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Questions tagged [nodemcu]

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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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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 ...
rohithrathod banoth's user avatar
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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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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 ...
Coder9390's user avatar
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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 ...
Coder9390's user avatar
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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 ...
Coder9390's user avatar
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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 ...
Shridatha Hegde's user avatar
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158 views

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 ...
rohithrathod banoth's user avatar
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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 ...
rohithrathod banoth's user avatar
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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 ...
Coder9390's user avatar
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214 views

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, ...
Muhammed Gül's user avatar
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76 views

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 ...
Florian Ragwitz's user avatar
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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 ...
Dave New's user avatar
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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 ...
Big_Bird's user avatar
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154 views

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 ...
vasantha raj's user avatar
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1 answer
329 views

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 ...
John's user avatar
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654 views

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 ...
Frodik's user avatar
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510 views

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 ...
Amin Baig's user avatar
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495 views

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 ...
Albert H M's user avatar
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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 ...
dcadarko's user avatar
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1 answer
337 views

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 ...
TrompetenTom's user avatar
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86 views

I am using a nodemcu and running a code using hall effect sensor and ultrasonic sensor with deep sleep except the deep sleep keeps hanging when I use this code. With code taken from online it does not ...
dachu darshan's user avatar
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1 answer
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I have a node MCU and it hangs when I used a deep sleep, as shown in the image attached. My code looks like this: /* * ESP8266 Deep sleep mode example * Rui Santos * Complete Project Details https:...
dachu darshan's user avatar
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Hi my USB to UART bridge (CP2102) seems to be broken on one of my NodeMCU Dev Boards with ESP8266. It seems to be just that specific board since all other boards that I have can be flashed without ...
shyney's user avatar
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1 answer
120 views

The project I'm planning is to use a NodeMCU at each electrical board in house to control lights and fans via relays. Each MCU will communicate via MQTT over WiFi to a Raspberry Pi 4 from where I can ...
coldbreeze16's user avatar
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2 answers
471 views

I'm trying to connect paj7620 to nodemcu micro-controller. I have implemented the following code and it worked perfect on arduino uno. The problem is that I was made to migrate to nodemcu. Here is my ...
Mostafa Ghadimi's user avatar
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I'm using ESP8266WiFiMulti, ESP8266WebServer and ArduinoOTA to communicate with my device and perform over-the-air-updates. Everything was working perfectly until I moved the ESP8266 further from the ...
DV82XL's user avatar
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i am using NodeMCU (ESP8266) to communicate with another NodeMCU (ESP8266) using Serial Communication. Because i am using ESP-NOW to communicate and ESP-NOW and WiFi can not work together very well so ...
user3201500's user avatar
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1 answer
74 views

I have a project that records interrupts from a reed switch to nodemcu. It records like this: 0.3,0.6,0.9,1.2 Then what I want to happen is to go back to zero when it successfully HTTP.POST to a ...
Giddsec's user avatar
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1 answer
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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 ...
rohithrathod banoth's user avatar
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2 answers
1k views

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 ...
rohithrathod banoth's user avatar
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0 votes
1 answer
784 views

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 ...
Rishabh's user avatar
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1 vote
0 answers
1k views

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 ...
K20GH's user avatar
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2 votes
1 answer
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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 ...
blackbug's user avatar
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2 votes
0 answers
3k views

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> ...
user71373's user avatar
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1 vote
0 answers
2k views

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 ...
Talal zahid's user avatar
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1 vote
0 answers
162 views

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 ...
Kenny0770's user avatar
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1 vote
0 answers
102 views

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 ...
Prashant Sharma's user avatar
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0 votes
1 answer
233 views

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 ...
Shakir's user avatar
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3 votes
2 answers
1k views

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 ...
Snefru Clone's user avatar
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1 vote
2 answers
121 views

I have a filter coffee machine that looks like this one and I would like to send a message to the machine users by using any development board (like Arduino or NodeMcu) when the machine is finished. I ...
SayMyName's user avatar
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2 votes
0 answers
869 views

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 ...
Anandu v t's user avatar
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1 vote
1 answer
538 views

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 ...
Nishant Srivastava's user avatar
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0 votes
3 answers
5k views

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 ...
Gabriel G.'s user avatar
  • 111
2 votes
2 answers
1k views

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 ...
bhenriksson's user avatar
  • 21
3 votes
1 answer
1k views

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 ...
Shubham Bajaj's user avatar
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0 votes
0 answers
755 views

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, ...
Edelweis Dwi K. Dewi's user avatar
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2 votes
2 answers
415 views

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 ...
Marcelo_M's user avatar
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1 vote
0 answers
350 views

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. ...
Wayne 254's user avatar
  • 33
3 votes
1 answer
1k views

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 ...
tal itshak's user avatar
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1 vote
0 answers
38 views

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 ...
Marcelo_M's user avatar
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