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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11 views

how to talk esp32 ip local and server in same project [closed]

i want to talk remote control application in mobile with esp32 local and in same project i want to talk smart home with Firebase public how do this
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41 views

No SPIFFS only OTA in NodeMCU ESP8266

I have a NodeMCU ESP8266 ESP-12E and I tried uploading a file thru the SPIFFS. I am not sure why I see OTA instead of the SPIFFS? Is there a configuration that I missed?
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voltage regulator

This may not be the best pace to ask this but I have to use a 3.3v regulator with this esp12 . For that I have selected this regulator 3,3v regulator and in the discribtion it is saying to use two ...
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26 views

Why Windows 10 does not see Nodemcu device?

I am using a Windows 10 laptop. Behind the nodemcu it says that download CH340G driver. I already had arduino ide and the esp libraries were already installed because i was using a esp8266 01 device ...
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50 views

analogWrite(PIN, 1023) <> digitalWrite(PIN, HIGH)

This question is very similar to this one. I'm using an ESP8266 for which the maximum analogWrite value is 1023 rather than 255 for some other Arduino boards, but I believe the principal is just the ...
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Communication between two slaves via single SPI bus

I am trying to control both RC522 and lcd st7920 (128x64) via a single SPI bus on the NodeMCU esp8266. I am using Arduino core for my esp8266. Now in this portion of the code, I only want to display ...
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37 views

ESP-NOW with esp32 and esp8266

I want to use ESP-NOW with esp32 and esp8266. The esp32 will mostly send data to esp8266.I was not able to find any good tutorial on YouTube to achieve this. The only videos I found was for either ...
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42 views

Hijack analogue doorbell chime to trigger nodemcu

I have an oldskool doorbell chime. What i would like to do is whenever there's a voltage flowing through the doorbell also trigger an HTTP call, which will trigger some smart home automations. I have ...
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26 views

ESP8266 RF Calibration

As an off-Topic to my main question, regarding Robodyn's Uno+Wifi - it seems that Wifi does not work ( fail to connect and fail find any network ). Juraj advised to use External Antenna ( did not work ...
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1answer
26 views

I want to make mesh network with nodemcu (esp8266)

in this all the nodemcu are in both mode receiving and transmitting, if i made 6 nodemcu connected with each other as mesh network to control home appliances, using mac address. suggest how i will ...
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46 views

RobotDyn's UNO+WiFi R3 ATmega328P+ESP8266, 32Mb flash, USB-TTL CH340G, Micro-USB

I'm trying to use this board ([as shown on manufacturer's site][1] I managed connecting each one and uploading a minimal sketch. I conducted a test ( using appropriate sketch on each one and a wire ...
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Can't upload sketches or flash Nodemcu 1.0 12E (CP2102) but have drivers and responds to RST on Serial monitor

I've been trying to get my nodemcu working for months and tried countless online references but none worked. I'm using the Arduino IDE to upload sketches and always get the error "Timed out ...
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UltraSonic Sensor wirh ESP-01 Standalone

I'm trying to build a cheap device to measure water level in a tank using HC-SR04 sensor and ESP-01 which send the data to MQTT topic. I used the same code with ESP-E12 which works just fine. As I'm ...
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Wemos D1 / Witty Cloud D8 doesn't behave as expected

When using D8 in the code doesn't work, nothing happens, but replacing D8 with 15 works like a charm. And to test this I created the code below. I know that D8 has worked earlier, but I don't remember ...
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Conversion from string to char array

I know this is Arduino Forum but I think this question is related to programming, I am using ESP8266 for the project. I need to convert the string incoming on the serial through UART lines and ...
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RA-01 Lora Radio not turning off

am trying to completly turn off ra-01 radio and esp8266 and turn it on by external trigger but i have issues getting the lora radio to turn off #include <LoRa.h> #include <ESP8266WiFi.h> ...
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NodeMcu 1.0 keeps resetting automatically after random time [duplicate]

I want to show some digits in a 3x3 p10 red led panel where the number will come from the cloud and the number keeps updating. For this, I have used esp8266 based Nodemcu. I have used WiFi Manager ...
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ESP-12e - RX/TX pins flickering on boot when used as GPIO pins

I am using ESP-12e as a controller for my garden lights. I am using pins 1 (TX), 3 (RX) and 5 as an analog output (PWM signal with mosfets) for three separate light sets. ESP is powered on when wall ...
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73 views

Is 1MB flash enough for OTA upload in ESP-01?

I'am asking this question, because in my ESP-01 OTA upload always fail. In fact update won't even start. When update was triggered esp wifi led(build in blue) indicates "working" , but after ...
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51 views

Programming ESP8266 to avoid random exceptions?

Below is the code that I have done on Lolin Wemos D1 R2 and mini it works fine but it throws exceptions every time, I tried understanding my problem by reading this: NodeMCU 1.0 - Exception 9 `Fatal ...
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43 views

Simple wifi scan networks doesn't work on ESP-01

I can't figure out why, but my very simple wifi scan code doesn't work on two pieces of ESP-01. At first I thought, about bad or burn out MCU, but none of my two ESP-01 and can not find nearby wifi. ...
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74 views

ESP8266 WiFi Not Connecting to Internet Without Static IP

I am seeing some very strange behavior with my ESP8266. When I connect it to the WiFi for the first couple of times I am not seeing any issues and the ESP8266 connects just fine. But after an ...
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41 views

NodeMcu 1.0 resets automatically after sometime

I want to show some digits in a 3x3 p10 red led pannel where the number will come from the cloud and the number keeps updating. For this I have used esp8266 based Nodemcu. I have used WiFi Manager ...
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1answer
30 views

Wiring up an ESP 01 to Nano

I've been at this for over a week now and still cant get things working. Im attempting to wire up an ESP-01 chip to a Nano to send AT commands over Serial. I've followed many different tutorials, but ...
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102 views

ESP8266 always resetting after 65 second of running

I have a simple code where ESP8266 is asking MySQL database about actual state of LED (whether 1 or 0) and when DB has 1 ESP8266 turns LED on... But my problem is after 65-66 seconds of server running ...
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51 views

Controlling smart bulb with ESP8266

I want to control a smart light bulb (something like this: https://www.amazon.com/MagicLight-Required-Multicolor-Equivalent-Compatible/dp/B07VQLZBNW) with ESP8266. Is there any library for that? ...
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Need PPM out of MQ4 sensor

I'm using this working library to extract H2 & Alcohol in PPM from sensors. UPDATE I read the readme file and used the example shown. But this gives me an error. This is the code: //Include the ...
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Can't send Twilio SMS using Nodemcu esp8266

I am using Twilio for sending SMS in my project. I am measuring temperatures and if the temperature is too high, an SMS is sent. In my code I also have a read and a push to Firebase Realtime Database. ...
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23 views

How to wait from ESP-01 response with Arduino SoftwareSerial

I have an arduino project that connects with the ESP-01 thru serial. The ESP8266 ESP-01 calls some service so it takes sometimes to return values. How do I properly wait for the ESP-01 to return ...
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41 views

I can't see any readings from my pulsesensor what can I do?

I have been using NodeMcu board for my project with a pulse sensor, DH11 sensor, and temperature sensor. Everything has worked well in spite of the pulse sensor. It doesn't show any readings that ...
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ESP8266 with RTC DS1307 shield - WS2818B shield won't blink - I2C issue?

Dear Ladies and Gentlemen, I'd like to let a LED blink base on the time of the day. So I took Wemos D1 mini and a WS2818B shield and a RTC DS107 Shield for the before mentioned ESP8266 model. Based on ...
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Building your own ESP8266 development board

I was wondering if someone could help me out? I have been looking for a project that would test my existing skills and force me to learn new ones, and I thought that trying to build my own ESP8266 ...
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42 views

Can SoftwareSerial be used in an ESP01

I am using ESP01 as a microcontroller that retrieves information from Firebase and sends them over serial to an Arduino Uno for other uses. I am not using NODEMcu since it has few analog pins and ...
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How to determine what resistor value to use for LED strip

I'm trying to use an ESP8266 powered by my computer through USB cable to control a WS2812B LED strip. I've read online that you're supposed to put a resistor before the data channel to help prevent ...
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1answer
55 views

Why we are using client.flush() in the program code ,when we connect Esp8266 with internet or web server?

I am using Esp8266 Wifi modular (12-E) for controlling a led through the access of wifi/webserver. I have written code in Arduino ide taking various references from the google.In the code, I didn't ...
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ESP8266 NodeMCU running out of heap

I'm trying to create SMS alarm using Twilio, Firebase and Arduino IDE. Using sensors I am measuring the temperature. If the temperature is higher than a specified value (ESP reads that value from ...
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1answer
14 views

AT firmware upgrade in ESP-01 using Arduino UNO R3

I need to upgrade the AT firmware in ESP-01 by using Arduino UNO R3 serial interface. Do I need to remove the Microcontroller Chip from the DIP socket before burning firmware? Does it going to affect ...
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23 views

Monitor two baud rates

I am using different codes which set different values of baud rate through the Serial.begin() function. I have an Uno using Serial.begin(9600) connected to an ESP8266 ESP-01 module SoftwareSerial ...
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46 views

ESP-01 wakes up from deep sleep and then hangs

I have found a number of other posts from people with the same problem but I can't find an answer. I have a small batch of ESP-01 boards, sold by Inland, and I wish to use deep sleep mode on them. I ...
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41 views

Conneecting Arduino UNO to internet

I trying to connect my arduino uno to internet. I'm using the following schematic: and using the following code to just to check if wifi is connected or not. #include <ESP8266WiFi.h> // Set ...
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44 views

8266 analogRead(A0) always 1024

dear member. I have 4 ESP-12 averything OK but one chip behave weird. always return 1024 on analogRead(A0); once use ADC_MODE(ADC_VCC) and reflash using ADC_MODE(ADC_TOUT); and never back to normal, ...
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31 views

Cannot read from DS3231

I'm having issues with a DS3231 RTC connected to an ESP8266. I can write to it to set the time (Wire.write returns 1), but anytime I try to read from it, Wire.requestFrom always returns 0. I've tested ...
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65 views

RDM6300 library not working on ESP8266

I have a RDM6300 RFID module which I am trying to connect to an ESP8266 by using rdm6300.h library. I had it all up an running all along with other components but we had connected to the ESP8266 but ...
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42 views

Using Javascript XHR to upload a file to the ESP8266 fails

In the past, I was experimenting with a method of uploading files to the ESP8266 using the stock ESP8266WebServer class as the backend. The frontend is embedded in the firmware, and it runs offline, ...
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Trigger ESP8266 reset pin on broken connection

I have an ESP8266 which I wish to place in deep sleep until a reed switch senses a door being opened. The ESP8266 is woken from deep sleep by briefly raising the RESET pin high. In my original design, ...
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Help using an Arduino as as an FTDI with a ESP8266 carrier shield to see an AT response

I have a Duinopeak shield that lets you plug on an ESP-01 and provides a 5V-3.3V regulator and level shifting for the Tx and Rx pins. I cannot get it to work with a setup that has worked with every ...
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40 views

Connect My Soft AP to Internet Router

I have established a Soft Access point with one of my ESP8266 and a client with another. Now, I'm trying to connect that AP to my home router to be able to access internet and serve some data to ...
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Arduino long message is cutoff in serial.read [duplicate]

My setup is like this, I have an arduino and an esp8266 esp-01 connected thru serial. I have programmed my esp8266 esp-01 to read from a JSON Source and I am returning a sample json like this. { &...
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35 views

Designing Class Based Code on ESP32-8266

I have some questions about modular embedded systems codes and its usage. I am building an IoT Systems with esp32 now. To learn professional approaches for embedded systems, I have split codes to ...
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51 views

Unable to allocate memory

I'm trying to send a SMS and read data from Firebase with my NodeMCU Amica V2. The code works fine when I either only send a SMS or only read data from Firebase. However, when I combine this two ...

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