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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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23 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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22 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
22 views

Compare incoming message from ESP8266 [duplicate]

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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25 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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1answer
17 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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19 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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13 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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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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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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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
36 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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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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1answer
51 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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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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0answers
25 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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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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2answers
29 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
52 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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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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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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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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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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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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52 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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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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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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31 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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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
14 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 ...
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39 views

Control Fan Speed Using ESP8266

Hello i am using ESP8266 to control my 220v AC ceiling fan. I am able to do that easily with a 5v 10A relay module. But i want to know is there any module to control the fan speed as well? i have ...
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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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70 views

Can I use ESP8266 and OV7670 to video stream on a web?

OV7670 image sensor, small volume, low operating voltage, providing all functions of a single chip of VGA camera and image processor. so I am using and ESP8266 to connect to internet and stream the ...
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24 views

Real-time Pub/Sub thru MQTT between JoyStick and OnBoard Drive units [both ESP8266] - Connection issues

I looked around for solutions to my issue by searching on the forum and elsewhere and haven't seen similar issues - (https://arduino.stackexchange.com/search?page=2&tab=Relevance&q=MQTT%...
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29 views

How to speak from a client to another client over a Server - ESP8266?

In the last few days, a problem kept me busy. I tried to communicate from a client to another client over a server, like that: Client1 -> Server -> Client2 Client1 sends a small message (like the ...
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22 views

Secure connection with ESP8266 and socket connection

I want my system to stay connected 100% of the time. I'm using a TCP Socket connection on ESP8266. So, I created a test Sketch like this below (and a NodeJS server app). Everything works fine, that is,...
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2answers
86 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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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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36 views

Arduino ESP8266 ESP-01S GET command

Looking for some help on this please. It is a little long winded, but the point of it is I cannot retrieve a string response via my ESP8266 ESP-01S. I connect my ESP to my Ardiuno using ...
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2answers
90 views

ESP-01 not waking correctly up after deep sleep

I have an ESP-01 that I want to measure pool temperature with. It will send the data over MQTT to the broker. I have connected RST to GPIO16 so I can use the deep sleep functionality. Currenctly I am ...
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47 views

ESP8266 MQTT periodically disconnecting

I use an MQTT to communicate with an ESP8266. I'm using cloudmqtt.com and PubSubClient. Sometimes the ESP disconnects from the MQTT and reconnects. I checked the log from cloud and I got this data ...
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36 views

Serial Port not recognized by Arduino IDE

I’m attempting to connect with a Adafruit Huzzah Feather ESP8266 board. I’m running a 2018 mbp with Mojave. I loaded the Silabs driver (CP210) to connect with the onboard UART on Huzzah board. I got ...
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1answer
38 views

ESP8266 Flash - Maximize SPIFFS size

the board i use has 1MB Flash Size. My program however downloads 512K+ of data for processing. Arduino Options i see are: Ideally i would like to use 1MB of SPIFFS, is this even possible? I don't ...
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1answer
72 views

Transmit/Receive data Nodemcu(V3) + Bluetooth Module HC-05

I am trying to communicate with the HC-05 Bluetooth module for quite long time now, but with no success. I am using the Nodemcu(V3) ESP8266 module. I connect the HC-05 to Nodemcu in following ...
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1answer
46 views

Wemos D1 mini not being shown when connected to macbook [closed]

I have multiple Wemos d1 mini lying around, but can't seem to get them connected to my macbook, to they do not show up in my /dev/tty? I tried updating the driver, both using home-brew and installing ...