Questions tagged [nodemcu]

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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 ...
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6 views

Node mcu , D1,mini and alexa integration issue

I am being watching too many vdo of making a smart switch using esp8266 and 4 channel relay. Tried many sketches with fauxmoesp, uploaded hundreds of time successfully in di mini as well as node mcu ...
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1answer
26 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-...
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1answer
24 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 ...
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1answer
67 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 ...
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13 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 ...
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1answer
58 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 ...
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3answers
282 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 ...
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18 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 ...
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1answer
26 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 ...
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2answers
387 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 ...
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2answers
60 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 ...
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110 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 ...
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1answer
138 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 ...
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37 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 ...
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1answer
39 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
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1answer
38 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 ...
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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 ...
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50 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 ...
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1answer
82 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 ...
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181 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 ...
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23 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 ...
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94 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 ...
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29 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 ...
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1answer
35 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 ...
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1answer
180 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 ...
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1answer
157 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 ...
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1answer
60 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 ...
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1answer
150 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 ...
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1answer
165 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 ...
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1answer
51 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 ...
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26 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 ...
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16 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 ...
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1answer
476 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 : ...
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3answers
349 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 – ...
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1answer
191 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 ...
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20 views

Same software on single ESP-12f slower than on NodeMCU

I have programmed a small software to control an LED strip using an esp. I've written a web app which sends a request to the esp which then applies the color. So far everything works, but I've got a ...
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1answer
37 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 ...
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1answer
525 views

NodeMCU ESP8266 DHT22 reading nan (2147483647)

I am new to electronics and microcontrollers and hope this is the right spot on StackExchange. I have been playing around with an Arduino Micro, connecting different sensors and a display and display ...
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7answers
1k views

Trying to get (more) accurate readings from thermistor (electronics, math, and code inside)

So I'm trying to get accurate temperature readings off this TDK B57164K472J thermistor... It's connected in series with a 1 K resistor, and connected to an ESP8266's onboard ADC. The thermistor has ...
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1answer
422 views

Resetting of NodeMCU ESP8266 in deep sleep

I have been doing a project as my first project to learn ESP8266 applications. My project is a temperature and humidity values data logger and upload the data to Thingspeak. The sensor used is DHT11. ...
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1answer
167 views
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1answer
152 views

TP4056 doesn't work without power source connected [closed]

I have a problem with my TP4056 circuit. My goal is to (solar)power a NodeMCU V3 with the TP4056. I simply connected the output from the TP4056 to VIN and GND from the NodeMCU board The TP4056 ...
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2answers
1k views

Drive 12V Automotive Relay from 3.3v ESP32

I am working on a project to start a vehicle using Automotive Relays. And I am following this circuit in the tutorial to do so. Everything works fine on Arduino UNO. But I want to use ESP32 of this ...
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46 views

Prevent spurious triggering of NodeMCU GPIOs

I designed a simple circuit to control a relay with a NodeMCU micro controller. The NodeMCU polls a remote web service via a simple API and pulls high or low the D1 GPIO according to what it's posted ...
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2answers
527 views

Remove Esp8266 from NodeMCU board

I want a simple programming jig for the Esp8266, Sadly, all of the jigs I can find on ebay and other sites, have not worked for me, and use the Silicon Labs CP210x, and I have had NO luck at all with ...
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1answer
836 views

Driving IR led from 3.3V GPIO using 2N2222 transistor

I am using the following circuit to drive an IR led from a NodeMCU. simulate this circuit – Schematic created using CircuitLab However, im seeing the following on my scope. (Please ignore the ...
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0answers
46 views

Which pins need to be free to flash NodeMCU via USB

It is not completely clear to me, which pins need to be free (disconnected from other components) in order to flash the NodeMCU via USB with a firmware. Of course, this depends on the connected ...
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35 views

NodeMCU with JHD162A Lcd module display issue

I have uploaded a program to NodeMCU, to print "hello, world" on JHD162A 16x2 LCD module. But the text doesn't appear on the LCD display. Instead just black blocks appear on the first row on the LCD. ...
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1answer
432 views

NodeMCU 12E: Using 8 Digital pins 8 Channel Relay

I am trying to connect my 8 Channel Relay to my NodeMCU 12E and use it for automation with Alexa. For digital output I am using the ports: D0,D1,D2,D4,D5,D6,D7,D8 And for power: Relay(VCC) -> ...