Questions tagged [nodemcu]

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ESP-12F and Nextion 4832 UART work at diff voltage levels

I have a D1 Mini and a Nextion 4832 display, both are powered by 5V, however, we know that D1 mini contains an LDO which steps down the 5V to 3.3V for ESP8266, However, the Nextion Display operates at ...
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1answer
47 views

MOSFET N loss power battery calculation

I have a circuit to calculate my battery level using NodeMCU. I use this formula: ...
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0answers
35 views

Adding momentary switch (push-button) to NodeMCU

I want to add 2-pole momentary push-button (switch) for my covers. Integration goes through a NodeMCU and ESPHome. I'm having a hard time understanding the schematics for this switch: I'm not sure ...
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20 views

NodeMCU/ESP8266 to drive pulse sensor?

I have a Daikin BRP069A61, which is a heatpump accessory that allows the heatpump te smartgrid controlled. In simple terms: It will turn on when PV-power is available and will limit power to whatever ...
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1answer
96 views

Stepper motor driver TMC2209 is powered from microcontroller logic pins

I am doing my first steps with a TMC2209 V1.2 stepper motor driver and a NodeMCU. This is my circuit: I power the motor side via 12 V supply (12 V on the lower rails). In the circuit, this is ...
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2answers
73 views

Dual Power Supply for single 10m LED Strip Run

This is my first time here so sorry for any wrong formatting. I am currently creating a project where I will run my wall with 10 meters of addressable LED strip (Made up of 2 x 5 meters rolls). I have ...
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12 views

ESP8266 fails to work when connected to sdcard reader

I have a simple blink LED program running on the ESP8266: ...
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1answer
41 views

How to know the status of a two way switch through MCU

My project is this one that I asked earlier (except the fact that I'll be using SPDT switches) Two way lighting What I'm asking can the MCU detect if the circuit is closed (whether by the physical ...
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1answer
56 views

Pull 5V using NodeMCU output pins

This diagram is of the little device to read the data from P1 port on the DSMR electric meter. In my case it is Landis E360. RTS and 5V pins are shorted in the diagram and that is to trigger the data ...
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45 views

Cannot flash Wemos D1 using NodeMCU

I am trying to flash Wemos D1 mini (ESP8266) using NodeMCU according to this video. Pins NodeMCU → Wemos: RX → RX TX → TX D3 → D3 RST → RST 3.3V → 3.3V GND → GND EN → GND When flashing Wemos LED is ...
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56 views

How to wire MCU control signals with power and ground to control multiple external motors?

I'm working on a system based on a NodeMCU/ESP8266 WiFi controller, which controls two separate motor units, each consisting of a 12V motor and solenoid actuator. For practical reasons, I need to ...
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1answer
98 views

Relay switches to ON/OFF rapidly

I have this relay circuit that can be turned ON/OFF by NodeMCU ESP32 GPIO18. This circuit allows current to pass through the RL2 even when NodeMCU is turned off. When GPIO18 is HIGH, it will switch ...
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2answers
100 views

AMS117-3.3 is giving 4.3v and also magnetic field in PCB

I am trying to build a small circuit using an ESP8288-12E, 4 5V relays and a 74HC595 shift register as the main components. To power the whole circuit I am using a Hi Link HLK 5M05 5V/5W switch power ...
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31 views

getting delay in serial communication between arduino nano and nodemcu

I am making a project of transformer health monitoring in which I am taking sensor data from an Arduino Nano to a Nodemcu and then uploading to Ubidots server. The problem I am facing is that I am ...
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36 views

Turn on/Turn off circuit using one momentary button. Also, turn off the circuit using a command from NodeMCU

I have this 5v and 3.3v voltage regulator circuit using 12v input voltage. This voltage regulator circuit is used to powerup my NodeMCU and several sensors. Now, I'm having problems creating a circuit ...
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16 views

Turn OFF a PUSH ON/PUSH OFF circuit from NodeMCU

I have a PUSH ON/PUSH OFF circuit using one momentary button. I want to turn it off using a command from NodeMCU. In the image/gif below, I did manage to turn it off from the simulator. In reality it ...
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1answer
53 views

How do I make a high signal last longer so my nodeMCU/Tasmota sees it?

Problem I have a data input signal to a nodeMCU running Tasmota. It only works intermittently because the signal often isn't high long enough for Tasmota to sense it. So I need to find a way to make ...
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3answers
244 views

Does level shifter have a maximum speed?

Of course it does, but what's it likely to BE? I have a string of WS2811 LEDs which accept a 5V logic signal. I am running them from a LoLin board, whose GPIO ports output 3.3V logic. I've put a ...
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47 views

NodeMCU AT Commands with UART not working

Hi, here are my specs :- PIC16F877A microcontroller NodeMCU (reflashed and got AT commands working via software only) XC8 Compiler (using MPLAB X IDE) Question :- What I'm trying to do is, trying to ...
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0answers
78 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 ...
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1answer
23 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 ...
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1answer
39 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 ...
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0answers
76 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 ...
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0answers
48 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. ...
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31 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 ...
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1answer
47 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 ...
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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, ...
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0answers
65 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 ...
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1answer
73 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 ...
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1answer
40 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'...
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3answers
58 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 ...
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1answer
62 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 ...
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0answers
27 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 ...
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1answer
76 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
54 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
117 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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1answer
299 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
519 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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1answer
32 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
755 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
75 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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1answer
2k 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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0answers
45 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
75 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
57 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
26 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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0answers
582 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
96 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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0answers
674 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 ...