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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16 views

Cactus Micro Rev2 ESP Serial Communication [closed]

I'm trying to communicate with ESP via Mega32U4. I successfully upload .bin file with NodeMCU flasher but it doesn't give any respond. I can't even communicate simple serial. ESP side sketch file: ...
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36 views

Esp8266 LM35 Heat Sensor analogRead Problem

I have an arduino uno and esp8266 with wifi. I can get data from lm35 sensor when i wire it to arduino uno but i can't get data from same sensor when i wire it to esp8266. I also have a potentiometer. ...
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38 views

ESP8266 not responding to AT commands [closed]

I'm trying to get my ESP8266 module to get working, but I can't seem to be able to do it. I have made the connection between ESP8266 and my Arduino MEGA2560 board, but the module is not responding at ...
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31 views

Arduino ESPTelnet.h library read data from cmd screen

I am new to Arduino. I used Arduino IDE for upload code to ESP8266 module. I wrote an ATM application on the tiva-tm4c123 board. I am trying to connect to the application from the internet using ...
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60 views

Control relays with ESP8226 WIFI module and Arduino Uno

I am new with Arduino and I am using an Arduino Uno, could someone help me make this code work or tell me what's wrong with it? I am trying to control relays with ESP8226 WIFI module and Arduino This ...
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36 views

NodeMCU ESP32 as a replacement for my arduino project

I would just like to ask if this microcontroller can power or can manage 2 servos, 2 motors, and 2 hc-sr04 ultrasonic distance sensor combined? Also, does this board come with a bluetooth module?
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73 views

How to read wireless doorbell's indicator LED circuit

I have a cheap wireless doorbell. My plan is to include an ESP8266 and power the doorbell from the microcontroller 3.3V output as the doorbell also runs on 3V I specifically chose a model with a LED, ...
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1answer
89 views

ESP-01 Chip getting hot after connecting CH_PD to 3.3v

I am new to esp8266, Sometime when I connect CH-PD to 3.3v, esp chip starts getting hotter and everything stops working this is completely random so I don't know what causing it.
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59 views

Arduino Uno Esp8266 AT commands

I am trying to send AT commands to esp-01 through serial monitor I have uploaded a blank sketch to Arduino , whatever command I send to ESP I get reply ERROR. After reconnecting esp-01 I got some ...
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37 views

Connecting Arduino Uno's TX pin directly to Esp8266 esp-01

I am new to esp8266 esp-01 and trying to figure out how to use it, in many tutorials on internet, I have seen people have connected Arduino uno's TX pin directly to esp8266 esp-01 without any voltage ...
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26 views

I can't push a value to Firebase [closed]

I want to send my DHT11 data to firebase Arduino Code : #include <dht.h> dht DHT; #define DHT11_PIN 3 void setup(){ Serial.begin(9600); } void loop(){ String receive = "&...
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73 views

How to send data from esp-01 Wi-Fi module to arduino

The L1 is the value i will get from firebase database, but now i wanna send the value that i receive in realtime database to arduino to on LED, how to solve? any suggestion? which mean when arduino ...
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39 views

ESP32 WROOM32 SPI EMF issues

I'm trying to run Waveshare SSD1327 128x128 screen via SPI on ESP32 WROOM32 board. On ESP8266 (D1R1?) it works flawlessly while using HW SPI but when I run it on esp32, anything connected to mains ...
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62 views

Sending Data Between Arduino Nano and D1 Mini

I am sending data from Arduino Nano to D1 Mini, Transmitter is Arduino Nano Transmitter Code: #include <DES.h> #include <SoftwareSerial.h> SoftwareSerial link(2, 3); // Rx, Tx DES des; ...
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40 views

Pass Byte Array to Char and Send to a Separate Arduino

I am trying to send data between Arduino Nano and D1 Mini (ESP 8266 Module) My Code as below in Nano which will be the transmeting , #include <DES.h> #include <SoftwareSerial.h> ...
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56 views

esp8266 analogRead of 5.5V soil moisture sensor input using voltage divider

On an ESP8266 I try to analogRead(A0) my soil moisture sensor using a voltage divider but I get unexpected low values. The MT3608 increases the esp's output voltage from 3.3V to 5.5V which is the ...
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59 views

About Finxing ESP8266-01 ERROR UPLOAD ARDUINO IDE (esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header)

I have one ESP8266 01 and can not write blinking example on it, so I have made the below connection on it based on this video, but I get the below error: Global variables use 27980 bytes (34%) of ...
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50 views

Unwanted Wi-Fi Jamming by ESP8266

I bought an ESP8266-01 module. I attempted to upload following code onto it. void setup() { // put your setup code here, to run once: Serial.begin(9600); } void loop() { // put your main code ...
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CRC doesn't match, file is corrupted. It may be a temporary problem, please retry later [closed]

I have problem with installing esp8266 board manager and get the below error via my Ubuntu Os : I googled the error (Arduino CRC doesn't match) and found some result like this but don't find the ...
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26 views

How to get the value of a measurement transmitted by a BLE device?

I would like to use a BLE temperature sensor (such as the Inkbird IBS-TH1 Mini BLE Sensor), however, I want to be able to display the temperature measurements in my own website. To do this I am ...
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38 views

Why when I try to connect my ESP8266 to my node sever in my localhost it keep getting disconnect and connect?

I think the issue is within the library because I have try to implement this code according to the tutorial that I found in YouTube Youtube. The discussion of this tutorial is the first they implement ...
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ESP8266 AutoConnect ACSelect selection index

I'm trying to retrieve the current selected/saved index of my AutoConnectSelect Right now i'm creating a type that reads the saved json: AutoConnectSelect& bright = settingsAux["...
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952 views

Same structure taking different memory space on Uno and NodeMCU ESP8266, leading to data corruption when transferring via nRF24L01+

I'm trying to transfer data between a Arduino Uno board to a NodeMCU ESP8266 board, using nRF24L01+ transceivers module and RF24 library on both side. The data I'm transferring are stored in a struct ...
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102 views

Why am I getting Invalid head of packet (0xF0) error when trying to upload code to esp8266?

Solved : In Mac I went back to Tools --> Boards Manager, then removed 3.0 and downgraded to 2.5 and it started working. I found the solution in this thread. The current connection between uno R3 ...
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42 views

esp8266 does not connect to blynk server [duplicate]

I've uploaded the code below to my esp8266, but it does not work and it shows random values on the serial monitor. I need help to resolve this problem. Regards. My code is used for dimmer project: #...
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31 views

Deepsleep ESP8266 Thing

I have been trying to get my ESP8266 Thing to go to sleep. Power LED has been disconnected. Problem is that the current consumption is initially (briefly) ~78 uA, but nearly always jumps up to ~540 uA ...
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30 views

ESP8266-01 module “AT” command testing not responding

Firstly I have connected the Arduino UNo to Esp8266-01 Module and uploaded the Simple Blink Sketch using Arduino Uno and It responded correctly as in the Blue Led Light on Esp8266-01 was blinking ...
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38 views

esp-8266 wont return php file echo

i am using a esp8266(esp-01s) with arduino uno and a screen. i am trying to get esp-01s to read an echo from a HTTPS website. but the esp connects to the domain(i think) but cant return the echo on ...
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29 views

Can't transfer information from esp8266 to arduino

I have esp8266. Which I am trying to set up to be a self-contained access point and server (tcp). ESP8266 is connected to ports 2,3 of Arduino Uno. On Arduino, I want to process all information coming ...
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1answer
36 views

ESP-01 OTA Error uploading

Im trying to do OTA upload from Arduino IDE. Uploaded BasicOTA to ESP-01 with flash size set to (FS:2mb, OTA 1019kb). ESP-01 connects and shows up in Port selection, but when trying to upload I get ...
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33 views

ESP autoconnect disable web interface

I'm trying to disable the web interface of the ESP autoconnect library, as i use it only for setting up a WiFi connection and settings for my project. Beyond the initial setup i only need the web ...
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1answer
61 views

how to communicate between Arduino Uno and ESP8266 via TX/RX Serial ports?

I am working on a project contains : ESP8266 as a WebServer that has a dashboard on web browser to control 8 relays connected to arduino. arduino uno board to control relays based on commands come ...
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37 views

how do i get data from the website? using arduino uno and esp8266

i have hosted a website on the 000webhost. And i have simply written a line in paragraph tags in html file( means i have created a html file..) so i want to know to know how i get data that data in ...
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2answers
40 views

How esp8266 gets response from server..?

#include <SoftwareSerial.h> const byte rxPin = 2; const byte txPin = 3; SoftwareSerial ESP8266 (rxPin, txPin); void setup() { Serial.begin(115200); ESP8266.begin(115200); delay(2000);...
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ESP 8266 making noise signals to led matrix

I'm building ESP8266 led matrix project, but my ESP sometimes makes some kind of noise that makes random pixels on the matrix light in all different colors. It seems to be random. Does someone know ...
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27 views

ESP8266 getting Soft WDT reset

I'm trying to get some data from website on my ESP8266, but when I lowered the baud rate (because there was noise when communicating to other devices) I keep getting this error 13:09:41.550 -> -----...
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32 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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1answer
54 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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38 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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1answer
93 views

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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1answer
159 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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45 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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24 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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505 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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45 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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30 views

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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2answers
81 views

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
87 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
108 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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21 views

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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