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Questions tagged [nodemcu]

NodeMCU is an open-source firmware that offers a Lua API for ESP8266, ESP8285, and ESP32. There is also a ESP8266 devkit with the same name. However, questions here should relate to writing Lua code on top of the firmware. Also if you need help understanding the NodeMCU API SO is the right place. Issues with firmware development are best addressed on GitHub. Hardware or general questions can be asked on esp8266.com.

The NodeMCU project is a Lua based firmware that runs directly on ESP8266, ESP8285, and ESP32 hardware, providing a easy and low cost solution. Build-deploy-test cycles are extremely short (contrary to e.g. Arduino) because you only build the firmware once and then simply update scripts on the device.

It provides access to almost all APIs in the Espressif C SDK. Hardware/SDK access is abstracted through close to 60 specific modules. The firmware comes with either integer or floating point support depending on your needs.

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Nodemcu ESP8266 12-F storage

I have just started working with my Nodemcu and was wondering when you upload codes using Arduino IDE on the device, how can you delete them from the storage? Would highly appreciate any clues. Many thanks.
milad
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Is there anyway we could use the data from rfid to fetch something from another website?

I made this project for my final project which is reading data from RFID and sending this ID to web PHP using Nodemcu Ardino.I actually want to assign some data to this unique ID and once this ID is scanned, use that particular information to search…
Shiraz jaf
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LCD ESP8266WiFi access point Send Text

hello i am trying to send data to lcd screen ,but they arrive as GET/ DATO /HTTP 1.1 I ONLY NEED TO ARRIVE DATA AND DELETE (GET/ /HTTP 1.1) I am used to the esp8266 by wifi in access point mode the program works well request is the data that arrives…
VLAD D ELECTRONICS
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Want to add Email sent function incase my temps are more than 8 appsscript

I have a code that I use to log temperatures into Google sheets..Code written in Appsscript. In this code, i want to add a function in the case 'temperature' that can send mail in case the incoming temperature to be logged is more than 8.. How can I…
MutwiriJosh
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Writing an long integer to an string as char* in Arduino function

i am fighting with this problem for all night long, and nothing working for me... I have tried with alot of methods founded on the internet, but i'm still locked here. All I want is to write an number in the middle of an char string to display it on…
Marcel Domuta
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ESP8266- Buffer storage capacity from the UART

I have an issue while transferring the values of string from UART to buffer. I am using ESP8266 to receive strings on serial from STM32 device. I have total 600 string and i have CSV file that is being transmitted from the STM32 device. I have used…
Naren2312
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How can I get input from undefined number of button Controller

If i want to get input from 20 to 30 buttons (Consider as a 30 Buttons of keypad), then what is the best approach to achieve it? Is these any keyboard available in market or I need to make it with my own talent? Better if you can suggest with…
Subhankar Majumder
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How to programatically identify which microcontroller is connected to my computer

I recently bought a NodeMCU ESP8266 and started playing with it. Even though almost all the scripts I've written for Arduino micro controllers work fine on ESP8266, there are some differences. For example, reading from the EEPROM or using the…
user7804708
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How to upload code for Blynk app to nodemcu using Arduino?

i am trying to make an anti theft door notification IOT app. I am using nodemcu,arduino for coding and a blynk app to operate it. I have already installed a drivers from the link for nodemcu. Now I don't why I am not able to upload a code. I am…
Payal Patel
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How to connect available application such as MQTT Dashboard, IOT MQTT Panel, ... to IBM BlueMix

I'm a student and I have a small IOT project at my university. I tried to connect MQTT Dash to IBM BlueMix IOT Flatform but failed. I can't publish/subscribe data on IBM IOT Platform. What do iI need to do?
SilverBoom
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Iot project With Esp8266 and Pi3 through a Web Browser

I am trying to build a smart home. I have some Esps to control the peripherals And I want to use the raspberry Pi as the hub/webserver The pi would host a website to allow the controls. I am not sure how to put it all together. The MCU lib can…
sakib11
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Access Multiple Sensors Value using Micropython in NodeMCU?

I am trying to gather inputs from five sensors and simply print the same but the return values always seem to return 1 or 0 regardless to change in the inputs to the sensors. The code used by me is as follows from machine import pin p0 =…
OshoParth
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Flash NodeMCU v3 without tools

I've got NodeMCU v3 board with ESP8266 chip on it. I'd like to flash it with my firmware through usb without using any tool like esptool. How can I do this from Linux? I've got several questions: 1) Can I just write for example to /dev/ttyUSB0? Will…
GarryLup
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NodeMCU multiple libraries error

How do I fix these errors in NodeMCU, which reports that multiple libraries were found for servo.h? Multiple libraries were found for "Servo.h" Used: C:\Users\username\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\libraries\Servo …
krishnapriya neema
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NFC/RFID module multiple cards

I have this NFC module. When i read ONE card at a moment everything works fine, but I need to read more that one card at a moment. One card laying on a module - module reads it ok, when I move another card over the module, I get a mix of both card's…
Oleh Kurpiak
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