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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Using or creating Wi-Fi Direct (P2P) connection on ESP8266

I want to make a Wi-Fi Direct connection with an android device using my ESP8266. According to ESP8266WiFi Documentation and ESP8266 datasheet, the board has a SoftAP mode which is I think what is ...
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How to listen to multiple server ports with ESP8266?

I'm using WeMos D1 R2. I'm trying to listen to both ports 1992 and 1993. This is my current code: #include WiFiServer server_1992(1992); WiFiServer server_1993(1993); void setup() { Serial....
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How do I interpret the esp8266 "boot mode" message?

Everytime the chips resets, we get the reason and the next boot mode. ets Jan 8 2013,rst cause:XXX, boot mode:(YYY,ZZZ) For XXX we can check the meaning here. For YYY and ZZZ I am not sure but I ...
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Converting between NEC and HEX values from IR receiver

I jacked one of the IR receivers from my LED strip and hooked it up to my ESP8266 NodeMCU (running Arduino code). I found a great library called IRremoteESP8266. With this library, I can basically ...
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ESP8266 and Arduino bidirectional streaming from and to a website

I was looking for some easy tutorial on bidirectional communication via ESP8266 connected to Arduino UNO. I want to send and receive strings from and to JQuery based website. However, I couldn't find ...
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Using both FastLED and Webserver without glitches possible?

I'm using an ESP8266 to control a short strip of WS2812 LEDs. I also want some way of remote Control so I'm looking into using a Web UI with the ESPAsyncWebServer library. However using that Webserver ...
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Uploading image to Google Drive with Arduino/ESP8266

I have a toucscreen tft connected to an ESP8266 the aim for which is to take a screeenshot (.bmp format) and upload to Google Drive. I have been following this tutorial. Where I am stuck in how to ...
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MAX30102 not working?

I have a project to find the pulse oximetry rate. I used MAX30102 and ESP8266 as shown in the first picture. Wiring GND ------> GND VIN ------> 3.3V SDA ------> D2 SCL ------> D1 Code I ...
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ESP8266 01 doesn't react after baud rate change

Hello guys I have my ESP8266 connected to my Arduino. Then I typed in AT in the serial monitor. It confirmed this command with OK. After that I typed in AT+UART=9600, 8, 1, 0, 0 which gave me the ...
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Arduino compatible ESP32 and ESP8266 board power consumption at sleep state

I have data on smaller modules with ESP32 and ESP8266, but can't find anything reliable pertaining to the whole board power consumption (current) with 12V input and microcontroller at low power or ...
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Connecting Arduino Uno's TX pin directly to Esp8266 esp-01

I am new to esp8266 esp-01 and trying to figure out how to use it, in many tutorials on internet, I have seen people have connected Arduino uno's TX pin directly to esp8266 esp-01 without any voltage ...
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ESP8266 + 4x TM1637 == possible?

I'm having trouble getting my NodeMCU connected to 4 x 4 Digit 7 Segment Displays. So far I've been able to connect 2 & get them to display things from the demo repository. However, after trying ...
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Getting a Wemos D1 Mini to work with a M1 Mac

The Wemos D1 mini won't show up on the new M1 Mac. I know it's related to the drivers but I just can't find a viable solution to the problem. Has anyone solved this?
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How to adjust Partition Scheme Wemos D1 mini pro?

I bought myself a WEMOS D1 mini PRO (16MB) for creating a quite large project. As I'm writing code, my memory is starting to grow. When I looked at the Flash size in Arduino IDE, the only options I ...
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Where to define web server callback functions so they can access server object? (ESP8266WebServer library)

I want my ESP8266-based device to create an accesspoint that allows the user to input their home ssid and password. There is a device object that holds most of the data defined elsewhere. I'm trying ...
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Not Able to communicate with ESP8266

I just bought an Esp8266(not the node MCU) and tried connecting it with Arduino without a USB to serial converter but in vain. I am a beginner and don't know what to do. It is not responding to AT ...
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GET/POST request via AT Commands

I am trying to send a simple GET/POST request to a dummy end point on https://requestbin.com/. I am using an ESP8266 module. I am using the arduino serial monitor to send these AT commands. I connect ...
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156 views

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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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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1 answer
237 views

Static ip for esp8266 based on gateway

I'm new to Arduino programming. I want to make my esp8266 get static IP based on gateway. I mean if gateway is 192.168.0.1 then it should get 192.168.0.15 as static IP. And if gateway is 192.168.1.1 ...
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377 views

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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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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NodeMCU ESP8266 Returns IP address, but cant open the web with IP address

I have used the below code with proper Wifi Address and password. The Nodemcu connects to WIfi, and displays IP address, But the IP address cannot be used to open a web page. It says "This site cant ...
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327 views

ESP8266 and Arduino, using i2s and the built in adc?

I've done some extensive googling but haven't found any kind of proper documentation. Is it possible to use i2s with the built-in ADC on an esp8266 to sample audio? And if so: any sample code on how ...
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Turning on controller with button and turning off with a timeout

I am making a device controlled by an ESP 8266 and am wanting to save power by having it power down when not in use. The desired behavior is for a momentary button press or vibration sensor activation ...
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2 votes
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662 views

error compiling for board node MCU 1.0

Arduino: 1.8.9 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Serial, 115200, 4M (3M SPIFFS)" In file included from C:\Users\Priyaranjan Tiwari\Documents\Arduino\007mcu_php\007mcu_php....
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2 votes
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If an Arduino goes to sleep, does the attached ESP also sleep?

I am using Arduino Uno + an attached ESP-01 (ESP8266). I want to save battery, so I made my Arduino get sleep & interrupt by a watchdog timer. But if the Arduino goes to sleep, does the attached ...
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ESP8266 Websockets problem

I am trying to set up a network of 4 esp8266 programmed via the Arduino IDE. The Network will have 1 server (esp8266 running in AP mode) and 3 clients (esp8266 running in STA mode). I would like to do ...
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2 votes
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144 views

My PIR sensor output changes but digitalread high all the time

This is my final project, I have to communicate with two wemos d1 mini by LAN. The problem is that when I read the state of the PIR sensor it is "HIGH" all the time, but when I connect the led light, ...
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MKR1010 serial communication

Is communication using tx/rx from an arduino to mkr1010 the same as any other serial communication? I ask because I can't find any tutorials or info on connecting an arduino to mkr1010, but there are ...
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Cannot POST to server. HTTP code -1. NodeMCU

I am trying to make a POST request with NodeMCU, but I get a HTTP status code -1. Code: #include <ESP8266HTTPClient.h> #include <ESP8266WiFi.h> #ifndef STASSID #define STASSID "Wifi" #...
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Can't POST data with Arduino and ESP8266

I'm having problems with my Arduino UNO and the ESP8266 module. I need to send values from Arduino to my PHP web page in this way: http://www.server.com/km/db.php?id=53 the ESP8266 module is working ...
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2 votes
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657 views

Cant get rid of Soft WDT reset using ESP8266

Im using ESP12E DevKit v2 (esp8266 wifi module) board for controlling relays and displaying DHT22 temp,humidity on web server. It runs smoothly but after while i always get a watchdog timer reset. (If ...
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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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339 views

ESP8266 based wifi IR Universal Remote for A/Cs

I have been working on a prototype for a wifi based universal remote controller and i have been using the IR-Remote library for the same. But i have a couple of questions which google couldn't help ...
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ESP8266 WiFi Module disconnects from WiFi itself

#define id "qwerty" #define password"123456789" int relayPin= 4; void setup() { Serial.begin(115200); Serial.println("AT"); pinMode(13, OUTPUT); pinMode(relayPin, OUTPUT); delay(3000); ...
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2 votes
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ESP8266 can't read parasitic DS18B20 temperature (reset during conversion, 85°C)

tl;dr at the end I was running two DS18B20+PAR temperature sensors without any problems for the last two years on an ESP-01 module running on 3.3V on GPIO 2 using a 4.7K pullup resistor. Now, ...
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Serve currently uploaded code from Arduino

I'm creating a project where multiple ESP8266 12-E's are connected together. I want to use ArduinoOTA with the HTTP option (described here) and I want to have one ESP be able to send its code to ...
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Reading +IPD response from serial.read() using Arduino UNO and ESP8266

I have a python server running on my PC and I am using an Arduino Uno (wifi enabled by a ESP8266 chip) as the client. I can make the the server and client communicate using AT commands as shown below: ...
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Adafruit Huzzah Feather not resetting and serial monitor garbage

Hi there, I have an Adafruit Huzzah Feather project laid out as you can see in the diagram above. Currently I am having trouble getting it to reliably reset and start the sketch. More often than ...
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Wake up ESP8266 with multiple GPIOs

I am building a ESP-07 based IOT device, that detects the status of 4 doors. The device must connect to WiFi and send an http request, when 1 of 4 doors is opened. I want to place a reed switch, for ...
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921 views

ESP8266WiFi client.print() strange response

I am using a NodeMCU, so ESP8266. I installed the core via the Boards Manager at the last version. My goal is to control a GoPro camera through WiFi. I am getting mad with these few lines of code: ...
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ESP-01 not running custom firmware

I have two esp-01 micro controllers that I'm trying to flash using the Arduino IDE but found some problems in the process. I followed step 1 of this tutorial to install all the dependencies to the IDE....
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WifiEsp client TIMEOUT when put on a loop

Hello I have been using the WifiEsp to send and receive data from Thingspeak. All is well until I put my http request on the Void Loop() section. My Goal: I want to receive data every loop not on ...
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Why isn't ESP8266 connecting to wifi when calling yield()?

I'm experimenting with ESP8266 and I want it to cycle through various states: LED on/off, WiFi on/off and measure the connection time, deep sleep. I wrote the following script, using millis() to ...
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ESP8266-01 system param error

I'm using esp8266-01 connected to arduino nano. Every time I tried to upload code to the esp8266 chip I get this error in the serial monitor: system param error 56 45 52 31 00 00 00 00 ff ff ff ...
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Digital Vibration sensor on NodeMCU ESP8266

First Post. I'm using a NodeMCU esp8266 connected to a digital vibration sensor. My project is to detect when a pager vibrates to then trigger through the maker channel of ifttt an outcome. I'm ...
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5k views

Can upload programs to ESP8266 with Arduino Nano but not run them

I am trying to use my Arduino Nano to program my Generic ESP-01 Module. I want to use the module to control an RGB LED Light Strip but am not having much success, only errors.... These are my ...
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2k views

ESP8266 library / function for IR remote control

I am using IRremoteESP8266 for reverse engineering Hitachi AX-M76E mini stereos IR controller. I want to read the signal that the remote sends and send the same hexas to the stereos with IR led. ...
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869 views

Make RFID Tag as a variable

I want to make RFID Tag as a variable, and push it to the web server. But I struggle to do the Serial.read function. Any solutions? Here is my code #include <ESP8266WiFi.h> #include <SPI....
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