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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19 views

ESP8266 Webserver does not respond

I am trying to reach the webserver running in my Wemos D1 Mini compatible board. I am trying one esp8266 example using Arduino examples "WifiManualServer" code below. I have replaced the SSI ...
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31 views

HTTPS GET request working on esp32 but not on esp8266

I'm trying to port my esp32 program to esp8266, and i've come across a problem where i can't get a response from a HTTPS GET request on esp8266, but on my esp32 the same code works fine. The function ...
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25 views

Get LFN from SFN with SDFat

I am trying to optimize the memory usage of my ESP8266 arduino sketch by using 8.3 SFN folder names internally, but LFN when needed for user output. Unfortunately when opening a folder by using the ...
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How to send int array with ESP8266 http post request?

I'm reading RFID cards' UID with an ESP8266 and trying to send that information to my web server hosted on a Raspberry Pi. I'm currently storing the UID in an int array, but the http.POST(); function ...
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41 views

How to convert to digital signal coming from phoneline [closed]

For this project, there are two things that I would like to be able to achieve. First, to convert the incoming signal to a digital form and to be able to do the reverse as well, being able to send ...
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1answer
61 views

ESP8266 Arduino Json object array deserialisation into struct

I'm trying to de serialize an array of JSON objects into a struct. Following the instructions given by the Arduino JSON assistant, I managed to produce this helper function: void JsonPreprocessor(...
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42 views

Can I add my Wi-Fi credentials to ESP module remotely?

I am working on Home automation project and I am stuck somewhere on connecting my smart switch board to internet through my home WIFI. Actually I want to connect my ESP module with my home Wi-Fi ...
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21 views

ESP12F works indefinitely, then gets stuck in unrecoverable hardware WDT “boot loop”?

I have a sketch running on a number of ESP12F modules (AiThinker). They can work for months on end, can be power cycled, can be moved around, etc. It is a complex sketch with multiple parts and is ...
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497 views

Why is this extremely simple code not working?

I have a problem with a for loop, and Serial.print("Its Working") does not appear. Seems simple, I've done it before, now for whatever reason, its not working anymore void setup() { // put ...
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35 views

ESP8266 and DHT22 reads wrong values after restart

I put together a circuit on a breadboard with Wemos D1 Mini (ESP8266) and a DHT22 sensor. Important to say that I am using ESP Home and configuring the code using the yml format. When it uploads the ...
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I was working on ESP module and got some errors. Can anyone please help to resolve those errors?

Code; #include <Keypad.h> #include <Servo.h> #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <PubSubClient.h> const char* ssid = "";//put your wifi ...
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ESP8266: Interfacing MAX485 TTL-to-RS485 on serial port

I am using the ESP8266 NODEMCU. I am aware that the CH341 on the NodeMCU is bridged to the serial pins GPIO3(Rx) and GPIO1(Tx). Hence, any data send on Rx and Tx is also visible on the serial monitor. ...
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1answer
44 views

How to use millis instead of delay? [duplicate]

Sorry if something similar has been answered before... I am working on a garden timer project that runs on a ESP8266 based NodeMCU and is integrated with Blynk. I have a waterNow function that ...
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1answer
37 views

ESP8266 ISO 8601 string to tm struct

I have a web service that returns timestamps in ISO 8601 format, e.g., "2021-06-25T12:00:00" I'm trying to turn the timestamp string into a tm type struct from the ESP8266 library <time.h&...
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ESP8266 not running when connected to 3V3 [duplicate]

I have a simple code that uses a tactile button and ESP8266. I have one wire going from GND to one leg and one wire going from D3 to the other leg. Works perfectly. When I start it up, I have write ...
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2answers
229 views

Arduino code not working properly (Please Help)

I am having some trouble getting my board to perform the function I want it to perform. This is a project I have due in a few days, and I have hit a wall I just can't seem to get past. Now, I will say ...
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28 views

Pn532 and Node MCU SPI

I'm trying the Android Hce example in this PN532 library. The serial monitor gives me "Didn't find PN53x board". Can someone help me? #if 1 #include <SPI.h> #include <PN532_SPI....
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24 views

NodeMCU server stops responding after a while

I'm new to NodeMCU and ESP. I've created a basic web server on my NodeMCU. The server works fine for the first few minutes after resetting the board or re-uploading code. But after about half an hour, ...
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50 views

ESP8266 requires two resets to wake up from deep sleep

I'm working with the following circuit using a NodeMCU: I have the solder jumper bridged between RST and BTN. In addition to what's in the schematic, pins 2, 3, and 4 of J1 are connected to the ...
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25 views

Can't connect to internet with Proteus Arduino project

Can any one help me with making a connection to the Internet or localhost using any way to make that possible without any physical components (just virtually by simulator)? I've tried many ways such ...
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1answer
52 views

Arduino ESP8266 HTTPS Request returning empty response

I want to get some JSON data from a HTTPS secured Webserver using a ESP8266. For some reason I'm getting an empty response, I believe there's an error parsing the GET request. In Chrome I get the JSON ...
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27 views

All AT commands return Fail

I'm trying to send data from sensor to ThingSpeak, but the AT commands always return Fail. They work sometimes and send data. But, most of the time they return fail. My Connections: ESP Arduino Gnd ...
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Esp8266 Not showing in Arp table of router [closed]

So I'm working on my senior project which is a smart irrigation system based on an esp8266 NodeMCU. Everything is fine but I can't bind the IP of the esp8266 on my router's ARP table since it is not ...
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Using or creating Wi-Fi Direct (P2P) connection on ESP8266

I want to make a Wi-Fi Direct connection with an android device using my ESP8266. According to ESP8266WiFi Documentation and ESP8266 datasheet, the board has a SoftAP mode which is I think what is ...
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33 views

How can I get an integer from an RFID tag from Arduino Mega to NodeMCU 1.0 over serial communication?

I want the number from an RFID tag read by a reader connected to an Arduino Mega to end up as a string on a NodeMCU connected to the Mega. I am trying to confirm that the string is on the NodeMCU ...
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16 views

Serial Communication between Node-MCU and Arduino Mega [closed]

Sir mane ardunio mega 2560 my programing k hy jo k different sensor k value lake display karty hy aur sir ab my us value ko server jo k thingspeak hy aus p bajna chahta ho sir aus k leye mane esp8266 ...
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Getting garbage values on serial communication between Arduino Uno and ESP8266 NodeMCU

I have created a weather station on ESP8266 NodeMCU which has a web interface with logs. I've connected DHT22 on ESP8266 NodeMCU and a BMP180 on an Arduino Uno. Arduino Uno sends pressure to the ...
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25 views

ESP32S v1.1 NodeMcu vs ESP32 DevKitV1

I have two different ESP32 development boards labelled "ESP32S v1.1 NODEMCU" (A) and "ESP32 DEVKITV1" (B). From what I can tell they have the same major components, but their pins ...
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32 views

ESP8266 + 4x TM1637 == possible?

I'm having trouble getting my NodeMCU connected to 4 x 4 Digit 7 Segment Displays. So far I've been able to connect 2 & get them to display things from the demo repository. However, after trying ...
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21 views

ESP32-CAM brownout detected on broad board power supply but not when using UART USB bridge

I have connected an ESP8266 and ESP32-CAM to a breadboard power supply. The ESP8266 works perfectly as long as the ESP32-CAM is not connected. When I connect the ESP32-CAM to the supply I get brownout ...
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29 views

Custom Font for Web Portal

I'm setting up a Relay controller using web portal. I'm not satisfied with web browsers available fonts. So I would like to use my own custom font. Is there a way, I can implement this ...
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Arduino UNO with integrated ESP2866 wifi not working correctly

I bought this "knockoff" Arduino UNO with an integrated ESP 2866 wifi module. But I can't make it work. I've followed this tutorial because it's the same product as I have, but I can't make ...
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1answer
21 views

Arduino esp8266 some times data will not be sent to thingspeak.com

I have made an arduino IOT that sends temperature data to thingspeak and works fine . Now I have two questions 1- In spite of active wifi connection from esp8266 toward the web , but why sometimes ...
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3answers
107 views

send values from arduino uno to wemos d1 r1

I have a weather project in which I have to measure the temperature and humidity ( dht22 sensor ), the pressure and other things and then show them in a local web page ( usings wemos d1 r1 ) in either ...
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1answer
70 views

ESP32 millis not working properly

I have a program which measures temperatures every 30 minutes and sends them to a database. Immediately after running the program the first measurement is sent, however, the second (which should be ...
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43 views

Getting a Wemos D1 Mini to work with a M1 Mac

The Wemos D1 mini won't show up on the new M1 Mac. I know it's related to the drivers but I just can't find a viable solution to the problem. Has anyone solved this?
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27 views

Commander volet roulant avec esp8266 et sinric [closed]

Comment programmer un nodemcu pour contrôler un volet roulant avec sinric à distance
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How to adjust Partition Scheme Wemos D1 mini pro?

I bought myself a WEMOS D1 mini PRO (16MB) for creating a quite large project. As I'm writing code, my memory is starting to grow. When I looked at the Flash size in Arduino IDE, the only options I ...
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34 views

ESP8266 Repeated Crashing When Pulling JSON Information

I am trying to create a simple LCD device that pulls a random Jeopardy question from here: http://jservice.io/api/random, then cycles through the category/value, clue, and correct question at the push ...
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97 views

How to pass input value from webpage form to Arduino code

I am trying to pass number from web server Arduino using input form, into SPIFFS file, using script. Here is webpage code. void handleRoot() { if (server.hasHeader("Cookie")) { // ...
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28 views

AT command AT+CWJAP command always fail when connect to wifi

Refer to connect to wifi from https://www.cooking-hacks.com/mysignals-hw-ehealth-medical-biometric-iot-platform-arduino-tutorial.html #include <MySignals.h> #include "Wire.h" #...
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Servo starts spinning 360 degrees after a few minutes

I'm using my ESP8266 as a web server to tilt a camera with the servo Tower Pro Micro Servo 9G. #include <Servo.h> #include <ESP8266WiFi.h> const char* ssid = "SSID"; const ...
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1answer
43 views

Compiling for Wemos D1 mini with Visual Studio Code

I'm giving Visual Studio Code (VSC) a try and am getting unexpected results. I have a program (sketch) that compiles fine in the Arduino IDE. I create a workspace in VSC, initialize the project, and ...
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1answer
45 views

Problems with compiling more then one sketch in the Arduino IDE

I found this ESP8266-MQTT program on Github. How can I compile this thing with the Arduino IDE? I only can open one sketch at a time. If I try to compile this then parts of the program are missing for ...
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ESP8266 and Arduino Uno communication

I have a problem with my Arduino Uno. I am uploading the following code to my ESP8266. It reads temperature values from a sensor (DS18B20), puts them into a database, and prints them on the serial ...
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1answer
64 views

How to write & read from SPIFFS file as object data on ESP8266

I am trying write four digit number to SPIFFS file, and read that four digit from SPIFFS file and display on seven segment. The code, I am writing as below, I got "0" on each segment, but if ...
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46 views

ESP8266 wdt reset

I just bought a KS0354 ESp8266 board to make a remote control for my iot project. Not sure why I keep on getting a wdt error. Even before I can complete my entire code I start getting this error. ...
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36 views

Remove unwanted characters from char type

I'm working on an ESP8266 module that needs to fetch date data from worldtimeapi, everything works fine but the problem is How do I strip of the time field off the datetime JSON response without loop. ...
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33 views

nodemcu POST request over https return error code -1

I have a nodejs application deployed and have been trying to send data to the api using the following sketch on my nodemcu: #include <ESP8266HTTPClient.h> #include <ESP8266WiFi.h> void ...
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33 views

For an ESP, does the RESET or enable (EN) button always need to be pressed to start the Access Point? How to do it without?

Is there a way to start an ESP Access Point (AP) without pushing a button? All these are set up that way: AP circuits4you AP LastMinuteEngineers AP MicrocontrollersLab AP RandomNerdTutorials

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