Questions tagged [nodemcu]

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1answer
39 views

Limited WiFi with NodeMCU

I am using the following code to connect with the WiFi router: ...
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1answer
39 views

Connecting optocouplers to pins D3 or D4

I am trying to create a fairly standard setup: controlling 4 channel relay with NodeMCU. I decided to use optocouplers to make connections and generally have everything working now. However I learned ...
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2answers
85 views

Nodemcu: How to extend sensor wires?

I am using a Water flow sensor connected to v2 nodemcu. However, this sensor needs to be placed at a distance of 40 feets from nodemcu, on the 3rd floor of my apartment roof (I stay on 1st floor). The ...
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1answer
54 views

how to detect water level using NodeMCU in overhead tank?

I am making a simple water level alarm connected to my V2 NodeMCU. Using the principle of water conductivity. Two wires with stripped ends are dipped into the tank. As soon as the water level reaches ...
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1answer
35 views

Providing power to NodeMCU (ESP 8266) from 5V output of an Arduino

Is it possible to power a NodeMCU from 5V output of an Arduino UNO board? I was trying to use the Vin of the NodeMCU as the input from the 5V port of the Arduino. It didn't work. Could anybody please ...
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2answers
127 views

LED_BUILTIN output is not working on NodeMCU ESP8266

I have a new NodeMCU ESP8266. I made sure that the builtin LED on it was working properly by uploading the "Blink" example sketch from the Arduino IDE examples and it worked. When I try my ...
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0answers
43 views

What GPIOs in NodeMCU are usable

I am running out of usable GPIOs in my NodeMCU esp8266 board. I'm making a car. For the car I use L298N motor driver with 4 gear motors. The pins of L298N motor driver is connected as like this, 1.ENA ...
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2answers
152 views

Powering this circuit off 3A USB charger, but it's only supplying 350mA

I have a very simple circuit for a small RGB lamp I'm building. My plan was to power it off one of my many spare old USB phone chargers via micro-usb. It's just a string of 60 WS2812B LEDs with a ...
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1answer
38 views

How long can I power up a nodeMCU

I have a nodeMCU esp8266 and I'm going to power up the nodeMCU as long as possible but I need to know is it good to the health of nodeMCU. In other way I am going to power the nodeMCU forever.(...
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1answer
66 views

Can I power a nodeMCU using 3.7 battery

I have a nodeMCU board (3.3V) and a li-ion battery with 3.7 V. Is it alright to give the power supply from that battery?
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3answers
74 views

Wire gauge for sensor at long distance

I am planning for a home irrigation system and confused with the wire gauge required the sensors on the plants. The circuit diagram would be something like below: (Please consider the sensors as ...
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2answers
81 views

Understanding what exactly is the NodeMCU

So the NodeMCU looks like this: And the ESP12 is this: So I can see that the little ESP12 is riding on the NodeMCU. my question is: What is included in the ESP12 and what in the NodeMCU, in context ...
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1answer
145 views

Power NodeMCU from Arduino Uno

I am facing challenge in powering up NodeMCU from Arduino. My Arduino is connected with external power supply (12v). From Arduino, I connected 5vpin to NodeMCU <...
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0answers
244 views

ESP-01 Module CH_EN Pin Confusion

I have a custom board that I have developed where I am using the ESP-01 module. I have not connected CH_EN pin to GND or Vcc on the board. When I connect the module to the board, the Red LED lights ...
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0answers
31 views

NodeMCU http calls failing

I am trying to communicate between 2nodemcu v2, standalone everything works fine - webserver, api etc. but when I start communicating between both devices only first API hit works thereafter it ...
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1answer
108 views

How to find mAh rating of battery for my project?

I am using a NodeMCU ESP8266 for my project. The datasheet says it consumes 170 mA in active mode, and approximately 10 milliamperes in sleep mode. In my project, the NodeMCU runs 1 minute in active ...
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2answers
125 views

Relay not getting triggered from NodeMCU high

Please bear with me since am a noob in electronics. I made a relay module based on internet DIY tutorials. It turns on when I provide 5V from adapter to both +5V and signal but when I supply high of ...
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1answer
52 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
85 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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0answers
44 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
292 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
169 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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0answers
15 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
42 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
91 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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0answers
210 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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0answers
90 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
384 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
120 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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0answers
48 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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0answers
37 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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1answer
57 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
584 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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0answers
68 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
160 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
24 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
68 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
95 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
65 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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1answer
63 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
169 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
85 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
46 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
64 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
86 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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1answer
98 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
95 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
140 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
533 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 ...