Questions tagged [esp8266]

An IC that offers Wi-Fi networking compatible with b/g/n standards. It also has integrated TCP/IP protocol stack. Extremely popular along IoT community as a low cost and powerful board.

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203 views

NodeMCU keeps disconnecting

I have made a home automation system consisting of a NodeMCU, 4 channel relay board running on Blynk and IFTTT. At the moment I'm only controlling a string of fairy lights and two LED strips from it, ...
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36 views

ESP 01 lost its firmware when it disconnected

Hi I am using Arduino uno & ESP-01 ESP-01 is working well when I put firmware to ESP, for example, wifi spreading or AT command is okay. but when I disconnect arduino from PC(disconnect USB ...
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Insane heat development with ESP8266

I have a ESP8266 on a Wemos D1 mini board. Simple "Rainbow with FastLED" animation. Shouldn't do much but the board gets so hot I can't touch it and it drains a 2500mAh battery in less than an hour. ...
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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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Which of the ESP8266 alternatives allows for full packet capture/injection in promiscuous mode?

I am part of a product group that is developing a low cost wireless intrusion detection system, for home usage. We have already produced and delivered to market ESP8266 based product however for the ...
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32 views

Connect Arduino and ESP8266 NodeMCU

I want to connect multiple sensors and see their measurements via ESP8266 Web Server. But, the problem is that ESP8266 has only one analog pin and I can't connect multiple sensors to it, so i need to ...
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15 views

error: espcomm_upload_mem failed

I use a Macbook. Currently 3 usb ports appear, but I'm getting the error in the topic header. What should I do? I think the usb port was not installed correctly. I'm using the Esp8266 circuit board. I ...
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89 views

Blynk.Begin(auth, ssid, pass) causing watchdog reset

I am trying to follow this tutorial and I keep hitting a problem repeatedly. I checked in my code that every time it hits the line Blynk.begin(auth, ssid, pass);, the serial monitor shows me that ...
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141 views

Understanding WiFi.printDiag(Serial)

I am having difficulty with setting up websockets using the Arduino IDE with an ESP8266 ESP8266 Websockets problem and I have added WiFi.printDiag(Serial) to the main loop of my code. The Output I get ...
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207 views

ESP8266 Websockets problem

I am trying to set up a network of 4 esp8266 programmed via the Arduino IDE. The Network will have 1 server (esp8266 running in AP mode) and 3 clients (esp8266 running in STA mode). I would like to do ...
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I need to connect Arduino uno with esp-01 and relay control via Android application

I have trouble connecting to esp8266-01 through arduino uno and controlling relay via Android application or a local web server. I did a lot of research. I do not want to use esp-01 independently. ...
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MAX7219 Does Not Light Up Using Wemos D1 Mini ESP8285 Lite

This is my first time posting, so I apologize if this is in the wrong place. I'm trying to build my first Arduino project that shows monthly revenue from Stripe's REST API using a Wemos D1 Mini ...
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27 views

How to read a specific amount of data via serial?

I'm trying to send data via serial from my Arduino nano to my ESP. Its an integer from 1 to 4 digits so something like 0, 13, 1234, 123, ... Every thing works fine but when the data comes too fast it ...
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63 views

http.POST is not sending data to local web page

I am using a nodeMCU to send data to my local web page developed using Spring boot but when I run the code I don't get an error the esp8266 connects to WiFi but I don't get anything on my spring boot ...
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1answer
116 views

Flashing ESP8266 ESP-12E/12F

I'm pretty new to Arduino programming and i'm trying to connect this ESP8266 module to my FTDI programmer but constantly getting this error on my ARDUINO IDE: esptool.FatalError: Failed to connect to ...
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i have a problem with mdns i'm using an ESP8266

I am working on a project on which I have to drive a DC 12V motor. I use an ESP8266 I manage to manage my engine remotely but my only problem is the mdns I use the mdns but it does not work. when I ...
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46 views

ESP8266 WiFiManager never manages to AutoConnect?

Running through examples of WiFiManager, and trying to incorporate the code into my own, it seems that WiFiManager (either version) never manages to connect using saved WiFi information. Starting my ...
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Is my esp8266 is broken?

I am trying to use esp8266 with Arduino UNO. I connected the wired as this I even tried switching the tx->rx / rx->tx and I used this code: // RemoteXY select connection mode and include ...
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38 views

esp8266 esp01s EEPROM and flashing

which flash option do I need to take to use EEPROM? Can I flash with 1MB and no SPIFFs and still write data to EEPROM? thanks T
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ESP8266-01 is not working and it's hot

it has been so long since I tried to connect the esp8266 through Arduino Uno and get it to work my goal is to send data from the Arduino Uno to web site, I have tried everything and a lot of codes but ...
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332 views

What is the use of reserved pins and SDD2, SDD3 pins of the NodeMCU?

How to use the reserved pins on the NODEMCU? What is their use? Also what is the use of SDD pins? Thanks.
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410 views

Get 5V output from NodeMCU [duplicate]

I have a sensor that requires used of 5V as input to Vcc. But I dont see any 5V output pins on the NodeMCU 1.0(12E). Is there a way I could get 5V output pins? Its not a duplicate question. I want a ...
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124 views

Activating a Relay with Wemos D1

I have a problem similar to these questions: Wemos D1 doesnt drive Relay Wemos D1 is not triggering Relay I got this BC548B transistor from an old apparatus I scratched. The transistor saturation ...
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15 views

Error Starting SPIFFS

There is a problem running a simple SPIFFS file system code on different versions of the Arduino IDE, as code shown below. In Arduino IDE version 1.8.4, works fine. No longer version 1.8.9, can not ...
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ESP8266 Webserver not reachable after 2 minutes from reset

I have a Keyes Espressif ESP8266 NodeMCU, I have two LEDs that I want to control which are connected to the ESP. When I open the webpage http://10.0.0.5/5 after uploading the sketch it works fine. If ...
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how can i send get and post request from esp01 using arduino uno

I am using an esp8266 01 module with the Arduino Uno to establish a communication between the Arduino and my web site. I actually don't know how to send Rest HTTP requests from the Arduino to get data ...
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121 views

How to Insert Data in Arduino's Direct Mysql

As inserted in a Arduino Mysql Direct Tablela I'm new to Arduino and would like to know how to do something in the code to make a copy in the database This code to pass the RFID and authorized ...
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155 views

How to upgrade ESP8266 NodeMCU SDK from V2.5.2 to V3?

ESP.getFullVersion() output: SDK:2.2.1(cfd48f3)/Core:2.5.2=20502000/lwIP:STABLE-2_1_2_RELEASE/glue:1.1-7-g82abda3/BearSSL:a143020Connecting to DO_231455 I upload sketches from the Arduino IDE. How ...
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66 views

How to send and receive data over LAN from an esp8266 operating as a station?

I have an esp8266, I have an led connected to one of the GPIO pins, I want to be able to control the state(high or low) as well as request the current state of the led from my computer which is ...
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358 views

How to create a wired ESP8266 range extender? [closed]

Context: I have a NETGEAR router on the first story of my home, the range doesn't extend to the ground floor. I do have a cable duct from my router(on the first story) to the ground floor. Question: ...
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596 views

Constant ADC sampling rate on ESP8266 or ESP32

I want to sample Sound input with either an ESP8266 (preferred) or ESP32. As I'm using a low pass filter anyway, a sample rate of 1000-2000hz would be totally ok. What is more important, is that it is ...
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Serial monitor garbage output on both MacOS and Windows devices, output used to make sense

Baud rate is set to 115200 in both the serial monitor and in the setup() portion of the code. The output to the serial monitor just looks like a bunch of reverse question marks on MacOS and on Windows ...
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58 views

How to use while loop in arduino for infinte loop

I am doing code of esp while switching hotspot for connecting esp i am getting some problem . I am using this line of code: while ((!esp.find("WIFI ")) || (!esp.find("+CWJAP:3"))); but it is not ...
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66 views

OLED shield for wemos d1 mini pro not staying on

I recently bought a wemos d1 mini pro to toy with wifi and bought a oled shield with it. I've been looking on youtube and github for software and I finally found the software and got it to load onto ...
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80 views

Multiple dht11 on an wemos d1 r1

I am trying to connect three separate DHT11 to my Wemos d1 r1. I have each sensor hooked to a power pin which turns on and off, the sensor pin and a common ground. Here is my code: #include <...
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Showing GPS Values on I2C LCD using Arduino and ESP8266

I am working with Arduino. I'm using 2 Arduino boards along with 2 ESP8266 modules to transfer data from one Arduino to another Arduino. I want to transfer GPS values from system 1 to system 2 using ...
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119 views

sending string from Arduino to ESP8266 works on UNO but not Pro Mini

I have a project where I am getting sensor data and sending it over to an ESP8266-01 to send to ThingSpeak. After some work I got it to work. So like I real smart person I decided to replace the ...
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29 views

Error with AT+CIPSEND in ES8266 with arduino

I'm making simple web-server on esp8266 module connected to Arduino. And when +IPD,0,GET... I'm sending AT+CIPSEND=0,16. Then I write HELLOMYDEARFRIDE. It says : send 16 bytes recived. OK. But in ...
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Creating WebServer ip:port on esp8266 module

I creating Clever House with wifi. For this I'm using ESP8266 as module connected to Arduino. They communicate with SoftwareSerial. And there's a problem with global webserver on ESP8266. That I think ...
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1answer
107 views

Sending data through esp8266 using arduino

I'm trying to send GPS data using esp8266 using Arduino board. I've used neo-6m receiver and esp8266-01 module. Below is my program using AT commands. The program is successfully compiled and loaded ...
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104 views

How to prevent FirebaseArduino's Firebase.failed() from returning true?

I have an ESP8266 receiving a stream from a firebase value. The value determines the state of an LED output D0. The stream works for the first few minutes after hard reset but Firebase.failed() ...
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1answer
30 views

Changing ESP-12E NodeMCU to ESP-01S - how to trigger sketch?

I had my sketch up and running with a NodeMCU and a Leonardo Pro Micro and decided I wanted to minimize the footprint of the project and use the smaller ESP-01S board instead. The ESP-01S is ...
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59 views

How to handle a ESP8266 webserver only to the access point?

I'm developing a application that needs to be somewhat secure, so to configure the parameters it handles a GPIO interrupt (from a button) to open a server, that lets you configure it. The problem is ...
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63 views

ESP8266 webserver does not return latest HTTP response

I tried getting a HTTP response from an ESP8266 which is in HTTP server mode, I am getting a response but not the latest one, response is always one command previous to that of my request to the ESP. ...
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Communication between IP camera and ESP8266

I'm working on IoT project. The part of it is about taking photos automatically basing on some sensor data. I have searched on Google but I couldn't find the information I need. Is it possible to ...
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96 views

Chip sync error while updating ATfirmware in esp8266

I find trouble updating my firmware with esp8266 with following error message. [espDownloader.py][line:351][ERROR]: Chip sync error: Failed to connect to ESP8266: Timed out waiting for packet header [...
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21 views

How can I control a slave ESP8266 from a local server and also from another ESP8266?

I have a power strip with a ESP8266 which is supposed to turn it on upon command from a OpenHAB server, or to stay on for a predefined time upon command from another ESP8266 (serverless). The reason ...
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29 views

Trouble with i2c on ESP8266

I have used with partial success I2C with the ESP8266. When it works, it works well, with many devices on the bus. I've examined the signals on a 'scope to assure Vlo, Vhi, Tr, and Tf. However, ...
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Is there something I can add to my ESP8266 script to track how much data it uses on WiFi?

I want to set it up on a mobile hotspot but I'd like to get an idea of how much data my sketch uses first.
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60 views

HTTP and HTTPS server at the same time

I'm trying to set up a HTTP and HTTPS server at the same time on an ESP8266 NodeMCU V3. The compiler however doesn't accept any other name than client otherwise no new clients will be catched. But ...