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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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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
40 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
74 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 ...
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45 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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25 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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1answer
28 views

Connecting NodeMCU through internet [closed]

I have a NodeMCU and a website (free website domain provided by http://www.hpage.com) and I have to send and receive some data (suppose a 8bit number) from the website to the NodeMCU via internet. The ...
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27 views

ESP8266 Server does not serve CSS file

It is the first time I try do this. I configured HTML file and it was served. I want to give style to my HTML form with internal or external CSS, but I can't. However, I used different tutorials I ...
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2answers
70 views

Recommendations for 24V to 5V AC/DC converter [closed]

I'm working on an ESP8266 thermostat that should be powered by the 24V AC from the furnace. I'm looking for a converter to 5V DC that would be small enough to fit in a smaller enclosure and not ...
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82 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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27 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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1answer
74 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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30 views

How to use official ThingSpeak library with Arduino and ESP8266 module [duplicate]

Well I am very new with Arduino. I want to read a data and send to ThingSpeak. Reading and sending data has no problem with AT comment at this page. But I have seen examples of official ThingSpeak ...
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2answers
34 views

Change one specific byte of an IP address

So if I have an IP address IP Address: 192.64.5.1, is it somehow possible to change a specific byte of that IP to like IP Address: 192.64.**6**.1 My idea is to change the IP Address into variables IP ...
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116 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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1answer
155 views

ESP8266 deep sleep and MQTT

I am working on a project were I am putting my board into deep sleep mode, and it wakes up with an interrupt from a sensor. When it wakes from deep sleep I would like to send a message to my MQTT ...
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2answers
114 views

What is the voltage between Vin & GND?

I have NodeMCU ESP8266N Lolin V3, my 5V relay is powered from Vin of the NodeMCU. The NodeMCU is powered from 5V USB. My difficulty is when I measure voltage between Vin & GND, it is of 1.9V, but ...
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1answer
30 views

Power Arduino Mega ESP85266

Is it possible to Power a Arduino Mega 2560 and a NodeMCU V2 ESP8266 ESP-12E from a single 9V Block? What would be the best solution? Can i power the ESP8266 directly via the Arduino Mega 5V output? ...
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1answer
84 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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1answer
85 views

Why is dtostrf() not working for this one value?

I'm building a weather station using an ESP32 and BME280. I'm feeding the data via MQTT and Python into a database that is then used to make a nice dashboard for the data. The MQTT message needs to ...
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1answer
49 views

NodeMCU burned, did I something fundamental wrong?

I have a NodeMCU where I connected a LED strip (WS2812b, which operates at 5V). NodeMCU is powered via USB 5V. The used power adapter can supply 2.5A max. I don't have a separate power supply for ...
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61 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
45 views

Forbidden characters in TCP/IP

I'm trying to send data from my ESP8266 to a NodeJS TCP server, the connection and basic charakters (48-90) are working fine, but if I use others like ASCII-Code (0,1,2,3...) I don't get any usefull ...
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1answer
79 views

Is not it possible to use more than 3 output pins in ESP8266 at the same time?

I'm trying to make a WiFi controlled Car from my old toy car which will be running on ESP8266. I'm using the L298N motor driver and have one motor for left-right control & other for forward-...
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0answers
25 views

Websocket not sending message on connection

WebSocket not able to send message when it connects. I am using ESP8266 board and arduinoWebSockets library. Here is the code I have for websocket event: void webSocketEvent(uint8_t num, WStype_t ...
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2answers
116 views

ESP8266 EEPROM seems not working, saved data are different when I try to read them

I'm working on project which require to save some data into the EEPROM. As I read online the ESP8266 has no real EEPROM, it use a section of FLASH just after the SPIFFS. Due to this read/write is ...
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0answers
63 views

Problem “Didn't find PN53x board” Arduino NFC Card Reader

i am using the elechouse PN532 RFID Module with an Wemos D1 mini in the Arduino IDE. I use the ISO1443a_uid example from the elechouse library. All works fine if i plug the USB Cable into the wemos ...
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1answer
30 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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1answer
67 views

ESP8266 TCP/IP communication

So I'm looking into having a TCP communication between 1 ESP8266 Chip (Station) and 2 ESP8266 (Clients) connected to that station. Every time I find a code including the TCP, they only include things ...
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1answer
52 views

How to publish on Pubnub with node mcu?

I have node mcu and i am trying to use the example code on github and pubnub blog to send a msg as an experiment but can't figure how to do it. I used 2 example as the reference - https://github.com/...
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1answer
27 views

Lowest latency triggering multiple Arduinos using NRF24L01+

I'm building a rig with multiple DSLR cameras. I need to synchronize the cameras to take a photos with lowest possible latency. The only constraint is we want the ability to address each camera ...
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1answer
38 views

Detect DS18B20 sensors and correctly assign them to relays

I'm relatively new to microcontroller programming, so please excuse me if my question is dumb. I've created a simple device that allows me to control 4 relays based on temperature. I bought four ...
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0answers
59 views

Fail using OTA - Network ports

I was using OTA to upload sketches to ESP ports I have ( around 10 ESPs). For some time now - I'm having some kind of a trouble I would like to share, since I've read some similar topics, but all didn'...
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1answer
92 views

How to find the MAC address using NodeMCU when connecting to WiFi?

I am new to using NodeMCU and IOT. I am testing the NodeMCU (ESP8266) so that I can connect with pubnub server. Have taken code from github but there is error saying 'mac was not declared in this ...
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0answers
80 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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1answer
102 views

About Wemos D1 WiFi [closed]

I bought the Wemos D1 WiFi and I am wondering how to operate this. So, inside the Arduino IDE, I downloaded ESP8266 boards, I see WeMos D1 mini, WeMos D1 R1, and WeMos mini Pro/Lite. Why in the world ...
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1answer
44 views

Arduino IDE / Specified folder/zip file does not contain a valid library

I trying to add library here but it doesn't seem to work https://github.com/esp8266/Arduino This happens "Specified folder/zip file does not contain a valid library" This problem make me no longer ...
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1answer
30 views

ESP-8266 stopped working due to possibly faulty perfboard layout

I have been following this tutorial to set up my ESP8266. I have also recreated on a perfboard the circuit provided in the tutorial, and I intend to use this perfboard circuit in my project. The ...
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0answers
88 views

JPEG/PNG issues with ESP8266 + Spiffy

I am using a Huzzah ESP2866 with Arduino IDE. I am trying to upload images using html + Spiffy, however the broken image logo keeps appearing. The text works fine. I am using code from here: The ...
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0answers
84 views

Extracting SPIFFS functionality to library on Arduino/ESP32 using PlatformIO

I am trying to make the C/C++ code I am writing a bit more modular (hopefully eventually unit testing it), but I am not familiar with C/C++ so after the refactoring the code does not compile any more. ...
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1answer
47 views

How to handle concurrent HTTP request when using interrupt

I'm trying to make a door sensor with a reed switch. Each time the there is a change, the ESP8266 sends an HTTP request to web service. Unfortunately, the ESP8266 serial monitor dumps a huge stack ...
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0answers
189 views

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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59 views

ESP8266 client.connect() generates a memory leak [duplicate]

I have an ESP8266 that has to run 24/7, it sends some data to server every our, everything works fine for about 2-3 days after that it crashes. Sometimes it resets sometimes it freezes. I got to the ...
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49 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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1answer
266 views

Deep Sleep NodeMCU with Door Sensor

I have a very simple code of door sensor (magnetic) which gives results in 1 & 0 format. But I want to run the NodeMCU only when a door is open or close. Rest of time I want to keep it in deep ...
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1answer
72 views

5V 10A 4 channel relay to 2 lights15W light in series in 220V AC supply

I am trying to setup my first relay module with live environment. I have attached the relay module image below. Which I am using to control 4 devices in my switch board as follows: Fan (working ...
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0answers
49 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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2answers
111 views

Calculate the Li-Po Battery Level in ESP-Wroom-02

I am very new to micro controller and circuits. I am not at all with this field. But trying to create a home project where I have a device image attached below. This is 18650 Lipo battery powered ...
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41 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> ...