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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ESP8266 does not detect WiFi networks

I have an ESP8266-12E, I used it previously and it worked fine (approx 2 years ago) I can't seem to get it to detect WiFi networks or appear as an Access Point I can upload the blink sketch and the ...
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Can´t load a program into my ESP01 using an ArduinoUno

This is my problem, I´ve been trying to load a program(any program) into mi ESP01 and because I do not have the usb adapter, I decided to use my Arduino Uno to do the work. This is my first time ...
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55 views

Mega <> esp8266 comms sending baffling data

I have Wemos Mega-ESP8266 board. I have uploaded a simple WebSocket server on the ESP... #include <ESP8266WiFi.h> #include <WebSocketsServer.h> const char* ssid = "SKYNET"; const ...
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25 views

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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How to read high voltage (40-65v) from a Solar Battery bank

I would like to monitor the battery voltage of a 48v solar battery system. The expected voltage range is 40-65v. I have tried creating a voltage divider with 2 resistors but with all values I have ...
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62 views

Use Arduino to turn fan on / off

I have a simple fan. When I plug it to GND and Vin it spins. I'd like to have the ability to turn it on / off with code. Any example will do, as long as it gets it to spin. I have a NodeMCU board, if ...
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34 views

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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26 views

Trouble uploading code to ESP12 with CH340g

I have a programming circuit for the esp12(see attached) enter image description here I have produced a pcb using this circuit. Upon plugging the pcb into my pc via the micro usb, the pc immediately ...
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45 views

driving an stepper motor using esp8266

I have an stepper motor, and a stepper driver Uln2003a which is connected to an esp8266. the esp8266 is powered via usb, and the stepper motor is powered via the driver, which is then powered by an ...
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29 views

Can't connect my ESP-12F to WiFi with my Arduino Uno

Recently I bought this wifi adapter for my IOT projects that I connected to my arduino uno that seems to not working. I have tried with the arduino ESP8266WiFi library with RX connected to pin 0 and ...
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40 views

esp8266 deep sleep timer slightly inaccurate?

I'm making a door open timer using a hall sensor and have a wemos d1 mini that uses a deep sleep to sleep for 1 minute after checking the hall sensor state and printing the value on the serial port. I'...
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26 views

ESP8266 remapping or UART boot

I am trying to make an DFRobot Wifi Bee sleep periodically. The first run executes fine, but after the wakeup a lot of gibberish is shown in the serial monitor. I changed to baud rate to 74880 to see ...
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36 views

How would you add Arduino WiFi Module using I2C or serial interface?

I am new to Arduino prototyping. I bought an Arduino Automatic Smart Plant Watering Kit 2.0 thinking it was a shield to use with my Arduino Uno WIFI Rev 2. However, it turns out to be a specially ...
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67 views

Speed Control of Brushless DC Motor

I cannot understand the code of controlling the speed of brushless dc motor using ESP8266 WiFi Module. I found it in- https://ubidots.com/blog/speed-control-for-brushless-motors-with-an-esp8266-2/ ...
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23 views

ESP8266 NODEMCU V3, HOW TO USE AND CONTROL V3 OUTPUT POWER [closed]

this is my very first post in here so I apologise if I am not giving you all the information that I should. I am creating this topic to ask you help regarding how to control and use the v3 output of ...
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18 views

Serial monitor shows repeated CIPSEND and CIPCLOSE

I'm trying to build a heart rate monitor using ESP-01. The code compiles and uploads well but once uploaded, in the serial monitor it shows the following. It keeps repeat CIPSEND and CIPCLOSE over and ...
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27 views

ESP8266 accepts commands but returns nothing

I've been struggling for a couple of days now with the module ESP8266. I have tested it already with another Arduino (RX-RX / Tx-TX) and I could send some test commands and receive the corresponding ...
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44 views

How to compose an HTTP GET request URL with key/value parameters

I am experimenting with some code running on an ESP8266 board to retrieve data using a web API. I would like to store the host address and key/value parameters (API key etc.) of the GET request as ...
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47 views

Send file from ESP to server via FTP

I've a code which records sound to SD, then starts an FTP connection for a limited time. I want to make an automatic system which records then sends the sound file continuously. Now I'm recording ...
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28 views

ESP8266 http.get() issue due to wifi authentication failure

Facing a weird issue while reading data from esp8266. I am trying to read dynamic data from a demo text file on test server on same network in deep sleep mode. Case1: Joining new network I am using ...
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30 views

Using Arduino Motor Shield

I'm looking to create a blind controller and have set up the hardware and software as I think it should be. I had the software working fine using an IC motor driver, but as I am no great at soldering,...
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47 views

MQTT subscribe callback fails to be called in ESP8266 deepsleep mode

Refer to ESP8266 deep sleep and MQTT I executed the code in the given link. However i am not able to receive the subscribe message that are send from MQTT test broker(MQTT Lens) on the serial ...
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31 views

why sound appears between VCC and GND pins in esp8266 module?

When I use esp8266 as STATION mode and connect a speaker between VCC(3.3v) and GND pin a sound appears like "doop doop". what is this sound? I test this in version 01 and 12 of esp8266 module and this ...
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21 views

What firmware on ESP-WROOM 02 and how to change to AT firmware?

I just received a Wemos board with an ESP-WROOM 02 on it. I connected it via USB to my Windows PC and launched PuTTY. I set the baud rate to 74880 and the correct COM port. I pressed on the reset ...
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35 views

Nodemcu ESP12-E (ESP8266), Can I reprogramming when the UART pins are defined as GPIO?

I wonder if there may be any problems using the pins that the UART are using as GPIOs, if now I want to be able to reprogram the circuit? (Of course I will detach the ESP12-E from the mainboard before ...
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104 views

ESP8266 I2C datasheet pins not the same as several examples

According to espressif datasheet of the ESP8266 it uses MTMS (I2C_SCL) and GPIO2(I2C_SDA) for I2C. However in several examples I've seen the typically use is GPIO(4&5) or GPIO(0&4) to ...
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47 views

Serial monitor error message

I connected my ArduCam mini to es8266 board and opened serial monitor. Then this message appeared. It started to appear continuously. I used the code in examples "functions of ov2640". What does it ...
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36 views

Motor isnt spinning when using L298N motor controller

I have a L298 motor controller connected to a motor with a 6 volt power sources. the motor however isn't spinning any ideas I'm using a esp 8266 node mcu board. I would like to use pwm but for right ...
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42 views

PIR motion sensor (HC-SR501) false results with NodeMCU

I have a PIR sensor which I use to detect the motion and turn ON and OFF the lights on the basis of it. I have PIR connected with NodeMCU (ESP8266) based board. I find that sometimes it trigger ...
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57 views

How to get a list of IPs in a LAN using NodeMcu?

I'm going to create an IoT system. I use a Raspberry Pi as a MQTT broker and as a webserver. Every day, the Pi gets a new IP address, so I need to find its new IP address via ESP8266 to use this ...
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45 views

ESP8266 Bootloader Firmware (on the ESP8266)

It appears to me that there must be some sort of prepackaged firmware on ESP8266 modules that allows user firmware to be loaded via the Rx/Tx pins on the ESP8266. If that firmware is corrupted, the ...
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36 views

HUZZAH ESP-8266 (by ADAFRUIT): How to use with the ARDUINO R3

I have recently purchased a ESP-8266 HUZZAH by adafruit. I'm kind of new to the whole arduino concept. I would like to know how I would be able to utilise this breakout board with my Arduino to do ...
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25 views

Esp8266 Web based code and real button

0 I wrote a code in the Arduino IDE. With this code, i can control 4 leds on and off from the web page. In the web page 9 buttons. 2 buttons for led-1 on and off. 2 buttons for led-2 on and off. 2 ...
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57 views

Send data to API from Arduino with ESP8285 Strange Error

I have an Arduino with few sensors, and I want to send all of data to my API over ESP8285 what is connected to the wifi. Its almost working fine, except one thing. I have these AT commands: String ...
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227 views

Arduino-IDE “while (!Serial)”

I have a Question regarding Arduino IDE: Many old Arduino setup examples states that the Serial.begin() function always should begin with : Serial.begin(9600); // (or 115200) while (!Serial) { ...
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97 views

Convert byte* to int in Arduino

I am trying to convert byte* value to int here is how I have it. void mqttCallback(char* topic, byte* payload, unsigned int length) { String topicStr = topic; int* payload_value; int ...
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1answer
31 views

ESP8266 print DNS address (obtained via DHCP)

I've set up an Arduino Clone (Wemos D1 Mini) to get IP-information via DHCP. Everything works fine and I can print the information : Serial.print(WiFi.macAddress()); Serial.print(WiFI.localIP()); ...
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24 views

SR505 PIR sensor Time Delay Using Ticker Library NodeMCU

I am trying to make the value of PIR sensor value HIGH for certain time using code. SR505 have a default time delay of 8 seconds. But I want to increase it to 20 seconds. I am thinking of increasing ...
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47 views

NodeMCU (ESP8266) board controlled over shared hosting database

I have a NodeMCU (ESP8266) board that I want to control over the internet. I am trying to find a solution where I don't have to set up any configurations on my router like port forwarding. I came up ...
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30 views

Unable to interface using Softserial with ESP8266 and Arduino uno

I am trying to use a ESP8266 in an Arduino project, but I'm unable to get the basic Software serial interface working with it. I have the ESP connected to a secondary 3.3v power supply. When ...
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19 views

Why UDP does not work after analogRead() on esp8266-12N module? [duplicate]

Consider my loop() in Arduino be: void loop(){ for(int i = 0; i<100; i++){ Value[i] = analogRead(A0); delayMicroseconds(62); } //delay(2) //when I use this line esp8266 works properly ...
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1answer
15 views

Implementing sending from N and recieving from N with FreeRtos and RF24 radio module

I'm trying to make my first chip send data through a nrf24 radio pipe and the other listen to it. After the first data is received it should switch to transmit mode and itself transmit new data. The ...
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17 views

Arduino firebase issue code uploaded but no any responce on firebase

I have uploaded example code in Arduino for FirebaseDemo_esp8266. but not getting any reponce on firebase window. plzzz help me to fix this issue...
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22 views

nodeMCU - 2 loops at a time - one continuously and second every 10 seconds

i have nodeMCU v3(esp8266) so i need to make 2 checks 1 check is the pin D1 which needs to be done continuously and another check is web link check every 10 seconds, problem is coz when i put delay ...
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16 views

nodeMCU - when DC is active on pin the do this

i have a nodeMCU v3(esp8266) and what i want is: when i send DC 5v or 3v to a pin=D1 (idk if its possible to send 5v directly to pin) then to activate the D0 for 20Seconds like this: if (D1==Sends ...
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53 views

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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25 views

Is it possible to send data at 100Hz using Wifi bee ESP V1.0 to Mobile (Xamarin)?

Im currently using WifiBee ESP V1.0 and Lilypad Arduino as well as AD8232 for ECG. We are trying to send the data to mobile phone by connecting to PubNub.` if(Serial.available()>0){ str = Serial....
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17 views

RS256 JWT with Arduino

I am working on a project where I am implementing JSON web tokens to validate devices on a server. I have been unable to find many resources related to RS256 JWT with Arduino or similar devices. ...
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41 views

Problem interfacing both esp8266 and EM18 with Arduino Uno

I have connected esp8266 with Arduino Uno and programmed 8266 with Arduino IDE to send data to firebase over WiFi. Now I also want to interface EM18 RFID Reader with Arduino in order to read the RFID ...
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41 views

Reading contents of ESP8266 Flash from inside sketch

I am aware that there is a way to create a dump of the flash via esptool, but is there a way to read the contents of the sketch (just the sketch, not the full flash or SPIFFS) memory via the sketch ...