Questions tagged [wifi]

Wi-Fi is a trademark of the Wi-Fi Alliance. A Wi-Fi enabled device such as a personal computer, video game console, smartphone, or digital audio player can connect to the Internet when within range of a wireless network connected to the Internet.

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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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ESP32 softAP SSID not const

I would like to be able to set the wifi SSID in the setup(), so I can customize it based on the MAC address or something similar. (avoiding to ESP's with the same code having the same SSID). However ...
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How are the different sleep modes used for esp8266?

I am currently trying to power my esp8266 with a battery, but I want to decrease the power consumption (current mostly). I understand there are different sleep modes, but I do not understand what can ...
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77 views

I want to stream audio from an Arduino to a device on the wifi

I only started learning Arduino recently. This is my first project. So the idea for the project is that there will be an Arduino board(Ideally an Uno but I don't know if another board would be better) ...
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19 views

ESP8266 WiFiEspClient Disconnect 3 with GPS

I have recovered an old sketch (2 years ago) in which I used 2 DHT22 sensors and sent the values to an web app to store in database. The sketch works fine with a ES8266 module connected to an arduino ...
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28 views

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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39 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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14 views

Adafruit IO + Esp-Now

So i am using adafruit io and esp-now on an esp32 to recieve voice commands from the internet and sensor values from another esp32. Independently, they both work quite fast but together the esp-now ...
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38 views

Send only one packet from one ESP32 to another ESP32 without acknowledgment

I have a network consisting 10 slaves and one master. I am using ESP-NOW to send the messages between the nodes. All of the nodes are within close proximity. I do NOT need a mesh network to reach all ...
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36 views

Connecting ESP8266 to website

I would like to control a relay using Wemos D! R1 via a website from anywhere. I managed to control it using local web server and now would like to step it up further. I'm using the following code ...
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Is WiFi traffic encrypted on ESP32?

I am using the ESP32 in soft access point mode. In other words I specify my wifi username and password on the ESP32 and I am able to connect to it from my phone. So I am not using any router or ...
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1answer
109 views

ESP32 open “captive portal” on connected

I am using the default example SimpleWiFiServer that comes as an example from the ESP32: #include <WiFi.h> #include <WiFiClient.h> #include <WiFiAP.h> #define LED_BUILTIN 2 // Set ...
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2answers
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Controling 5V relay with Wemos D1 R1

I would like to control a 5V relay with Wemos D1 R1 module through webserver. I'm using the following modules: Tongling 5vdc Relay Wemos D1 R1 I'm using the following schematic: and here is the ...
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Is Arduino Mega Hackable Over The Air

After reviewing similar topics I've decided to ask this question below in the Security Stackexchange forum about 11 days ago. https://security.stackexchange.com/questions/235423/is-arduino-mega-...
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Why is their need of response time needed in esp8266 AT commands?

I am writing an AT commands firmware for esp8266 via connecting it to atmega2560. Now the question is how will I come to know the response time for AT commands for writing its firmware to read the ...
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1answer
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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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51 views

TCP client readStringUntil only when data exists

I have the attached script that reads data from a socket server (it is PHP at the server end). My problem (I think) is that the readStringUntil() needs a test above it, so that it "reads up to \r&...
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38 views

How to Set RTC in ES32 using NTP server?

I am working on ESP32 And want to set RTC from the NTP server. How can I get epoch value I have done this thing on CC3200 launchpad and used an NTP server library to obtain epoch value.
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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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1answer
38 views

Latency in Websocket

I am using Websocket, for a communication from my mobile phone to a NodeMCU, and transmitting 4 channel, data, through 4 different Websocket Ports. the NodeMCU control code is here: // ============ By ...
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19 views

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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1answer
87 views

ESP32 - `Brownout detector was triggered ` upon Wifi begin

I'm Using an ESP32 - NodeMCU. One of the MCU's is acting weird upon boot, while at start I thought it was something to do with its sleep cycle. But, it seems that even on a minimal code as shown below,...
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1answer
57 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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2answers
54 views

Sending arduino sensor data via WiFi to a MySQL server

I'm aware this question has probably been asked many times but I'm pulling my hair out. I'm trying to get sensor data from an arduino to a MySQL server. I've checked the apache access log and the ...
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1answer
22 views

possible to preform VIO from two cameras/imu's on a dual-core esp32?

Like the title says, I want to take in the synchronised data from two NXP breakout boards and two Ueye 1220LE Cameras, and use VIO to fuse their data and get positions for both setups. Alot of people ...
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27 views

WIFI Bee ESP8266, MySQL and PHP

I am trying to update a db table using a WIFI Bee. For the life of me, I can't figure out how to connect to and program the WiFi Bee ESP card. I've looked on DFRobot's website and other websites to ...
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22 views

CIPSEND Shows 404 error using aeduino + esp8266+01

I am trying to save data in the data base with the get method. my url works fine when used with browser but when tried with esp shows page not found expection. Arduino Code SoftwareSerial ESP8266(...
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3answers
118 views

Can I get around extremely long time to setup WIFI connection WPA2 Personal?

I'm using the Arduino Wifi Nina Library to connect an Arduino Uno Wifi Rev2 to wifi and then using the Arduino HTTP Client library to make HTTP post calls to the internet. To connect the Arduino to ...
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1answer
36 views

what is causing my esp8266 setup function to reinitialise?

Here is code I have written: #include <stdio.h> #include <ESP8266WebServer.h> #define MAX_WIFI_INIT_RETRY 50 #define WIFI_RETRY_DELAY 500 const char* wifi_ssid = "ssid"; const char* ...
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55 views

ESP8266-01 & Arduino Uno Problem

I am having a problem when I want to run code like this on a Arduino Uno with esp8266-01. It's not working. In serial monitor nothing about esp. #include <SoftwareSerial.h> SoftwareSerial ...
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1answer
40 views

Print connection password typed by user on NodeMCU Lua ESP8266 ESP-12E

I want to make a WiFi Access point created with the ESP8266. Let's say that the SSID is 'net_work' and the password is '12345678'. When a client tries to connect with a wrong password, I want to ...
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1answer
30 views

How to connect multiple NodeMCUs and 1 PC over wifi and have PC control NodeMCUs? [duplicate]

I am trying to design a laser tag system using multiple NodeMCUs in the guns. I am trying to figure out how to connect and control them over WiFi. I also need a computer connected that will control ...
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2answers
43 views

Getting external data to the Arduino

I have a new Uno R3, it's pretty cool and I've enjoyed playing with it. Now I want to build a couple of things: 1) a market price LCD tracker. 2) a servo motor type thing to open my electric gate. ...
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1answer
41 views

Arduino Nano IoT 33 Char Array size constraints

I would like to save data that I am receiving from API calls in a char array. The problem is the data is around 80KB however my Arduino IoT 33 has 32KB of memory. It will save data in a char array ...
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2answers
661 views

Why doesn't OTA work with the Ai-Thinker ESP32-CAM board?

I have working code on an Ai-Thinker ESP32-CAM board, programming over serial. I would like to reprogram using OTA, but adding in the functionality from the BasicOTA sketch (which I have done on ...
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1answer
34 views

ESP8266 to ESP8266 via home rooter

I would like to ask how to build a star topology network with several ESP8266s, pc and a home wifi router? I would like to connect my computer (as a client) and ESP8266s (as clients) together via a ...
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2answers
37 views

Several ESP8266 in wifi network should share information

I am currently working on a project for my home where several ESP8266 (each with a relay) control lights. I have developed an android for this where I find the ESP8266s via mdns but the problem is ...
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1answer
86 views

Problem sending strings to another ESP

I am having some problems with retrieving data from another esp. I have two esp8266, one is the access point which has a nextion lcd hooked up to it. The access point reads button presses from the lcd ...
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1answer
93 views

Serial read SSID and PASSWORD WiFI connection failed in ESP32

Trying to get Wifi SSID and password dynamically from serial monitor and connecting to WiFi, tried the below program, but wifi is always in Connecting state only, it is not getting connected after ...
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1answer
60 views

NodeMCU Server side cannot send things to client side - multiple clients attached

I technically need your help, when I am working on my project, I found out that my server-side cannot send data to the client-side, my server-side is made with WiFiServer(80) so it is when my client-...
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1answer
124 views

ESP8266, I am trying to establish a SoftAP and I cant seem to get the WiFilocalIP function to give me my IP

I am just trying to establish a server and it seems that I can't get the serial monitor to read the local IP of my device and my Client can't establish a connection to update the sensor value. when I ...
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1answer
42 views

Arduino HTTP Command - ESPEasy

I am new to Arduino and although I am starting with and creating some basic projects my end goal right now is to be able to turn my Sonoff on and off via a momentary switch attached to my Wifi enabled ...
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1answer
60 views

NodeMCU unable to connect to mobile hotspot when I include codes for reading the temperature sensor

Good day. The NodeMCu successfully connected to mobile hotspot when i didn't put any others codes except the Wifibegin etc. Howveer when I include some codes for temparature sensor, it keeps on ...
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2answers
61 views

How to change wifi credentials of multiple ESP8266 together

I need to change WiFi credentials of multiple ESP8266 in one go, without needing to change passwords for each of them individually. I know there is a WiFiManager library, which makes your ESP8266 ...
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0answers
45 views

Creating a router with ESP32 and SIM800c

I am trying to create a device which is a combination of ESP32 and Sim800c. This device (Master) will start AP mode on ESP32, so that other devices (Nodes) will connect to this AP. The Sim800c will ...
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49 views

How to set up “ESP8266 Wifi Bee” on “Gravity: IO Sensor Shield For Arduino Mega Due”

I'm new to sensors and Arduino, trying to send the live data from my hydroponic garden to Thingspeak. I obviously found tons of info and tutorials on how to connect to Thingspeak - that I can handle. ...
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1answer
76 views

How to get Transmission package Timestamp from ESP8266

I am trying to make an Indoor positioning system using ESP8266 as a beacon, how do I get the transmission package timestamp from router to ESP8266 and vice-versa? Thank you in advance for any advice
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1answer
84 views

How to display CAN BUS information on EPS32 web server?

I try to display the transmitted information from CAN bus on ESP32 web server. I saved the CAN.read() in a buffer receivedChars[i] and try to display the data by client.println(receivedChars[i]);}. ...
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1answer
41 views

Which board to use for wireless communication of small packages? [closed]

I was hoping to get your advice on what Arduino boards to look at for a project I'm working on. The project involves two separate boxes in different rooms of my apartment (~ 5-10 feet away from each ...
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163 views

esp8266 WiFiClient Troubleshooting

I have a pair of ESP8266 modules: 1 Server running in (STA+AP mode or AP mode) and 1 client. The client cannot seem to make a TCP connection to the server. Only changing the wifi-networt, HOST, and ...

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