Questions tagged [nodemcu]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
0answers
18 views

Problem feeding an ESP8266 and RGB 12V led strip from single source

I have an issue while was trying to feed an ESP8266 nodemcu v3 lolin and a RBG 12V led strip from the same source. When I try to use the same source, I am unable to access this ESP8266 webpage, as ...
0
votes
1answer
22 views

How would I trigger the flash button from a different button, or just trigger a different input via a button

I have a esp8266 nodeMCU Board I have the following schematic (or breadboard setup) I looked up my board and it says d3 is the flash button so I thought I could just hook up to it and my code would ...
0
votes
1answer
30 views

Sending multiple data between the two NodeMCU using Serial communication

I'm working on communicating between the two NodeMCU basing on the serial communication protocol. I've used SoftwareSerial and ArduinoJson library for my program according to some sources on the ...
0
votes
0answers
62 views

Turn Node MCU into a PLC which is integrated Lora module for IoT application

I've built a PLC that supports Lorawan and Modbus protocol using Node MCU. I managed to make it possible with Modbus by using OpenPLC. Everything worked well apart from its limitation in the distance ...
1
vote
0answers
26 views

PH 4502 electrical interference EMI when in aquarium

I'm trying to get a regular ph reading in an aquarium. The sensor works well when the probe is in a small quantity of water(i.e. a glass) but has large variations in larger water quantities (i.e. ...
0
votes
0answers
23 views

Serial Communication Arduino to NodeMcu

I'm looking to take inputs via keyboard by Arduino mega through USB cable (Serial monitor Inputs), and send them to nodemcu through serial communication (TX - RX ) so I can send it to a server (from ...
1
vote
1answer
17 views

Running NodeMCU ESP8266 on 3s 18650 battery pack powered by solar panel

I am making a circuit which controls a 12V analog mechanical device using microcontroller (NodeMCU ESP) GPIO. The Node MCU uses AMS 1117 to step down voltage to 5V (& another one to 3.3V), but ...
0
votes
0answers
32 views

Wrong Reading output bits of node MCU output in arduino

I am trying to read output on 3 pins of nodeMPU in my Arduino board. If value of all three pins are same then Arduino is reading wrong values. For example:- if pins have values 001, 010, 011, 100, ...
1
vote
0answers
39 views

External vs internal pull-up resistor

I'm using an esp8266 to read signals from a water meter. The meter periodically closes a switch between two wires. My prototype circuit works fine with either an external pull-up resistor, or using ...
0
votes
1answer
65 views

Is the ESP8266 able to collect 8 bytes data at 1 KHz for 1 second through I2C?

My project requires collecting data samples from an MPU6050 (i2c communication) at 1 KHz for 1 second, when the value exceeds a certain threshold. The data required are 3 axes acceleration data and ...
0
votes
1answer
38 views

My node mcu isnt turning on when connecting 3.3V to VIN [closed]

So I'm trying to wire my node MCU using in with 3.3V and in the multimeter, it's reading the 3.3V being delivered properly by the converter, I also tested for amperage and its consuming 37mA and I don'...
0
votes
3answers
53 views

Why is my fan circuit with SSRs short circuiting on power down?

I am attempting to build a "smart" ceiling fan for a home automation system I have created and added to over the years. However, this is the first time I've tried controlling a fan motor ...
1
vote
1answer
44 views

Calculating Yaw Pitch and Roll from Quaternions in MPU6050 without Gimback lock but giving problems

I am trying to convert quaternions provided by a MPU6050 to heading attitude and bank values but at least one of the three calculations is broken, for example in the third calculation (the uncommented ...
0
votes
0answers
21 views

NodeMCU + PIC16F877A IoT Project Problem

I've searched the internet for my specific use-case but had no solution. I have a circuit set up with PIC16F877A which perfectly displays a hard-coded text on a 16x2 LCD. But I want to change that ...
1
vote
1answer
39 views

Controlling Servo with MOSFET

I'm trying to understand how to drive a servo that needs 5V power with a 3.3V output microcontroller. If I have a 3.3V PWM signal and a 5 V power source, is there a way that I can use a single N-...
0
votes
1answer
31 views

Issue with my solar charger using LM2596

I am using a 20W solar panel, maximum voltage 21V & maximum current 1.23 A. I am using LM2596 to dtep-down to 5V to charge my powerbank, hich will later power my Nodemcu (ESP8266 board.) Issue in ...
1
vote
1answer
76 views

How to get constant 5v power supply when using same power supply for motors & micro controllers

I have made a wifi controlled car using nodemcu. It works fine if I connect nodemcu to a separate 5v supply. But if I use the same power supply for both the motors and nodemcu, it resets ...
0
votes
0answers
21 views

Library ESP8266 (NodeMCU LUA v2 Amica) for STM32F

I am looking for library (STM32_HAL) I can use in STM32CubeIDE for mentioned device based on ESP8266 (WiFi). I am trying to connect this with STMF410RB Nucleo Board. During my investigation The only ...
1
vote
1answer
83 views

Keeping NodeMCU operating with a super capacitor

Awhile back this post asked about providing 3-4 seconds of power to an NodeMCU subsequenst to a loss of its primary power supply. Prior Post I have a similar need except I only need a split second ...
0
votes
3answers
355 views

Emergency Backup Battery Supply

I am building a NodeMCU controlled 12v solenoid. I am hoping to add an emergency backup battery supply, but the emergency backup supply should not power anything but the solenoid. In other words, if ...
0
votes
0answers
20 views

How can i use nodemcu in sleep mode

I have a project that based on Iot.I mean human detection notification system using blynk. I want to implement it in home for security system. But nodemcu not work for a long time of period. But i ...
1
vote
1answer
27 views

Analog multiplexer or analog to digital converter to add analog inputs to NodeMCU?

I asked a question yesterday about the best analog multiplexer to use to add a few additional analog inputs to a NodeMCU. Someone recommended using an ADS1115 analog to digital converter. I am using ...
1
vote
2answers
478 views

Best MOSFET to control small 12v load with NodeMCU? [closed]

I am pretty familiar with Arduino, and I will be using a NodeMCU for an upcoming project I'm doing. I have never used a NodeMCU before. I am using it along with a few sensors to turn on and off some ...
0
votes
2answers
61 views

Transferring Circuit to Solderable Mini Breadboard [closed]

I have a simple wifi temp/humidity sensor I've set up on an adafruit breadboard, and I'd like to transfer to a perma-proto type board, but the solderable boards I have are a slightly different layout ...
0
votes
0answers
242 views

Integrate Tasmota with Nextion Display

I am designing a relay driver based on (D1 Mini) esp8266, and would like to use nextion 4832 touch displays. I am using Tasmota as the firmware for the same. I would like to use nextion touch display ...
0
votes
1answer
468 views

Is 26 AWG good enough for a ~1.5 amps current at 5V?

I have recently started to learn about electronics and as my first project, I'm trying to make a wifi-enabled LED strip. I have read a lot about all the theory, followed tutorials, and try to be ...
1
vote
0answers
41 views

How to blink LED using NodeMCU in Arduino IDE?

I have alredy installed ESP8266 package in my Arduino library. I connected d0 pin of NodeMCU to LED's positive terminal and ground pin of nodeMCU to LED's Negative terminal as well as I uploaded blink ...
0
votes
1answer
50 views

Can we use nodemcu in real-time projects [closed]

I have been working on some small iot projects using nodemcu. So I have an idea to make those nodemcu projects into real-time . The places like home, office, school
0
votes
1answer
41 views

Direct contact to infrared receiver from microcontroller

I have posted this question also on arduino forum but can't get more answers there. So basically I have an old DVD player that has an IR (infra red) receiver and I would like to automate it with a ...
0
votes
1answer
24 views

ESP8266 and I2C

I want to read data from five equal devices via I2C. Master is ESP8266 microcontroller and slaves are five MPU5060. The problem is that they have equal addresses. I've seen a lot of answers about how ...
0
votes
0answers
147 views

NODEMCU _ MCP23017 IO Port Expander Schematic Design

I am designing a relay driver using NodeMCU and need additional IO Ports, therefore I have designed a schematic utilizing MCP23017. I think the schematic looks good, however before I order PCB's based ...
0
votes
1answer
87 views

ESP8266 Getting Unstable with the following circuit

When the resistors in this circuit are removed, the NodeMCU is working absolutley fine, however when these are put, ESP gets unstable and the relays are flickering. Also unable to flash with these ...
1
vote
0answers
350 views

What is the recommended way to connect TP4056 charger module to NodeMCU v2

I want to power a NodeMCU v2 with a 3.7v 2000 mAh LiPo battery and charge the battery with the NodeMCU connected (i.e. under load). After looking into various forums, I ordered a TP4056 battery ...
1
vote
0answers
24 views

ESP8266-12E & BPM180 - Bad pressure retrieved

I have NodeMCU (esp8266-12E module) and connected BMP-180. I try to read pressure from BMP-180 in async web request, but it reads bad value. For testing purposes I log pressure in loop() - and it's ...
0
votes
0answers
159 views

NodeMCU-12E - Conflict between I2C and SPI

I have SPI SD-card module connected to nodeMCU, and it's worked well. Next I try to connect I2C sensor, and it doesn't work. Looks like SPI conflicts with I2C, because when I disconnect SD-card, I2C ...
0
votes
0answers
45 views

NodeMCU - Are all GND connctions born equal?

I'm designing a PCB which is based on NodeMCU board in its core. On NodeMCU there are some GND pins, most of them are to serve digital outputs/inputs, or external sensors which operate on 3.3V. Vin ...
0
votes
1answer
38 views

NodeMCU v.1 / WEMOS Mini - Fail to Wake up from deep sleep

I'm Trying to put to deepsleep a Wemos mini/ NodeMCU / ESP-01, and facing the same problem - fail to wake up. Looking around - I've found some articles such this ...
1
vote
1answer
260 views

HX711 module VCC and no VDD

(Image source and more details: circuitio.io) I am trying to build the above circuit powered by battery alone. Sparkfun HX711 is expensive and hence I am using HX711 bought on Amazon. Here is the ...
0
votes
1answer
189 views

Boosting current to trigger 3v relay

I should start off by saying that I'm really new to this electronics engineering thing and I really have no idea what I'm doing. I am working on building a display stand that turns some LEDs on/off ...
0
votes
1answer
68 views

door bell detector using NodeMCU

i modified my door bell with a NodeMCU which is now capable of triggering the door opener using a relay. Now I want to add a door bell detection to this system. I figured out two contacts which supply ...
1
vote
1answer
199 views

How to get right voltage output with Bts7960b H-Bridge?

I am using a NodeMCU to control a BTS7960b motor driver. (datasheet of the BTS7960) This driver controls a 12v dc motor. This image shows my wiring (without the display and the buttons and with a ...
0
votes
1answer
273 views

Controlling 12V water pump with NodeMCU – circuit design review

I'm a programmer who's recently become fascinated by electronics, specifically with microcontrollers and how I could use them for various IoT projects. For a starting pet project, I'm planning to ...
0
votes
1answer
65 views

NodeMCU GPIO pin interrupt [closed]

When using NodeMCU, I want to toggle the state of GPIO pin, using a physical switch. When the switch is pressed, the switch state should toggle from low to high, or high to low. I know I need to use ...
0
votes
0answers
28 views

How to connect five flex sensors to on esp8266?

I’m using a lolin nodemcu 8266. I was wondering if it is possible to connect 5 flex sensors to one node (to make a glove which detects finger gestures). I’m an experienced programmer but new to ...
0
votes
0answers
18 views

Problem setting registers (SPI) [NodeMCU fw, nRF24L01+]

I can read registers somewhat fine, but when I try writing to a register in the nRF24L01+, it either crashes and I have to pull it out of the board, or the register becomes all 0s, and I can't reset ...
0
votes
1answer
682 views

Interface NodeMCU with RCWL-0516 Microwave Radar Sensor and power via battery [closed]

I am trying to interface NodeMCU with RCWL-0516 Microwave Radar Sensor and power it via battery. Below is the circuit diagram Below is the Arduino Code I am using : ...
0
votes
3answers
498 views

Optocouplers vs Voltage Dividers

I have a device that has a terminal that goes to 5v at certain times. I wish to sense that voltage with an ESP32. I have built this circuit using an optocoupler: simulate this circuit – ...
0
votes
1answer
287 views

MOSFET voltage drop and LED flickering

I've build a LED strip controller using NodeMCU and a transistor STP16NF06FP according to the schematic below: LEDs were powered with 24 V power supply and I want to regulate it by changing the ...
1
vote
1answer
40 views

DHT22 doesn't transmit to NodeMCU V0.9

I am developing for the NodeMCU V0.9 with the NonOS SDK and can't get it to communicate to a DHT22 sensor. Wiring: 3.3V on NodeMCU -> + on DHT22, Ground to - and pin D1 to signal, there is a 6.8k ...