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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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44 views

Why am I getting an 'invalid conversion' error on compile?

I have one of these NodeMCU ESP8266 OLED Arduino Wifi Modules which I am trying to load with SpaceHuhn's deauther software from Github I am trying to compile the source code using Arduino IDE with ...
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50 views

Problems / doubts on battery-powered Arduino Nano WiFi weather station I built

I've almost finished my first Arduino project and I'm realizing I might have gone a bit over my head - I'm a web programmer, I have a very basic electronics knowledge and started tinkering with ...
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136 views

Error Compiling sketch for Arduino Uno(ld return 1)

I have got an telnet server with esp8266 + SoftwareSerial+ UNO, and here I want to on led with command ON . will be 1 or 2. It is for recive 1 or 2 numbered pins. And I extract pin from request with ...
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27 views

wemos ESP8266 fastled webmaster slave copies the master

I have been searching for a solution and attempting to make a solution where that a wemos running an existing project consisting of using a web server to control ws2812b lights, the basic code allows ...
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29 views

Parsing the data from an HTTP POST request on a ESP8266 / wemos

I'm sending an HTTP Post request on my Android App to my Wemos D1 mini pro and want to parse the incoming data (which is a json). My current code just prints out the whole POST request and I need to ...
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32 views

Why sometimes parsed data is null in WiFiEsp?

I'm setting up web server with args. As host.com/?pin=9. I parsed the response by indexOf and substring functions. In first connection response has been successfully parsed and number has been parsed ...
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47 views

Possible to put the ESP8266 in bootloader mode without a FTDI?

I am trying to upload something directly to the ESP8266 using the ESP8266 IDE. I have configured the ESP8266 to communicate at 9600 using UART_DEF and I have set the ESP8266 IDE at 9600. I see some ...
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1answer
62 views

Wifi module is not sending the data properly

I wrote a programm in c++ for Arduino Uno which is connected to a wifi module (ESP8266) and sends the calculated data to a server through wifi-Module with a http post request. The problem is that the ...
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22 views

About split string

Sorry my English is poor. I use nodemcu to get a json data. By this String alldata = client.readString(); But it turn this: HTTP/1.1 200 OK Server: nginx Date: Sat, 10 Aug 2019 04:53:16 GMT ...
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28 views

How can I program an ESP 10 module

I buy an ESP-10 module and I want to upload custom room to its flash. The problem is that there is no way to access GPIO 0 pin! Is there some way around it to upload custom room without connecting ...
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29 views

How to use ESPAsyncWebServer with SoftwareSerial communicating ESP01f

I'm creating a web server with using host.com/?ll="some". But I read that I can use for it ESPAsyncWebServer for this things. And how can I use it without flashing esp? If possible give me link to the ...
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44 views

Send HTTP request from Arduino UNO+ESP8266

I am trying to send an HTTP request from from an Arduino UNO through an ESP-01 connected by Serial. Communication with the ESP and connection to the AP work fine. But when i try to send an HTTP ...
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106 views

Parsing HTML GET request with params with WiFiEsp

So I'm Setting up webserver with esp-01f+arduino uno. I'm using WiFiEsp library. I want to toggle led on. Pin will be given in GET request by url. Example: host.com/?ledpin=9 How can I parse it, ...
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30 views

Creating WebServer with 5000 port with AT command(ESP-01f)

I'm setting webserver with toggle led. I want to create global webserver. I`m mean hat use server with global ip. For it I must use port too. global ip/local ip:port. I want to create on 5000 port. I'...
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55 views

ESP8266 and Arduino, using i2s and the built in adc?

I've done some extensive googling but haven't found any kind of proper documentation. Is it possible to use i2s with the built-in ADC on an esp8266 to sample audio? And if so: any sample code on how ...
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92 views

ESP8266 spend 10mA, even though It is in the deep sleep mode

I am using Nodemcu ESP8266. I want to know how much my ESP board consume the battery during sleep mode. as the Mannual said it spend about micro-ampere, but my multi meter said it spend 10 mili-ampere,...
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1answer
44 views

Buffer overflow error in ESP8266_SoftwareSerial library

I am running into buffer issues when running the Firmware.ino example here. The output from my Arduino serial log on baudrate 115200 (I put the ESP on baudrate 9600): Begin 01:17:15.538 -> ...
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83 views

Exception(28) when calling `WiFi.status()`

Exception(28) intermitent, apparently caused by low quality connection, when connecting to WiFi. Seems like it has something to do with WiFi.status(). Is this caused by a problem with WiFi,status() ?...
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36 views

AT Commands with NodeMCU

I have an NodeMCU with an ESP8266 32Mbit, I am trying to flash the AT Firmware as described in Non-OS AT Instruction Set with NONOS-SDK-3.0 but I dont get any responses. I have the MCU connected by ...
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47 views

Arduino with ESP8266 via serial pass through [duplicate]

I bought an Arduino Mega 2650 alongside a couple of ESP8266 chips hoping to make a wireless project take off. Using the basic serial passthrough code void setup() { Serial.begin(9600); ...
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100 views

TIMEOUT error when connecting ESP8266 to Arduino Uno

I am trying to set up my Arduino Uno to receive information from the internet, but I am having a very hard time finding proper guides online. I am using an Arduino Uno and ESP8266-01. I am trying to ...
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1answer
51 views

How do I properly use the WiFi capabilities of ESP8266?

I am creating a project with an ESP8266 (Arduino IDE) which requires it to serve a webpage to a client. The module will be connected to a WiFi network by default, but when that WiFi network is not ...
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1answer
42 views

My device doesn't recognize my Arduino

I'm planing to use the ESP8266 to create a web server as a start. My set up is: Arduino nano- Esp8266- Logic level converter as shown in the diagram. After I connected everything my device doesn’t ...
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237 views

input from push button

I have connected three push buttons to node mcu which are working properly, but display of output on COM port is very slow. It works properly when two buttons are connected, but not when three are ...
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1answer
141 views

How to send UDP data packet between two access point?

I am new to arduino programming and nodeMcu boards.I have two ESP8266 bards as access points and one board get some data form WiFi stations and resend that data to other access point. but the problem ...
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2answers
89 views

Lipo Battery level display using nodemcu

I'm designing a connected collar for pets for a project, for this I am using a nodemcu on ESP8266 powered by a Lipo battery I'm guessing around 1000mAh of capacity is enough for a respectable autonomy ...
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30 views

How to re-send UDP data packet to a esp8266 board? [duplicate]

I have several connected esp8266 boards. Lower level client boards connect to middle level esp8266 board and middle level board connects to the top level Esp8266 board (AP).When a client sends UDP ...
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40 views

How to connect ESP8266 to my home WiFi securely

I'm working on a home automation project using NodeMCU ESP8266. Most of the example projects I see online provide their WiFi SSID and password in plain text at the beginning of the code by storing ...
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1answer
37 views

Getting issues while using SoftwareSerial

I am trying to read string send from esp8266 esp01 to Arduino mega. When I use normal Rx and Tx ports, it works properly but when i am initializing new serial port using SoftwareSerial then nothing is ...
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34 views

Turning on controller with button and turning off with a timeout

I am making a device controlled by an ESP 8266 and am wanting to save power by having it power down when not in use. The desired behavior is for a momentary button press or vibration sensor activation ...
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1answer
30 views

Sending code for error detection facing problem with error not able to compile code

MY PROJECT CODE: #include ESP8266WiFi.h #include LiquidCrystal.h #include FirebaseArduino.h> #include HX711.h> #define FIREBASE_HOST "iot-based-smart-dustbin.firebaseio.com" #define ...
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1answer
42 views

How does WiFiServer.status() work?

What are the possible outcomes of calling status() on a WiFiServer from ESP8266WiFi.h? The only documentation I could find only says it returns uint8_t. Here's the link.
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1answer
143 views

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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1answer
85 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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1answer
39 views

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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20 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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1answer
124 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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380 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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114 views

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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37 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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30 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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1answer
104 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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92 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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1answer
38 views

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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1answer
199 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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30 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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1answer
123 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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1answer
99 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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1answer
34 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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50 views

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(...