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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Multiple void loops with ESP8266

I want to run multiple sketches on one sketch. I use the method of multiple void loops. It works but esp8266 take a lot of time to execute commands. void Setup() { setup1(); setup2(); } void ...
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Can't parse large json file

For a project I've to parse a big json file. Unfortunately it does not work as expected. Here is the json file: { "data1": "...
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ESP8266 /ESP12F use flash button as input without using loop()

I couldn't find a proper answer anywhere on internet. I want to use the FLASH button as input in the setup() function and do not use the loop() with deepsleep mode (this part comes later). I tried ...
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264 views

Can someone help me to change this code to u8g2

I would like to change this clock to u8g2. It works fine with the esp8266 and oled 128x64. I would start by including the u8g2 library with #include and all display. with u8g2. replace. What else ...
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368 views

Notoriously unstable ESP8266 MQTT-client

I am doing a project where an ESP8266 receives data from an Arduino Uno and publishes it via MQTT. After a random amount of time, it will stop sending data to my MQTT broker. It might be an hour, it ...
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client.connect() failing unless I ping my ESP

[EDIT] it seems like this has to do with my laptop's firewall settings rather than anything wrong with the ESP8266 [/EDIT] I have a webserver on my laptop. When I do this on my ESP8266 (after the ...
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114 views

Flame sensor and MQ2 sensor not working with Esp8266?

When ever flame is detected sms will be send this is what i am doing,but the flame and smoke sensor works awesome when they are tested seperately(Without Esp8266) when they are integrated with ...
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285 views

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

i dont have any idea about this problem. can anyone help me how to fix this? #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <ESP8266WebServer.h> #include <...
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In what mode does the Esp8266 and flame sensor code has to be executed?

I had executed Esp8266 code by changing the board to "ESP8266 Generic Board".I have also executed the Flame and smoke sensor by "Arduino Genuino/Uno".Now how should i integrate those two?Which board ...
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122 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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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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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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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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281 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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120 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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95 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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147 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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93 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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365 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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745 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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153 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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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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108 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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74 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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967 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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607 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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228 views

Trying to communicate data received with nRF24L01 module to API using ESP8266 in arduino UNO

I have been trying to push data into my API from Arduino UNO with ESP8266. The device connects to WiFi but fails in performing the data push after acquiring from remote sensor node with the nRF24L01 ...
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33 views

RF Rx with NodeMCU error

I am using RF Tx with Arduino Uno and Rx with NodeMCU. I use RF switch library. At the recipient side if I use an Arduino Uno MCU. I can receive the output, but with NodeMCU I have a blank serial ...
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2k views

Using SoftwareSerial on a Wemos D1 to get data from a GPS Shield

I am trying to use a Wemos D1 R2 to connect to my NEO-6M GPS module. I am able to make the module work fine with an Arduino UNO. I'm having significant trouble with the D1. Based upon other posts I ...
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30 views

ESP12e pin 13 won't set to output/won't work

I have an ESP12e and running a basic blink code on it. The problem is that GPIO13 of esp12e wont turn on. I have noticed that this has happened from time to time. Earlier I thought that the ESP was ...
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554 views

ESP8266 to send data to thingspeak while doing unblocked read on Serial.readString()

I have a requirement to get RFID data on Arduido UNO and send it to ESP8266 to be sent to ThingSpeak via the Wifi module. However, ESP8266 is also programmed to send Temperature and humidity data to ...
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489 views

HTTP PUT method on NodeMCU/ESP8266

I've been trying to send a put request from my esp8266 for a while not but I can't figure out why it doesn't work and there are barely any posts about put requests online I keep getting errors around ...
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1answer
53 views

Esp8266-01 AT Commands returns partially

Im trying to get html response from server via esp01 module when using the serial monitor in arduino studio everything works fine here is the serial monitor output AT+CIPSTART="TCP","aaaa.aaaa",...
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264 views

ESP-13 WiFi shield - “error: espcomm_upload_mem failed”

I am creating a web server with Arduino and a ESP-13 WiFi shield. The wiring is as following: Arduino UNO || ESP-13 WiFi shield 5V || .5V GND || GND TX || RX RX || ...
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What's the required voltage for ws2815?

I am working on ws2815 led strip with the esp8266 on arduino 1.6.6 fast led library.Using CD40109B level shifter to convert 3.3V of esp output to 12V .It's working fine upto 31 leds according to the ...
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110 views

ESP12F module not working as an access point

I have an ESP12F WiFi module and I need it to work in access point mode. I burned the example code to it using Arduino IDE and it worked at first. I could connect to the WiFi provided by it using my ...
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155 views

How to use ESP8266 with Google API for GPS as well as controlling Arduino pins

I am working on IoT based project and I want to control the device using mobile App. Everything works fine, I can switch the load and get the status back on mobile app, but I want to use my ESP8266 as ...
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53 views

LED turning on late

I am using an Arduino nano and an ESP8266. I have burnt an Arduino, but when I send a request to the Arduino LED, it takes some time to turn ON. Here is my code: #include <SoftwareSerial.h> ...
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1answer
338 views

Detect power interruption on NodeMCU

Im using a 5v 1A power supply and connected to VIN pin on the NodeMCU. I also use 18650 battery to keep NodeMCU running in case the power supply shuts off due to power interruption. I'm planning to ...
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1answer
109 views

Cannot get esp8266 - 12 wifi module to always read analogRead incoming voltage accurately

So I have and arduino uno that is firing an output on pin 8. This code is not in this file just to be clear. From there Im taking that output and using it to fire pin 0 on the wifi module. Im using ...
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74 views

Garbage output/ not running at start up nodemcu

I have a nodemcu acting as a thermostat home office. The wall heating element is controlled with a solid state relay on D2. If i have it connected, I cannot program the board from the arduino ide. I ...
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83 views

Sensors are not function with ESP8266 WeMos-D1R2

I attached all sensor into the Wemos-D1 for uploading the sensor data to the server. but when I upload the data to the server, it connects to the server but cannot save the data into the database and ...
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84 views

Testing a capacitor with a nodeMUC Lolin V3

Apparently it's possible to test the capacitance of a capacitor with an arduino. In this thread, someone tries to do the same on a NodeMCU but the conclusion is that it's enough to get the change in ...
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319 views

Using an OV7670, Arduino Uno, ESP8266 and SD card

I am planning to create a project which will take a picture with OV7670 and Arduino Uno with SD card and send it to server with ESP8266. is it possible to use Arduino Uno(it has only 2k RAM memory)?
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55 views

Esp8266 -12E v3

So I have this ESP 8266 v3 board that has a program. Running on it currently, it’s the example scan Network Program. No matter what program I send to it now I get a error complaining for board NodeMCU ...
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517 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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117 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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18 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
39 views

ESP8266-01S Stopped responding after second launch

Here's the code: #include <SoftwareSerial.h> #define RX 6 #define TX 5 String AP = "..."; String PASS = "..."; SoftwareSerial esp8266(RX,TX); void setup() { Serial.begin(9600); Serial....
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701 views

How to avoid electromagnetic interference on ESP32 input

I've realized a simple circuit like the following, in order to implement a rain gauge that I can access via HTTP: With the following sketch: #include <WebServer.h> #include <WiFi.h> #...

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