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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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35 views

Ov7670 (without FIFO) captures the images twice at the same time

I recently started working on an security camera system, with an arduino uno and an OV7670 camera without FIFO memory, and an ESP-8266 to transfer the images to a webserver. Everything is working, ...
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1answer
57 views

ESP8266 like WiFi modules [closed]

I am trying to make a circuit using Nodemcu ESP8266 to control the speed and direction of 3 DC servo motors, however I am short of analog pins. So are there any ways to increase the number of analog ...
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1answer
21 views

WiFi.setOutputPower();

I'm trying to cut my esp8266 range down to about a meter to save power. I know that I can adjust output power but I don't know enough to understand what a given setting will actually yield. I can ...
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28 views

Arduino Uno + ESP8266 - Get Request with AT Commands

My project consists of passing some data read by some sensors to a server with an Arduino Uno board and an ESP8266 module. I have managed to send data using thingspeak.com but when I try using my own ...
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0answers
20 views

ESP-01 shows fatal exception or gibberish when AT commands are given

I'm using esp-01 for an home automation project. After a lot of trouble I was able to flash the AT firmware. Still, when I type AT commands in the serial monitor, I get the following errors fatal ...
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40 views

DNS Fail error in ESP8266

I am trying to connect to server using at commands: AT+CIPSTART="TCP","newsapi.org",80 ESP8266 response: DNS Fail ERROR
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1answer
50 views

HTTP get request using Arduino Uno and ESP8266

I have an Arduino Uno and an ESP8266 and I want to send a HTTP get request to google.com and print the response. Please help me thanks.
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0answers
80 views

OTA port not showing up

I am using the BasicOTA file and after uploading and rebooting the board everything works and I get a message in the serial monitor saying "Ready" and my board's IP address. However, the board doesn't ...
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1answer
215 views

Why does using ESP8266 in deep sleep mode still drain the battery quickly?

I've made a "weather station" using the ESP8622. To save battery I'm using sleep mode but still the battery is drained after a couple of days. According to this post it should last at least a year. I ...
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1answer
24 views

What is the difference using library of SoftwareSerial.h and ESP8266WiFi.h?

What is the library I should use to upload the sensor data (ultrasonic and Infrared sensor) to the localhost server. Because I saw some of the online resources using ESP8266WiFi.h library for the ...
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2answers
42 views

Print uint8_t in arduino

I'm learning esp8266 using arduino IDE. I'm still a beginner in development board programming. What I've been trying to do is use a crypto library. I am trying out AES in arduino and I chose that ...
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27 views

WiFiEsp library TIMEOUT if do something after client in loop

i don't manage to find out a solution with my code using ESP8266 (esp-01) and WiFiEsp.h library. I can receive datas easily but when i add some code after client.stop(), the library stops run the code ...
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1answer
34 views

Arduino pins vs Esp8266MOD

I had used Arduino Uno & RFID but now i want to run same code in Esp8266MOD. i have installed all the drivers and everything else to run esp8266 in Arduino IDE but i dont know how to connect rfid ...
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1answer
28 views

ESP8266 Stops Working if I don't provide Wifi during specifc step

To test the WiFi connection I'm sharing the WiFi of my cellphone. If I stop the WiFi sharing during the command below, the ESP8266 stops working. It only works if I do a hardware reset. If I don't ...
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1answer
48 views

nodemcu esp8266 does not boot up when 5V pin is connected as a VIN source

Whenever I boot up the esp8266 or flash code via usb ,I have to remove vin pin otherwise it does not boot up. If I remove vin pin then flash and boot up happens and then i am able connect vin with 5 ...
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1answer
100 views

ets Jan 8 2013,rst cause:4, boot mode:(1,7)

I am facing a issue with the ESP8266-01 as the following below: chksum 0x42 csum 0x42 ~ld ets Jan 8 2013,rst cause:4, boot mode:(1,0) wdt reset Anyone has the solution please help!! #include <...
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1answer
36 views

How to find the difference between two timestamps

I'm using this time library to access the properties of unix timestamps like hours / minutes / etc. What I want to do is get the current time, and an estimated arrival time, and find the difference ...
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2answers
24 views

Arduino esp8266 interferes with analog sensors

UPDATE: I tried CNY70 sensor and the same error is valid for it too. Even outputs of CNY70 and LDR is the same while ESP8266 plugged in. I think ESP8266 interferes with all analog sensors I connected ...
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1answer
37 views

Idenitifying pins in my code. which pin is which?

I'm new to arduino and knnow nothing about electronics. How do I idenitify which pin is which in the coding? eg- I have a pin on my esp8266 "D3"... how would I reference that in the code?
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1answer
31 views

library mixing log4Esp & Syslog for esp8266

has someone finaly made a new lib combining log4esp and syslog cf : SyslogAppender for log4esp thanks:!
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1answer
98 views

How to allow cross-domain requests on ESP8266WebServer

I am using a Raspberry Pi running Chrome (handling the user interface) and connecting via ajax to an Arduino D1 compatible using the IP address as follows: $.ajax({ type: "GET", ...
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2answers
43 views

ESP8266 library: 2 requests received instead of 1

I have a strange issue with my sketch using WiFiEsp.h library from https://github.com/bportaluri/WiFiEsp When i send 1 request to my ESP8266 from my browser as http://192.168.0.25 , it seems that my ...
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1answer
38 views

ESP8266-01 wdt reset after uploading code

I'm using code from here: ESP8266 example: Wi-Fi Access point, static IP, web-server and remote GPIO control. Everything running ok this morning, but now I don't know why wasn't working... This is ...
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0answers
28 views

MHZ19 + Debug via Putty: Network error: Connection timed out "

I am combining this library to read my mhz19 with RemoteDebug over Putty but I am not getting any output in Putty. I don't know if the problems comes from the way I upload the file or from my sketch....
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1answer
39 views

ESP 8266 wifi Shield, HTTP GET [closed]

ESP8266Client client; client.connect("192.168.100.100", 5000, "/abc.php"); client.read(); client.stop(); the ESP8266 Client does not have 3rd parameter can anyone provide me example on how to GET"...
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1answer
39 views

How to build a wireless pump controller using arduino and esps? [closed]

I want to have automatic control for my pump, wirelessly. A transmitter unit fitted in the water tank would sense the water level and transmit the data to a receiver unit attached to the pump ...
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1answer
31 views

Wemos D1 mini fatal exception

I'm trying to flash a Wemos D1 mini ESP8266 board with the blink sketch, but get an error. The built in LED turns off when flashing starts. Sketch uses 247872 bytes (23%) of program storage space. ...
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1answer
37 views

How to avoid Multiple definition of 'Blynk' error?

By including #include <BlynkSimpleEsp8266.h> Blynk library (https://github.com/blynkkk/blynk-library) from more than 1 module/cpp file, "Multiple definition of `Blynk’" error is thrown at ...
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2answers
94 views

ESP8266 ASCII to HEX convertion and checking

I am trying to convert ASCII to hex and check if the hex is equal to that hex that I want. For example: 1B 42 05 it means B in ASCII, I need to check if that hex is equal to 1B 42 05. Here I need ...
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1answer
67 views

FastLED: Can't address led individually

I'm unable to access the first led in my strip with this code: void loop() { leds[0] = CRGB::White; FastLED.show(); delay(100); leds[0] = CRGB::Black; FastLED.show(); delay(100); } Instead, it ...
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2answers
88 views

D1 mini does not resume operation as expected after deep sleep

I'm trying to get the D1 mini to return operation after ESP.deepsleep(). The code below compiles and gives the expected output for the first run. Five seconds after the announcement that that the ...
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1answer
53 views

Fail programing a Sonoff Dual with Arduino IDE

1) I have a Sonoff Dual, which I wish to upload a Sketch. 2) Other Sonoff basic devices programed the same way, with succes. But when uploading the sketch the ( even the generic Blink sketch ) - I ...
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1answer
50 views

How to connect ESP8266-01 (AT-commands) to its web server using AJAX

I am just new on using AJAX in web server, I got an error on declaring "server" I am confused about this because I just used only a AT commands to used the ESP8266-01 (wifi-module) I hope you can help ...
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1answer
53 views

How to / is it possible to change Vendor Name in ESP8266-12E?

I am aware of that it is possible to change hostname for ESP8266 but I want to change vendor name also so that it lists my company/product name in routers/firewalls. Is it possible?
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1answer
57 views

How to use php file_get_contents with ESP8266

A part of my project need to get datas from an ESP8266 with php script. I tested this script and i don't know why i can get the datas in an iframe element and nothing with file_get_content function. ...
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2answers
33 views

ESP8266 feather huzzah wiring for MFRC522

I'm trying to wire the mfrc522 and the huzzah but i can't seem to figure out the rst pin. I found the pin out diagram but it doesn't show or idk how its labeled as.
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1answer
46 views

Fetching txt file's contents from a webhost using esp8266 [closed]

I am trying to access a txt file in my website and fetch its contents that is hosted by 000webhost. I used this code: void sendGET() //client function to send/receive GET request data. { WiFiClient ...
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1answer
27 views

The Capacitive Sensor library on a D1 Mini

I want to set up a hand-made capacitive sensor on a D1 Mini, as in this tutorial, so that I can get specific capacitive readings. But I couldn't get the CapacitiveSensor library to work with the D1 ...
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1answer
52 views

esp8266 WiFi Cannot Connect to a PHP Server

I am using a magnetic float switch sensor to monitor water level in a tank. I am using a ESP8266 board. I am trying to send the data collected by it to a php page in a host called "weris.link". I've ...
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2answers
322 views

Send data to a pc localhost with ESP-01 wifi module

i use a linux machine with a localhost php server installed. Wifi machine is connected to the ESP-01 module (access point mode) and i can send several datas to the Arduino via the ESP-01 set as: ...
2
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1answer
178 views

How can I tell the resistance of an internal pull-up resistor?

I have a SparkFun ESP8266 Thing Dev board, to which I want to perform a digitalRead() on one of the GPIO ports. I'm using D15, and I'm configuring it for input like this pinMode(15, INPUT_PULLUP); ...
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1answer
32 views

The ESP8266 connects to open WiFi hotspots, even If I supply a password

This question is more out of curiosity, then out of a need to solve something. I was trying out some experiments with the ESP8266 Arduino core when I realized that I had programmed an SSID and ...
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1answer
90 views

ESP8266WebServer how to parse Json payload in post request that is bigger than the ram

I need to post a big json to the nodemcu server which would be bigger than the ram's size I am using esp8266werserver and arduinojson libraries. I know how to use arduinojson to parse huge json ...
2
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1answer
34 views

How do I connect an accelerometer (GY-521) to a SparkFun Thing Dev (ESP8266)?

All of the wiring diagrams I've found for wiring up a GY-521 accelerometer to an Arduino have looked something like this: I've read in several places that it needs to be connected to A4 and A5. I ...
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0answers
33 views

Arduino esp8266 EEPROM lag

Trying to save my LED-State to EEPROM. After every 5 seconds my EEPROM saves the value of white in this example (didn't put in RGB yet) When the EEPROM gets commited and the value changes the LED is ...
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1answer
74 views

How to build a valid HTTP Response. Recv failure: Connection reset by peer

I'm developing an Arduino server that should respond with a message when it receives a POST Request. If I test my project with a HTTP Client (like insomnia or postman), I get an error: Error: ...
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1answer
50 views

Communicating with a 12V device?

I'd like to connect a 12V access control device to the Arduino, but I lack the understanding. How can the signals from and to the device be done when they have different voltages? I am afraid ...
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1answer
99 views

ESP8266 WebServer not responding (connection time out)

My web server running on ESP8266, stop working after while. I cannot connect to it - browser shows connection time out error. No error, no crash... nothing. Have you any idea how to fix it? My code: ...
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0answers
12 views

controll intigers from webserver on nodeMCU esp8266

I would like to controll neopixel leds from over wifi with my nodeMCU but i dont know how to controll values over wifi, through a web interface would be perferable over url, but that also works. usinf ...
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1answer
60 views

How to access a website running on my localhost(host/server) to Serial Monitor using ESP8266(Client)?

The following source code is from the official ESP8266 website(Explanation provided): https://arduino-esp8266.readthedocs.io/en/latest/esp8266wifi/client-examples.html This .ino code returns the html ...