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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Create one server in AP mode and another in station mode

I'm trying to connect one ESP8266 to WiFi as a WebServer in station mode and to another ESP8266 as a server (that has no web pages) in AP mode. The problem is both servers are being created in AP ...
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31 views

Query regarding ESP8266 WiFi library

I am getting this error when running code: Arduino: 1.8.9 (Windows 7), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled, All SSL ciphers (most compatible), 4M (no SPIFFS), v2 Lower ...
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42 views

Which is better millis() or timer?

I want to create a 30 minutes delay in my program (Arduino). which is better millis() or timer for this purpose? please give me an example to clarify my doubt ... Thanks.
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Can I connect this LED Matrix to a ESP8266 Huzzah directly?

This tutorial for the 16x32 LED Matrix makes it sound like you have to use an Arduino Uno or Mega, but the tutorial was also written a few years ago. I have a Huzzah ESP8266 (my project is about ...
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23 views

how to Use <SoftWire.h> _ MCP4725 for see analog out with Osc [duplicate]

i use softWire.h and want to send int value to SDA pin of the MCP4725 and take analog output and see that with Osc note: i receive int value with wemos ------- adc is my int value and boths is 12bits ...
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Error for compiling ESP8266 code

Getting this error while try to compile esp8266 board of version 2.5.2 as follows: esp8266: Unknown package Error compiling for board NodeMCU 1.0 (ESP-12E Module). Please help me to solve this ...
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13 views

Data not uploading on Thingspeak server using ESP8266-01 Wifi -shield

Here's the problem. My sketch has NO errors in it. I can see the output in the Serial monitor but the data is not being uploaded in ThingSpeak server. I've tried changing the API KEYs but it a'int ...
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43 views

i2c Connection for MCP4725(Dac) with Esp8266 wemos d1 mini

------------ This question has been edited ------------ note: Dac and Adc is12bits my problem : I use two ESP. Using esp1, I read the Adc amount of the alternating signal (ECG) and send it to esp2 ...
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28 views

ESP8266 Huzzah error: “Failed to connect to ESP8266: Timed out waiting for packet header”

I am trying to follow this tutorial but when I get to the step... "Once the ESP board is in bootload mode, upload the sketch via the IDE" ..I get the following error in Arduino IDE: File "[path]/...
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error compiling for board node MCU 1.0

Arduino: 1.8.9 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Serial, 115200, 4M (3M SPIFFS)" In file included from C:\Users\Priyaranjan Tiwari\Documents\Arduino\007mcu_php\007mcu_php....
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How to Send Digital Value (float) to SDA pin of the MCP4725 (DAC)? [on hold]

Hello to all I Want to Read a alternative signal input with #Adc and send it digitally to the #SDA pin of the "MCP4725" and get the analog output from the output pin and see that with OSC help me ...
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25 views

How to get interrupt while in sleep mode?

I am using Arduino-uno, attached ESP-01 module I want to give interrupt when I send some wifi-signal to arduino, which is in sleep mode. so I write this code: SoftwareSerial esp(2, 3); // RX, TX ...
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23 views

If an Arduino goes to sleep, does the attached ESP also sleep?

I am using Arduino Uno + an attached ESP-01 (ESP8266). I want to save battery, so I made my Arduino get sleep & interrupt by a watchdog timer. But if the Arduino goes to sleep, does the attached ...
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17 views

Power supply affecting sensor readings ESP8266 and JSN-SR04T-2.0

I have an ESP8266 Wemos D1R2 Board with a JSN-SR04T-2.0 ultrasonic range finder and everything works perfectly when I have the device connected to my computer USB or via a 12V battery into the onboard ...
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15 views

Connect UNO to WiFi using Huzzah ESP8266 without a Serial cable?

I bought a Huzzah ESP8266 to connect my Arduino Uno to WiFi, but now I'm realizing I didn't buy the cable that you need to connect the Huzzah ESP8266 to the computer...is there any way to program this ...
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Error for intallation of esp8266 board [closed]

Facing this issue while installing ESP 8266 Board I have deleted all temp files in Arduino15 folder then restarted IDE again facing this problem: Error downloading https://github.com/esp8266/Arduino/...
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Adding WiFi to my Arduino Keypad Lock

I'm a really passionate beginner with arduino and electronics and I've built a Keypad lock for my room's door (inside the house). I've used an arduino that activates a motor using a transistor to ...
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25 views

facing issue while installing ESP8266 Board running windows7 OS

Getting this following error while installing ESP8266 Board in board manager: I have copied https://arduino.esp8266.com/stable/package_esp8266com_index.json this link in preferences but when trying ...
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1answer
65 views

Float to String Convert in Udp.write() in esp8266

I want to convert float value to String for send Udp.Write() method and receive another side (esp) with Udp.read() and Copy in the one Variable for use .. please help me Thanks for every answer ^...
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23 views

EEPROM Esp8266 Memory Issue

I had assembled a board with esp8266ex bare chip with 4MB eeprom for esp and also can be shared with host MCU. I had gone through some googling and found that using eeprom function I am able to write ...
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How run timer according to user input? [closed]

I have a Bluetooth module,when Bluetooth receive data ,it send to esp8266 WiFi module. the data is a timer input.that is when user send "ON,10" then the timer create a delay of 10 mint. similarly ...
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1answer
35 views

How do I send MIDI properly with ESP8266?

So, I've finally able to send and receive MIDI using Arduino. My next thing to do was sending 5 pin MIDI to rtpMIDI, and vice versa, using ESP8266, but so far I can't even send MIDI correctly. So ...
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36 views

ESP - Nodemcu amica - attachInterrupt crash program

I get new boards from the shop but they are little different from the previous version. I got software what works ok on Nodemcu lolin v3 now I get Nodemcu Amica what is almost same board but if I got ...
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25 views

ESP12E Boot vs SPI

I was wondering how I could overcome the next issue; My ESP8266 12E is connected as follows: GPIO0 ground if needed to program, vcc otherwise GPIO2 vcc GPIO15 ground Bootmodes explained in the this ...
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Send time with ctime to firebase (time library , esp8266)

#include <ESP8266WiFi.h> #include <time.h> const char* ssid = ""; const char* password = ""; int timezone = 3; int dst = 0; void setup() { Serial.begin(115200); Serial.setDebugOutput(...
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43 views

Post Data Server from Arduino using Fuzzy Logic

Can somebody help me , when i run this code separately , no problem was found , but when i fuse it together , only fuzzy work and the data can't be sent to my server, sorry for my bad english i ...
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21 views

Can too much power consumption cause NodeMCU to trip?

I made a home automation setup that involves a NodeMCU and a 5v relay module. Now, this setup automatically disconnects from the WiFi randomly. It sometimes connects immediately, sometimes it takes ...
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29 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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1answer
23 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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1answer
57 views

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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IllegalInsctruction ESP32

My code #include <WiFi.h> #include <WebServer.h> #include "DHT.h" #define DHTTYPE DHT11 const char* ssid = "mySSID"; const char* password = "myPass"; String ptr = ""; WebServer server(...
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19 views

Serial Communication between arduino uno and esp8266-01 [on hold]

i want to send ultrasonic sensor value that connected to arduino uno to esp-01 module for send it to firebase, how can do that with code and connections arduino code void setup() { Serial.begin(...
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34 views

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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ESP PCB board grounding Issue

I have made a PCB with ESP8266-12E IC, 5v SMPS on it. (1)When i connect the Board to my PC using FTDI connecter it works fine. It detects the Active Low at the GPIO's (Simple Button function) ...
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27 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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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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19 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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1answer
23 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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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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22 views

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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1answer
24 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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27 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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32 views

Esp8266 module with 5v [on hold]

My esp8266 module clearly says vcc which indicate 5v but i have read that es8266 only work with 3v3 here are the images for my module esp8266 module image
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1answer
44 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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26 views

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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8 views

In HLW8012 schematic, where should the Referenced ground be connected [migrated]

In the datasheet of HLW8012, the both 33nF capacitors , 1K resistor and 0.1uF capacitor are connected to GND. I'm not sure where should I connect those ends of components marked with GND symbol, (To ...
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1answer
27 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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33 views

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 ...