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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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18 views

ESP8266 WiFiClient Slow Over LocalHost

Appears to be something to with Apache configuration, swapping to Nginx solved my issue. I'm getting slow responses when using localhost with a NODEMCU 1.0 and esp8266 WiFi library. If I GET a PHP ...
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1answer
15 views

Verifiy NTP server update - at start

I have function to start an NTP service, right after obtaining wifi connection ( using ESP8266 board ). from time to time, I get an error saying date and time is01-01-1970... which I assume is due to ...
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0answers
9 views

HD44780 display incorrectly black-on-blue instead of white-on-blue

I have a generic HD44780 compatible 16x2 LCD display, with an already soldered on PCF8574 module. Its backlight is blue, and the characters are supposed to be white (on blue). It is connected to a ...
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1answer
15 views

Compare incoming message from ESP8266

If there's one thing I never managed to do: it's comparing strings. So I have the incoming message saved here String Message2 = IClient[i].readStringUntil('\n'); And every time I try to compare it ...
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1answer
18 views

Correct Pins for Nodemcu 8266

I am building a small electronic project, and I am incorporating module nodeMcU 8266 in a box. I would like to know which pins are for "flash" and for "reset" I know there are 2 buttons on the module ...
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14 views

How to trigger a link using esp8266 in GET method?

I am trying to send a sms using a api called fast2sms . Notifications will be sent by triggering that link .I am new to this wifi module and I am not understanding how to trigger that link.
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12 views

difference between v2 and v3 in terms of connecting with firebase [on hold]

v2 is perfectly working when sending data on firebase but it doesnot work when sending a data through v3. can anyone suggest me the valid difference between v2 and v3 which is responsible for sending ...
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1answer
1k views

Difference between these two NodeMCU boards?

I recently received a NodeMCU (identical to the one shown in the first picture below) and originally, I was unable to connect it to my computer which eventually turned out to be driver issues; however,...
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1answer
25 views

How to use 2 serial port when WifiEsp library uses one of both

I try without success to receive datas from DataPort and transmit them to my computer via WifiPort, using ESP8266 wifi module. Each second, serial datas income on DataPort from another device. ...
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1answer
35 views

Can ESP8266 send AT commands to self?

I'm having some problems with my ESP8266 stopping transmission of MQTT messages after a while. Therefore I'm writing some error handling messages, and I want to publish some AT data to MQTT. It's ...
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1answer
50 views

How can write a single?

} Book; Book b1 = {"The Zahir","Paulo Coelho",336,0}; while writing this structure inunction but how can write a single data like name of book into structure
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2answers
2k 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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39 views

Esp8266 Vin pin

I've read that Vin pin is directly connected to usb cable in esp8266 (which is 5V). I wonder if I can power a relay 5V and a servo motor Sg90 with this pin? And is there any danger of doing that ?
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20 views

ESP8266 wifi at command did't work [on hold]

it showing like this rll⸮⸮|⸮l⸮| ⸮ l⸮ b|⸮⸮⸮⸮r⸮c⸮ c⸮⸮on⸮lno⸮⸮⸮ bp⸮lrlslp⸮n⸮ ⸮ l ⸮⸮ c n⸮|l⸮ ⸮b⸮⸮oo⸮l⸮⸮l⸮no lns⸮⸮⸮o b ⸮lr⸮⸮o b ⸮l⸮l⸮p⸮⸮⸮⸮`⸮⸮o⸮ how to shove please help me...! Whatpp No ...
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0answers
26 views

What is the Lifespan of NodeMCU 12-E? [on hold]

i am using the NodeMCU in a homeautomation project, how much does the NodeMCU last, and what about its efficiency? thanks in advance
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33 views

ESP-01 responding to some codes not all ; like of ADAFRUIT MQTT?

I am Arduino Uno to upload code into esp-01 and this is code i using to send random values from my esp chip to Adafruit Mqtt server - ****************************************************/ #include &...
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18 views

Arduino UNO and ESP8266-01 Wi-Fi cutting out after few seconds

I followed this tutorial: https://www.youtube.com/watch?v=2cjufbgOBYo My serial output in Arduino editor is this: AT AT AT AT AT AT AT AT+RST ATE0 AT+CWMODE=2 AT+CWDHCP=0,1 AT+CWSAP="RemoteXY","...
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1answer
35 views

Is it possible to connect many (20+) SPI sensors to an Arduino Mega?

I am making a system for measuring whether or not there is vacuum present in big steel containers. They are located up to 100 meters from the control cabinet. The question is, how many SPI sensors ...
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1answer
29 views

Problems with serial communication from Arduino to ESP8266

I've been trying to get an Arduino and ESP8266 to communicate with each other over serial. The ESP8266 uses the Serial class for communications, while the Arduino uses SoftwareSerial. The problem is ...
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0answers
23 views

Easy way to store Wi-Fi data on Arduino and ESP8266

I'm using Arduino UNO and ESP8266 for my application which has to share data over a public network. At the moment, I hard code the ssid and the password of my Wi-Fi network directly in the Arduino ...
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2answers
28 views

My ESP8266 web server is only displaying text, even after ensuring content type is text/HTML

So I just got my two ESP8266/ESP-12E WiFi development boards in the mail as I am trying to set up a few home automation devices in my house. I've gotten much further than I thought I would today, ...
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1answer
33 views

Using a water sensor with a NodeMCU make it less sensitive?

I'm trying to digitalRead from a water sensor (the one in the picture) using NodeMCU v3,when I try the sensor with an Arduino board it works fine, but when I try it with an ESP8266 NodeMCU v3 it ...
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6answers
24k views

How to connect Wi-Fi shield ESP-12E-ESP8266-UART-WIFI-Wireless-Shield with Arduino

I have bought this shield from ebay and now I don't know how to use it, ESP 12E ESP8266 UART WIFI Wireless Shield for Arduino UNO R3 Bouclier Sans filfr: There are no instructions in the box or ...
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23 views

Error Compiling for board adafruit feather huzzah esp8266

I am very new the Arduino language and IDE I am trying to implement some test code around the wifi101. H library. When I do so, I don't get an error on a specific line of code but an overall error of ...
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2answers
87 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
72 views

How to re-construct audio from series of analog integer input?

I'm trying to learn how to stream audio from the A0 pin of an ESP8266 NodeMCU board via UDP socket connection over to another windows computer that uses pyaudio to play it. At the moment, all I get ...
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4answers
4k views

ESP8266 sends webpage to client, but html codes appears in browser instead of webpage?

I am using ESP8266 with Arduino MEGA. ESP8266 is powered 3.3v via voltage divider, which is taking 5v from arduino and converting it down to 3.3v with the help of 5K and 10K resistors. AT commands ...
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1answer
23 views

Data received by Arduino from ESP8266 01 Module is not complete

I am sending some data from ESP8266 01 module to Arduino. But the data received by Arduino is not complete. Below are the images of the output from ESP8266 01 module and Arduino. Here is the ...
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1answer
59 views

ESP8266 won't receive messages after a while

There are 5 ESP8266s being used. Three act as a middleman (in AP_STA mode), one sends the message, and the last one receives the message after being passed over the middlemans (imagine it as a line, ...
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1answer
29 views

Program Arduino via UART from ESP8266 SPIFFS

I have built a custom board that has an ATmega328p connected to an ESP8266 module via UART. I am currently programming the ATmega328p using a USBtiny programmer via an SPI header. The ESP8266 module ...
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1answer
51 views

How to interface MPU9250 and NodeMcu?

I am trying to send MPU sensor data to Pubnub IOT platform but not able to do it since there is some unknown problem. There is no error in code but following issue pops up in com port:- It looks like ...
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3answers
23k views

error: espcomm_upload_mem failed when uploading a sketch

I am new to the whole arduino scene. I have connected my wifi module (esp8266 v01) to my arduino Uno like this: http://www.teomaragakis.com/hardware/electronics/how-to-connect-an-esp8266-to-an-...
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2answers
85 views

Parse a large json response with ESP8266

I'm doing a project where my Arduino uses an external ESP8266 wifi module (with AT firmware) to send http requests and receive server response. I'm trying to get an NBA scoreboard, and here's what my ...
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1answer
15 views

How to use the ESP32 WROOM GPIOS above #18 with arudino ide?

I am using the Arduino IDE version 1.8.8 I am trying to control an ESP32-wroom. The gpios for pins 16 and 17 are working. I have some relays on GPIO's 18 and 19 that I'd also like to be able to ...
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1answer
74 views

firebase arduino uno + esp8266

I am trying to make a project that can read data from usbsheild connected to arduino uno board then send them to firebase through esp8266. But the libraries of firebase and esp8266wifi that i found ...
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2answers
2k views

WiFi problem on Mega + WiFi R3 ATmega2560 + ESP8266

I've got 2 "Mega + WiFi R3 ATmega2560 + ESP8266" (link) and both have same issue when trying to use the ESP chip. Hope someone can point me toward something else to try in order to get them working ...
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0answers
22 views

MPU9250 and ESP8266 are not working together with Arduino Uno

I am trying to send IMU sensor data via WiFi using ESP8266. Both MPU9250 and ESP8266 worked individually with 3.3 V when tested, but are not working when interfaced together. I am not sure what the ...
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3answers
4k 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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0answers
27 views

send sensor data to more than one database with esp8266-01

I want to ask how to send data to more than one database when I managed to send data to the database, the data sent is not the result of sensors joining a single column, but I have created two columns ...
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0answers
25 views

Wire doesn't work between Uno & ESP32S & ESP8266

I think i've reached my limit. I can't get Wire to work between an Uno or ESP8266 or ESP32S. On the Uno I had them connected like SDA via Uno SDA -> ESP32 GPIO21 SCL via Uno SCL -> ESP32 GPIO22. I ...
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2answers
4k views

Can a ESP8266 and a HC-SR04 be friends?

I have some existing code that I've been using with an Uno and a HC-SR04. In order to make my project less expensive, I'm trying to port everything over to a ESP8266-01. The last hang up I've been ...
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1answer
27 views

Can't flash ESP8266 anymore (NodeMCU)

So I've been happily making away with these nodeMCU boards now for a while but I came across a strange issue when updating some code on my board.The problem was that I couldn't flash anymore with ...
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2answers
494 views

Error on Uploading Program to ESP8266 via Foca v2.2 (USB to TTL Adapter)

BACKGROUND To test the capability of uploading program to ESP8266, I use an empty program with only a blank setup function and a blank loop function. The result showed me that there are a ...
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0answers
51 views

Why is this Code not working with Esp8266 when it worked perfectly with Arduino Uno?

I'm making an attendance System using an RFID scanner, scanning RFID Card & saving Data in Excel. When I used this code with Arduino Uno (by changing #define SS_PIN 12 and#define RST_PIN 9) it ...
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0answers
24 views

OTA mDNS issues with ESP8266 and PlatformIO?

The common useage of the OTA library for this MCU is to have it connect to a network, and to then use a computer on that network to upload firmware across that network. Due to either issues with ...
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0answers
16 views

I can't send GPS data to server

I am trying to send gps location data every 3 seconds to mqtt server if it's updated but my device shows weird stack errors and resets. What i am missing? I am using tinygps++ and pubsubclient as ...
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0answers
29 views

Connect two ESP8266 using serial link

I am trying to build a gateway for ESP-NOW (https://github.com/HarringayMakerSpace/ESP-Now) and I would like to get help with connecting two esp8266 (nodemcu + esp01) with serial link (for use as ...
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0answers
38 views

Understanding flashing with bash in Ubuntu

I am following the instruction from this DIY tutorial to set up the firmware for my dust sensor on Arduino board (NodeMCU): https://luftdaten.info/en/construction-manual/#feinstaubsensor-konfiguration ...
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0answers
18 views

NodeMCU V3 - Troubleshooting basic TMP36 circuit

If I follow this example using my Arduino Uno https://learn.adafruit.com/tmp36-temperature-sensor/using-a-temp-sensor (using the 3.3V code example at the bottom of the page), I get reasonable ...
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1answer
13 views

Using ESP8266-01 via Arduino(no flash) without AT commands(using serial monitor)

I'm trying to build a smart Keychain using Arduino uno wifi(org, so Im using it like it's Arduino uno), ESP8266-01 And neo6m GPS device. My esp8266 wasn't new, and it came without AT firmware. I ...