Questions tagged [nodemcu]

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

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21 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
41 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
26 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
42 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
49 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
26 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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0answers
20 views

NodeMcu 1.0 keeps resetting automatically after random time [duplicate]

I want to show some digits in a 3x3 p10 red led panel 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
43 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. ...
3
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1answer
53 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
41 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
19 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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41 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
25 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
42 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
39 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
51 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
79 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
81 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
26 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
39 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
52 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 ...
1
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1answer
34 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
28 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
44 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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1answer
45 views

How to push two values to the same key from Arduino to Firebase

I would like to push two values at the same time (to the same node) from arduino to firebase. I tried to create an array and push the array to firebase, however, that is not working. Here are the two ...
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1answer
36 views

Is Arduino Mega Hackable Over The Air

After reviewing similar topics I've decided to ask this question below in the Security Stackexchange forum about 11 days ago. https://security.stackexchange.com/questions/235423/is-arduino-mega-...
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1answer
35 views

wdt reset cause:4, boot mode:(3,6)

I'm working on Python and nodeMCU with websocket connection. So, I send a string from Python to nodeMCU and nodeMCU collects the string and decodes to set values to a stepper motor. Initial code ...
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0answers
35 views

Relay with NodeMCU is not working

I'm using a Relay Channel and NodeMCU(8266-WIFI). When i trigger the connection, LED Turns ON in Node MCU But the Relay connection is not working. I'm not sure what is the issue, Please help to fix it....
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0answers
22 views

Arduino Uno + NodeMCU serial to MQTT

I made a pool monitor with ORP + pH + temp sensor. I had everything working (apart from ORP sensor causing interference with pH sensor, but that is a different topic...) for the past couple days in a ...
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0answers
64 views

Two way serial communication between arduino mega and NodeMCU

I'm trying to create an IoT device that will collect data from the sensors and display them in a mobile app, also let the user control the device using the mobile app. So I need to set up two-way ...
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1answer
50 views

MPU6050 Problem with NodeMCU

I am using MPU6050 as a part of IMU of my drone, and I wrote this program for Arduino Nano to fetch the orientation of the MPU6050 module in 3D space. And that works perfectly fine, but when I ...
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1answer
30 views

NodeMCU ESP8266

I am doing a project and using NodeMCU ESP8266. My project includes sensors for UART, I2C and 4 interrupts. I need to read the data from these sensors and get these data via microUSB in real time. ...
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1answer
44 views

Fastest Communication from NodeMCU to Arduino Nano

For one of my projects, I need to transmit data from NodeMCU to my Arduino Nano, in real time, I used S-Bus, but it quite unsatisfies me, as, slight latency is taking place. I am transmitting a JSON ...
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1answer
20 views

How to wire L293D chip to a nodeMCU?

How do I wire an L293D motor controller chip to a nodeMCU? I have tried to follow the instructions from this tutorial: lastminuteengineers.com One problem. I don't have a 5v pin? Are there any ...
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2answers
155 views

Nodemcu v3 - Power supply via VU pin?

I want to control two hitec hs55 micro servos via a Nodemcu v3. These need at least 4.8 V power supply acc to data sheet. Specs: Hs-55 micro servo: Voltage range: 4.8-6 V Current Drain - no-load (4.8V)...
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1answer
40 views

Latency in Websocket

I am using Websocket, for a communication from my mobile phone to a NodeMCU, and transmitting 4 channel, data, through 4 different Websocket Ports. the NodeMCU control code is here: // ============ By ...
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41 views

I2C LCD displaying gibberish

I have connected a I2C LCD with my NodeMCU v3. My pin configuration is as follows: Node MCU ---> I2C LCD GND GND 3V VIN SDA D2 SCL D1 I have been testing a ...
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1answer
46 views

ESP8266 NodeMCU 3v3 current for fingerprint sensor

From what i see that 3.3Vpin provide 3.3V and 400mA. The fingerprint module i use is AS608. Connecting the fingerprint module power pin to 3.3V of the nodemcu. From the datasheet it only can handle 3....
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1answer
21 views

Node MCU Wifi connection problem

I'm trying to connect my nodeMCU to my WiFi network also i have provided ip address but it keeps printing ........ it is not connecting to the network. Below is my code. #include <ESP8266WiFi.h>...
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0answers
50 views

Is it possible to access GPIO9 and GPIO10 as DIO?

I have a nodemcu dev board with the esp12 chip. (Not the esp12e one). I have tried to make use of gpios 9 & 10 for digital output. On the board, they are marked as SD2 & SD3. I suppose they ...
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0answers
123 views

Sending AT commands to Reyax RYLR890 LoRa modules via additional serial port not working

I am setting up a LoRa module (transmitter) with nodemcu (ESP8266). The module (Reyax RYLR896) accepts AT commands over serial interface. I created an additional serial port using pins D7 and D8 on ...
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0answers
36 views

NodeMCU LUA ESP8266 12E Issues with Programming

I recently bought the NodeMCU ESP8266 to work on an embedded project, and for whatever reason, the board will only allow me to upload Arduino sketches when I unplug and replug in the board via the ...
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0answers
71 views

ESP8266 NODEMCU V3 web server with MAX7219 and DS3231 RTC

I am using ESP8266 NodeMCU with MAX7219 and a DS3231 teal time clock. I want to display the time and some text. The display is made of 4 FC16 modules which are made of 4 8x8 MAX7219 led matrix modules ...
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1answer
61 views

NodeMCU wiring for Serial1?

I'm trying to get telemetry data to be sent out Serial1 on the NodeMCU board. I read that TX is (by default) mapped to pin D4. Ultimately, there will be a Raspberry that will be listening for ...
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1answer
123 views

Running hardware interrupt function on NodeMCU ESP8266, Exception(0) after four iterations, can't disarm interupt function

I've been trying to test the stability and consistency of hardware interrupts on my NodeMCU ESP8266. I'm using the Arduino IDE. This sketch should not require any external circuitry and I think, but ...
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0answers
44 views

NodeMCU EEPROM Stored Datas Deleted Suddenly

In my project i am using nodemcu board.It is clone of Adafruit's huzzah. Last days i faced a problem about eeprom. 1- I have some data and i have to save this datas on eeprom. 2- Data types are ...
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1answer
58 views

NodeMCU Power supply

I got a question about externally powering my NodeMCU V3. It has an onboard voltage regulator (3v3) which breaks out to 3 header pins. Now I want to power 3v3 from an external board. Can I supply 3v3 ...
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1answer
142 views

Why do ESP boards break out the SPI flash pins?

I have an ESP32 development board and a NodeMCU board here. Both breaking out the pins for the SPI flash of the ESP. These pins are mentioned in standard pinout descriptions as must/should not connect....
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0answers
44 views

Blink doesn't work on pin D3,D4 and D0 but works on D7

I am facing a strange issue. I am trying to blink an external LED using Wemos D1 mini V2 board. But it is not working. My sketch is as below. int LED = D3; void setup() { pinMode(LED, OUTPUT); } ...
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43 views

How can i send data to phpmyadmin database? using esp8266 nodemcu and max30100

i want to send data from my sensor to database phpmyadmin. but i only get zero values. please help me thank you. void loop() { pox.update(); BPM = pox.getHeartRate(); SpO2 = pox.getSpO2(); // ...

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