Questions tagged [nodemcu]

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

Filter by
Sorted by
Tagged with
-1
votes
1answer
5k views

NodeMCU sensor values to web page [closed]

I post NodeMCU sensor values to a web page. But how can I pass those values to a database using PHP? Here is the code to post sensor values to a web page: #include <ESP8266WiFi.h> const char* ...
2
votes
0answers
9k views

UART from Arduino to NodeMCU

I'm trying to connect an Arduino nano to a NodeMCU 1.0 via the hardware UART, in order to send information one way from the Arduino to the NodeMCU (and from there to the network). I'm connecting the ...
-1
votes
1answer
2k views

Can i power Esp8266-Nodemcu with a solarpanel + usb-powerbank?

I was asking myself wether it's possible to power my nodemcu board (version 3) with a usb powerbank, like a smartphone, but the powerbank should then be recharged by a solar panel. So this is ...
0
votes
1answer
8k views

How to fix 12V RGB LED Strip connection to NodeMCU?

I am trying to hook 12V RGB Led Strip (LTROP SMD 5050 RGB LED Light Strip) to a NodeMCU unit. I know there are many different tutorials on this and I am very new to wiring and electric circuits. I ...
2
votes
1answer
1k views

ESP8266 Nodemcu create custom PWM with 1.25us resolution

I am trying to control some SMD LEDs WS2812B with the ESP8266-Nodemcu. I am using Arduino environment for coding. Actually I am trying to accomplish a PWM that is precisely able to: Go High for ...
2
votes
4answers
21k views

ESP8266 NodeMCU first WS2812 LED lights up green

I'm trying to power some WS2812 LEDs from my ESP8266 ESP-12E NodeMCU board (circuit here). I'm simply trying to use the NeoPixel Strandtest which works perfectly on my Arduino UNO with the same LED ...
2
votes
0answers
469 views

Rotary Encoder on LoLin NodeMcu increases value when rotating right/left

I have a test program running on my LoLin NodeMcu board, with a Rotary Encoder connected. I use Task.h and RotaryEncoderTask.h from this library: https://github.com/Makuna/Task (though my issue is ...
1
vote
3answers
608 views

DHT11 sensor works on Arduino Uno, not on LoLin NodeMcu

When run this code on an Arduino Uno (clone), everything works. When I run it on my LoLin NodeMcu, I get the following verbose upload output: esptool v0.4.9 - (c) 2014 Ch. Klippel <ck@atelier-...
1
vote
3answers
777 views

NodeMCU ESP-12e - Timing errors

I'm using the ESP-12e with Arduino IDE. With that I'm trying to build a clock with a WS2812B LED strip matrix that I've build. When I try to display the seconds on my matrix there are strange timing ...
0
votes
1answer
2k views

Low power wifi temperature sensor [closed]

I want to make a wifi-enabled temperature sensor and place it inside my HVAC system to measure and push the temperature to a central server, every minute or so. I have a LoLin NodeMcu v3 unit laying ...
-1
votes
1answer
590 views

Serial communication between NodeMCU and Arduino doesn't work when I try to use the DC jack or Vin

I have a unidirectional communication from NodeMCU (ESP8266) -> Arduino UNO. The communication works when I power both the devices to my computer. Note that since it is from NodeMCU to Arduino only, I ...
2
votes
1answer
3k views

Uni-directional communication between NodeMCU and Arduino spits out garbage

I am sending data from ESP8266 (NodeMCU) to Arduino using serial and 9600 baud rate on both sides. Since it is uni-directional and from NodeMCU to Arduino, I am not using a voltage regulator and I ...
1
vote
1answer
808 views

Get an additional analog pin?

I have the following board: As far as I can tell, there's only a single analog pin (A0). But I need at least 2 additional (for 3 total). Is there some way to fake analog input on GPIO pins?
2
votes
4answers
22k views

How to change the default name of ESP8266-12E module

Is there any way to change the default name (ESP_xxxxx) that the module generates?
1
vote
1answer
2k views

Wifi networking with ESP8266 (NODEMCU version)

I am doing some experiments with nodemcu 12 (which has built in esp8266). There most of the tutorials I found by internet describe how to connect to home wifi connection using it. But when I power ...
1
vote
1answer
3k views

NodeMCU : Input pullup in A0 [closed]

I am trying to port a simple project I have working in an Arduino UNO to a NodeMCU but I am stuck as I am using the analog gpio to receive the input from some buttons, I am always getting always low ...
-1
votes
1answer
3k views

Problems with Powering Led Project Through Vin Pin

I am working on lighting some WS2812 Leds with a nodemcu form hiLetgo. The project works when it is powered from the usb that is on the board, but as soon as it is powered from the barrel jack, the ...
0
votes
1answer
5k views

NodeMCU Arduino set PWM Frequency to specific frequency

I am using NodeMCU and I program it using Arduino IDE, I need to change the PWM frequency of a port, in Arduino I used to change the frequency using timers registers like that: TCCR1B = (TCCR1B & ...
5
votes
2answers
32k views

How to determine Flash size?

I need to determine the flash size of my ESP8266 on my NodeMCU module in order to flash the AT firmware onto the board. Apparently different boards come with differently-sized flash memories. Can ...
-1
votes
5answers
3k views

No Response to AT commands

I'm unable to communicate with my nodemcu ESP8266 module using the AT commands. The module does not return 'ready' on the serial monitor and entering AT commands has no effect at all. I am able to ...
-1
votes
1answer
3k views

Arduino/ESP8266 no SPI data coming from MCP3008

I'm using an ESP8266 (NodeMCU Dev Kit v1) to read analog data via an MCP3008 ADC chip. However I'm receiving only zeros when I know non-zero data should be present. I'm using the following code, ...
3
votes
0answers
325 views

Program nodeMCU Over the Air (OTA)

I have a Lolin NodeMCU V3 with a broken USB port: no power, no data. It does show up on WIFI as AI-thinker_xxx, I can connect, but what can I do next? Is there a way to program the NodeMCU Over the ...
15
votes
4answers
27k views

ESP8266, Arduino IDE vs Lua?

I'm planning to buy an ESP8266. Do I really need to learn Lua to play with it? I have seen some people using it with the standard Arduino IDE. Do you need a custom firmware to use the Arduino IDE ...
1
vote
3answers
16k views

Communication via IP adress with Arduino IDE and ESP8266

I have two Arduino boards and two ESP8266 modules with the NodeMCU firmware, and I want to make this: One Aruino will be connected to one module and a vibration sensor, and when this sensor detects ...

1
8 9 10 11
12