
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