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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Unable to read Arduino+ESP8266 full get Response

Using below code I am able to invoke HTTP Get request, but I am not able to read full HTTP Response. Observing only output like( +IPD,0,141:HTTP/1.7. ). Please let me know how can I read full response?...
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How to easily invoke Simple REST Service trigerred using Arduino UNO + ESP8266 WIFI Shield programmed with AT command?

My Question is How to easily invoke Simple REST Service trigerred using Arduino UNO + ESP8266 WIFI Shield programmed with AT command? I am new to this Subject and gone through many tutorial over ...
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Why does my Wemos D1 Mini stops working while charging via solar?

I'm using an battery shield to recharge my battery. I want to use a solar panel, so I bought one (5V 240mA). I'm pretty sure, it won't recharge my battery fully, but that's not the point. I've ...
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Can I use an internal clock on Wemos D1 Mini?

I have a working Wemos D1 Mini setup measuring temperature and sending it over wifi to my server. Now I'm using a battery powered unit, and playing around with power consumption optimization and how ...
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39 views

WeMos D1 ESP-Wroom-02 Mother Board ESP8266 - where is reset pin for deep-sleep

This item was bought for battery use with deep sleep purposes. For doing so in ESP8266 reset pin must be connected to Gnd pin in order to wake up. This board lacks a reset on- board pin. Since spec ...
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How to prevent flickering relay upon waking from deep sleep using ESP01 board?

I have a cheap ESP01 relay module and am using it with ESPEasy. I soldered the GPIO pin 16 to RST to allow deep sleep and that all works great. However when the unit wakes up the relay flickers quite ...
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OLED display on I2C causes esp8266 to reset

I have connected two temp sensors and an OLED display to a NodeMCU using I2C. When the program reaches the instruction to print the measurements on the display the program crashes and NodeMCU resets ...
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ESP8266-01 WiFiEsp Timeout error

I am using WiFiEsp Library, ESP8266-01 Wifi Module, Arduino UNO and Arduino v.1.8.13. ESP Details: AT version:1.2.0.0. SDK version:1.5.4.1(39cb9a32) v1.0.0. The module is also in AT+CWMODE=1. My ...
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22 views

Cant upload arduino code when ESP8266-01 module is connected

I'm using this tutorial to connect my ESP8266-01 WiFi Module to Arduino UNO with Arduino IDE v. 1.8.13. It works and the module can connect to my WiFi. However, when I try to upload my code, it says: ...
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Esp8266 12E is printing random characters whenever I reset the board, not even uploaded a code

I have a nodemcu esp8266 12E board. It's working properly, but whenever I reset it, it prints random characters like ??I%^, even if hasn't a code uploaded in it.
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Calling a localhost php script from arduino

Is it possible to connect arduino uno to call a php script using ONLY an arduino uno board, and an esp8266-01 wifi module.? That is, I lack wifi shield such as node MCU. I just need the setup to call ...
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ESP8266-01 Wifi module + Wifi shield not present + ESP8266-01 libraries not working?

I have Arduino IDE v. 1.8.13. I bought an ESP8266-01 module which I want to use in my Arduino-UNO board to send fingerprint registration confirmation (ID) via HttpClient to a xampp server since I dont ...
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Node MCU pins are showing leaking current/voltage on checking with tester (the tester is glowing when touching to nodemcu pins) [closed]

I had hooked up a nodeMCU and 5V solid state relay module with an HLK PM-05 power supply module being fed through 230V supply. The circuit is working fine except the HLK PM05 module dc output side is ...
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Missing ACKs on I²C

I am using a GY-521 accelerometer as well as BMP280 pressure sensors via I²C on an ESP8266. When I analyze I²C data with the oscilloscope, I can see missing ACKs on both of them as shown in the ...
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ESP8266 HttpClient recursive connections to URL to send sensor data

I am developing a project based in Arduino Nano and 2 sensors. In this projects is very important the energy because of the prototype is going to be powered by batteries or solar power. In order to ...
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28 views

Flash esp8266 from SPIFFS filesystem

I'm searching for a way to flash an esp8266 programmatically, i.e, without user interaction (and especially without Arduino IDE)? Assuming I can put the program to be flashed on the SPIFFS filesystem, ...
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ESP01 wont boot when connected to the led strip

have a wierd bug behavior.. i have an ATX power supply witch powers an long WS2812B 5v strip witch is controlled by the https://www.aliexpress.com/item/4000766948879.html Esp 01 and the board... NOW ...
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22 views

I2C comunication, ESP->Nano on endTransmission no ACK fron nano

i am trying to communicate between ESP(master) and arduino nano(slave). This is only a prototype and all works fine. But i want to add multiple arduinos and therefor i need to detect if the arduino ...
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39 views

Error using Const char

I am trying to program an ESP01 module using an FTDI board using some code from Hisham Marzouk. "How to programming esp8266 module with FTDI". https://www.officialhrm.com/esp8266/how-to-...
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39 views

ESP8266 OTA update with different flash size settings?

I have an ESP8266 in a project. It's specifically this ESP8266 SMT Module - ESP-12F item. It's been working great with OTA, but I realized belatedly that I didn't change the flash settings when I ...
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Wemos D1 mini and JSN-SR04T-2.0: Type of power supply affects the sensor readings

Pretty similar to what is described here I have the strange problem that my sensor readings are affected by the type of power supply I use. Whenever I connect my D1 mini through USB with laptop ...
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I'm getting an error while uploading my code to esp8266 via an arduino (FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error)))

Arduino: 1.8.13 (Windows 10), Board: "Generic ESP8266 Module, 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), dtr (aka nodemcu), 26 MHz, 40MHz, DOUT (compatible)...
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How to install esp8266 library? [duplicate]

I've got an arduino Uno R3, and I'm using Linux Ubuntu. I've installed Arduino IDE, and I'm trying to install the Esp8266 wifi library. I'm following these instructions and these instructions as well.....
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How I can send data information without work WiFi to LCD?

Hi everyone I am beginning learn coding and the second language English. I have small project I use Arduino uno , esp8266 , dht11 , lcd I2C and use blynk app in my project I have the code and work ...
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Best way to control two HS-55 servos via NodeMCU

I am doing a project for a friend who would like to open his intercom via his mobile phone. For this two small buttons need to be pressed down (1 for opening the door and 1 for the indicating light), ...
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Two way communication with two NodeMCU V3 ESP8266 for Controlling LEDs (using buttons and PIR sensor) [duplicate]

I want to use ESP8266 via wifi connection and exchange data between them. My goal is to be able to press a button (or have a different input such as a PIR sensor) on the first ESP8266 which will light ...
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watchdog timer giving me fits on ESP8266, how to find relevant code from Serial output describing the RST?

I've written a pair of sketches for two NodeMCUs to implement a noise meter. The master MCU voltage samples off an opamp's output pin and periodically digests 500 samples at a time into an RMS-type ...
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How to control 2 micro magnetic actuators with esp12e

i want to control two micro magnetic actuators (just two coil where I want to flow current in +to- and-to+ each motor for wifi airplane) with esp12e Do I need an h-bridge like l293d ? Also I will be ...
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Error acquiring data on esp32 for geiger counter

I bought the same boards used in this video on Youtube (the componts are THIS geiger counter (that I am pretty sure its working, the tiks on the speacker are coerent) and THIS esp (I don't know if is ...
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Is there any way or command to do the double reset of the esp8266 through CODE(sketch)?

I just want to do the double reset of the ESP8266 through code (sketch) .Is there any command or function for this ?is it possible??
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Can I use a MCP23017 to connect multiple RC522 modules?

I want to connect multiple (exactly 64) RFID-RC522 modules to one Nodemcu ESP8266. I already know, that it is possible to connect multiple RC522's by just using different pins for the SDA pin, while ...
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esp32 http client response only 200 didn't receive the data after that

i am using esp32 as a client and using following example. So here i am getting header response only that is 200. I am not getting any response after that. here is the example #include <WiFi.h> #...
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ESP8266 NodeMCU 3v3 current for fingerprint sensor

From what i see that 3.3Vpin provide 3.3V and 400mA. The fingerprint module i use is AS608. Connecting the fingerprint module power pin to 3.3V of the nodemcu. From the datasheet it only can handle 3....
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ESP8266 malloc/calloc-related crashes (“segfaults”)

This is sort of the continuation of this problem. After getting hints that the problem I had were related to bad memory, I checked all of my heap-allocating code again and found a malloc that didn't ...
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ESP8266 constantly crashes in malloc-related “check_poison_neighbors(unsigned short)” when networking happens

My project involves a bunch of peripherals, but most importantly for this project, a request to an NTP time server is done using the standard NTPClient library. Suddenly, after modifying some ...
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ESP8266 CCLOCK Odd behavior

I'm trying to write some extremely fast code for the ESP8266, so I'm trying to figure out how to time things. I've discovered CCLOCK, a register that reflects the number of clock cycles since startup....
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Sending AT commands to Reyax RYLR890 LoRa modules via additional serial port not working

I am setting up a LoRa module (transmitter) with nodemcu (ESP8266). The module (Reyax RYLR896) accepts AT commands over serial interface. I created an additional serial port using pins D7 and D8 on ...
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43 views

Cannot send any UDP packets from ESP8266 Wemos D1

I am attempting to send sensor data from a battery-powered device using UDP. The goal is to send a datagram immediately after the wifi station awakes from sleep then immediately go back to sleep after ...
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33 views

Is it possible to send data from internet server to ESP8266 behind proxy or regular requests from ESP8266 are required?

It would be kind of push notification or something like that probably. I can first connect to server and send it any data for "registration"... I found many examples with websockets but all ...
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Trying to recover my TTL-Wifi

So I bought What I tought was a DOIT Wifi-TTL and after a few bad manipulations I wiped the firmware... That means the leds are not turning on anymore and I see no activity on it when I connect to it ...
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Serial Output on ESP8266 doesn't work on 2/3 of my boards

I have 3 NodeMCU 1.0 12E ESP8266 boards. Issues Two of them require me to unplug and replug in the boards every time I want to flash code, and nothing appears on the serial output with this simple ...
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ESP-01 does not run code after Deep Sleep

When using the deep sleep functionality on several ESP-01 boards, the boards require two resets in order to wake up properly (regardless of whether the resets are done by manually bridging the rst pin ...
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49 views

How to get data out of loop?

hi i wrote a code(i modified it actually, please forgive me, im in a mess please help me if you can) for my esp8266 to serial communicate with at tiny 85 ,it will monitor switch state and publish ...
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NodeMCU ESP8266-12E and GPS Neo 6M

I have wired my ESP-12E and my GPS according to the wiring provided in this link. However, no GPS led turned on or blinked. Additionnally to powering the GPS directly with the 3.3V supplied by the ESP,...
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ESP-NOW host not receiving data

I'm trying to set up a network like the following: |Host| <-------> |Node x 3| I want to have a two-way connection between a host and each node, but each node cannot communicate with other nodes....
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ESP8266httpUpdate library built-in led blinking time

I have been working with the ESP8266httpUpdate library for a while now, I want to change the frequency of the blinking built-in led of the esp8266, I couldn't figure out how this library is commanding ...
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53 views

Problems with detecting button digital state

I am trying to start an event after pressing and holding the FLASH built-in Nodemcu button for a specific time, I wrote two functions, one for debouncing and detecting the state, the other is to ...
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33 views

NodeMCU LUA ESP8266 12E Issues with Programming

I recently bought the NodeMCU ESP8266 to work on an embedded project, and for whatever reason, the board will only allow me to upload Arduino sketches when I unplug and replug in the board via the ...
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26 views

how to serially off leds in an esp running mqtt

hi im using at tiny 85 to monitor dc switches and to serial print with this code below to esp8266 with local broker to turn leds on and off but its only working through mqtt but not with physical ...
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ESP 8266/32 - How to avoid immediately turning Off the device with RST pin conencted?

I would like to ask how to avoid the turn of the ESP8266/32 in case the door switch will be in the state closed? I am solving the situation when the doors are opened, the device is booted from the ...

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