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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2k views

Send custom 802.11 data frame with ESP8266 [closed]

I would like to send raw 802.11 data frames in order to transmit pictures with the ESP8266. I have the Espressif SDK 1.3 and so far I have tried to construct a packet and send it with ...
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1answer
353 views

Problem with action that should happen in loop(continuously)

I’m using WeMos D1 R2 and latest Blynk library and app. I am also using Arduino IDE 1.6.13. I am trying to read a button from the app, which works fine, but i want to read it continuously. Through the ...
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1answer
2k views

Relay active low and ESP8266 GPIO pins

I am using a ESP8266, specifically the ESP-12-E : I have a Relay, SRD-05VDC-SL-C connected to GPIO pin 4. It is wired in Normally Open(with my device to be powered wired into the top and middle pins ...
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729 views

ESP8266ex does not hold written EEPROM data, what could be wrong? [duplicate]

Solution: Need to call EEPROM.commit() after a write cycle. It is all about this board: It seems to be a NodeMCU V3, however there is no version 3 mentioned in the board list (also update board list)...
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2answers
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running a dc motor with a small L298N module and an arduino and the L298N library

I have a small L298N module which I would like to use to run a couple of dc motors. The module I have is smaller than most of the ones you see on eBay, it looks like this... I am trying to use the ...
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1answer
667 views

Time remaining with os_timer_t

The Ticker library for the ESP chips is quite useful, which wraps a os_timer_t object. I'd like to be able to see the time remaining on the timer, is it possible to do that witha os_timer_t object?
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espcomm_sync failed when connecting ESP8266 (ESP-01)

I'm new to the Arduino (I'm a developer but didn't have a chance to work with this kind of device before) and wanted to connect my ESP8266 to the Arduino Uno. I followed this tutorial but I got errors:...
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1answer
1k views

Sharing serial Rx to read a push button on ESP8266-01

I'd like to know if it's possible, and if so how to use the serial Rx pin in a shared way to read a push button? I've seen people using it in sort of a dedicated way but my idea is to use it ...
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0answers
1k views

Wake up ESP8266 with multiple GPIOs

I am building a ESP-07 based IOT device, that detects the status of 4 doors. The device must connect to WiFi and send an http request, when 1 of 4 doors is opened. I want to place a reed switch, for ...
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1answer
2k views

Submit data from HTML form to ESP8266 [closed]

I need to submit HTML form from my remote website to my ESP8266 server using POST method. I'm looking for something like that : <form action="my esp8266 IP" method="POST"> <input ...
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812 views

ESP8266WiFi client.print() strange response

I am using a NodeMCU, so ESP8266. I installed the core via the Boards Manager at the last version. My goal is to control a GoPro camera through WiFi. I am getting mad with these few lines of code: ...
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1answer
8k views

ESP8266 PHP Web Server

I need my ESP8266 web server to load my website files with .php extensions. So far I managed to load .htm .css and .js files from my SD card, but when I upload PHP files on my SD card, they won't run. ...
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3answers
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ESP8266 disconnects after few hours

My system looks like this: ESP8266 is connected to Arduino Uno (2, 3 pins) and a relay's data input to Arduino's pin 12 and power for relay is provided from another source. Arduino gets data from ...
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1answer
386 views

How to add additional sensors [Arduino]

I am new to Arduino. I have currently connected a FSR sensor to the TOUT pin of ESP WROOM-02. How do I add additional FSR sensor to ESP WROOM-02?
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906 views

ESP8266 ADC read analog

I have a 24CL256 external EEPROM, to which I wish to write 30,000 bytes of 8-bit data, reading from the built-in ADC of an ESP8266. Here is my code: void setup() { Serial.begin(115200); Wire....
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1answer
4k views

Can I get the current connection speed with ESP8266?

Using an ESP8266 I can get the RSSI of the Wifi network using Wifi.getNetworkInfo() or Wifi.RSSI(). But is there a way to know the actual connection speed in Mbps, after joining successfully a WiFi ...
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2answers
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Undefined reference to stdlib (strtof) while compiling

I'm trying to run the AzureIoTProtocol_MQTT/esp8266 example, but I get linker errors: Archiving built core (caching) in: /var/folders/fj/y3vtrz597kv4885q1b_5qypr0000gn/T/arduino_cache_934614/core/...
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2answers
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ESP8266 SPIFFS file not found

I have a simple HTML file that I have uploaded as sketch data using the ESP8266 sketch data upload tool in arduino IDE. The file is 7k in size. In the set up, I refer to the following function to ...
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2answers
2k views

DAC to play audio samples

I have a buffer which contains 16000 PCM samples of 8Khz 8-bit mono. I am trying to play it using 12 bit MCP4725 DAC. I have tried using micros() to control the write interval for the DAC. Here's my ...
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2answers
7k views

#include<ESP8266WiFi.h> showing error message

i was trying to send some data to a webpage via esp8266wifi module connected to arduino uno. My sketch contains a header file .After searching online I could get the library Arduino-master.zip from ...
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1answer
8k views

ESP8266 on WiFi without password, possible?

Is it possible to connect to an SSID that does not require a password? My project using ESP8266-01 modules will sometimes be used in non-password protected guest networks.
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1answer
5k views

ESP8266: system_adc_read_fast() always give 1024 as output

I need to use system_adc_read_fast (uint16 *adc_addr, uint16 adc_num, uint8 adc_clk_div) to get a sampling rate close to 100ksps. And I am able to achieve that using adc_clk_div = 32. However, when I ...
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1answer
3k views

Char* and string conversion from an ESP8266 web server

I have the following Arduino code for configuring a wifi connection through a simple webpage: I declare char* ssid;. Later I read a value from a SPIFFS config file where q_ssid is declared as a ...
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3answers
4k views

Can I power ESP8266 with more than 3.5 V?

I am concerned whether I need to use a voltage divider to power my ESP8266 module. My concerns stem from the warnings that I have heard in multiple tutorials. Everyone seems to regard the ESP8266 as ...
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2answers
4k views

Connect ESP-01 to USB Uart

for programming my ESP-01 chip I bought an "USB Uart", but it looks different to all the ones in all tutorials. I don't know how to connect the uart to the esp. The uart i bought has following pins: ...
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3answers
12k views

softwareserial between arduino uno and esp8266

I have an Arduino UNO and HUZZAH ESP8266 module. I need to send data between Arduino UNO and ESP module via Software Serial. Right now I have the ESP module write data and Arduino UNO display data, ...
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3answers
6k views

How to communicate with ESP8266 ESP01 by sending data through softwareserial on Arduino Uno?

I am able to send AT commands when connecting to the software through the TX/RX pins (1, 0) and the ESP01 communicates perfectly. However, as soon as I start doing that same thing with code I can't ...
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1answer
819 views

Can't fetch data from server using arduino and esp8266

I am trying to fetch some data from my website using esp8266 and Arduino, with the help of WiFiEsp library, I have got data from the website but don't know how to save that data in an array or ...
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2answers
6k views

Typing into ESP8266 with a USB keyboard

I need to be able to connect a USB keyboard, like a tiny Xbox keyboard, or a nice wireless one, into an ESP8266-based thing to type passwords into the MCU. Adapting the PS2 lib for AVRs (PS2==USB ...
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1answer
502 views

Ultrasonic sensor not getting reading while connecting to ESP8266

it's been week that i am having issue,that i can’t get ultrasonic readings when i connect with my esp8266 wifi module ,everytime it gives 0 cm reading.My both hardwares work perfectly if i connect ...
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4answers
162 views

ESP8266 networking [closed]

I am new to IoT. I have been reading articles to connect IoT sesors and updating data to Server. I want to connect 7 water pump stations ( all in different locations, and distance between each of ...
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2answers
2k views

Unable to upload the data on thingspeak using uno and esp8266

I am able to connect to thingspeak but now able to upload the data. here are my set of commands: AT+CIPMUX=0 OK AT+CIPSTART="TCP","184.106.153.149", 80 OK Linked AT+CIPSTATUS STATUS:3 +CIPSTATUS:...
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2answers
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ESP8266 send number in IP address

I want to easily send a number from a phone to my esp8266. I have an app that sends the number in the format IP/number. How can I modify the code to give my the number behind the IP address as an ...
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1answer
431 views

Low-power detect rise and fall of input signal

For a very low-power-project (where I want to keep the micro-controller asleep or powerless as much as possible), I need to detect the rising and the falling of an input-signal (which could power-on ...
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1answer
5k views

Connecting multiple clients to a server in Wifi

What is the best method or retrieving information such as temperature from multiple wifi clients with a ESP8266-01 ? I have one server and five client running with ESP8266. I have seen post ang Get ...
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1answer
960 views

How to send MFRC522 data to a C# app using a NodeMCU TCP server?

I am trying to send MFRC522 data to a C# application through a NodeMCU acting as an access point for the C# app. I have modified the code I got from this site. #include ESP8266WiFi.h> #include SPI....
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3answers
13k views

Getting error ets jan 8 2013,rst cause:4,boot mode(1,6) wdt reset

I'm working on a project to send ultrasonic sensor data to my webserver. For that I'm using ESP8266 WiFi module, 3.3V regulator IC by giving input volt of 5v from aduino uno. I successfully uploaded ...
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1answer
1k views

Where is the definition of system_adc_read() in the esp8266 Arduino code?

Where is the definition of uint16 system_adc_read(void) in the esp8266 Arduino code? I can see it being declared in Arduino/tools/sdk/include/user_interface.h, however there seems to be no definition ...
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2answers
92 views

Unclear GET request mixed values

In my Uno code, I access to a page in my server and retrieve that value and make decision upon that value. I get this kind of response, Connected to server on on off off on off [WiFiEsp] TIMEOUT: ...
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2answers
6k views

Finding ESP8266 in a network

I am connecting an ESP8266 to my home network (WiFi). After successful connection, an IP is assigned to it. I am sending commands to the ESP8266 from an Android app. What can I do to find the ESP8266 ...
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1answer
4k views

How to post JSON data from Arduino?

I want to post data that I'm getting from the sensor every 5 seconds to my application in JSON format. Initially, I'm getting data as int and converting into String. For example: if data=15, it is ...
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1answer
2k views

WiFi module ESP8266-01 for Arduino not working

I am new to using Arduino just bought my first one yesterday, and I also got an WiFi module. The Arduino I got is another brand but should be the same as the Arduino Uno rev 3 and I got the ESP8266-01 ...
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0answers
212 views

ESP8266 odd HTTP GET request

I'm using an Arduino Uno to send HTTP requests to my local webserver. To communicate to the ESP8266 I created a SoftwareSerial which is set to a baud rate of 9600. Whenever I send a HTTP request, the ...
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0answers
29 views

AT response clean-up

I am trying to get the response from server using AT commands. This is my program #include <SoftwareSerial.h> const byte rxPin = 2; // Wire this to Tx Pin of ESP8266 const byte txPin = 3; // ...
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3answers
2k views

ESP8266 Missing data from Serial

I'm trying to read all the available access points nearby with an ESP8266 module. Whenever I try to read all the available data from the ESP module and write it to the Monitor Serial it truncates ...
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1answer
2k views

ESP8266 returning 400 bad request

I am trying to get JSON data from my website using an HTTP GET request, but I'm getting a 400 bad request error. Can someone let me know why am I getting this error and how to fix that? I am tired of ...
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1answer
3k views

Receive data using ESP8266

I have connected ESP8266 to my Raspberry Pi's WiFi network and assigned a static IP. My Arduino code #include "SoftwareSerial.h" String ssid = "Rpi"; String password = "raspberry"; SoftwareSerial ...
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2answers
3k views

Lost AT+ commands on ESP8266 after flashing with “blink” sketch

I set my ESP8266 ESP-01 to flash mode and uploaded the example blink sketch on the arduino IDE esp example options. I know can no longer communicate with the ESP8266 using AT+ commands. I also cannot ...
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2answers
5k views

Serial Monitor not properly interpreting data from my NodeMCU V3

I've just received several LoLin NodeMCUs from a 'cheap Chinese ebay vendor'. They're working well except for the fact that I'm getting garbage in the Arduino IDE Serial monitor. I am able to: Load ...
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1answer
29k views

What is FaryLink? [Access Point]

When powering up my WeMos D1 ESP8266, I suddenly find this hotspot named "FaryLink". What is this? I programmed the ESP to work as a web server, thus connecting to an existing hotspot and not ...

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