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.

Filter by
Sorted by
Tagged with
2 votes
0 answers
102 views

How to fix this problem of invalid conversion from 'const char*' to 'char' [-fpermissive] [closed]

Im working with node mcu ESP 8266 and trying to make it a webserver but keep encountering this problem. #include<ESP8266WiFi.h> WiFiClient client; WiFiServer server(80); void ...
user avatar
0 votes
1 answer
222 views

ESP8266 module ESP-12F does not connect to esptool.py

I have bought some blank ESP-12F modules like this: https://www.aliexpress.com/item/1005001520382593.html For these modules I have made my own adapter PCB to connect them, but now I don't get any ...
user avatar
1 vote
0 answers
46 views

ESP8266 ESP-12E: SD2 (GPIO 9) causing reboot when pulled low [duplicate]

I'm working on a project with reed switches, which are connected between a GPIO pin (in pullup mode) and ground. With some of my NodeMCU ESP-12E boards (HiLetGo brand) that I ordered, whenever the ...
user avatar
  • 11
1 vote
0 answers
41 views

Fatal exception preventing flashing ESP8266 ESP-01

My issue arose when attempting to flash several of my ESP8266 ESP-01 module (https://www.aliexpress.com/item/33010444450.html?spm=a2g0s.9042311.0.0.27424c4dNkKYQZ). In the past and with the first chip ...
user avatar
1 vote
0 answers
76 views

Can the Arduino-HomeKit-ESP8266 library be used with the WiFi101 library?

I am currently trying to create a project to setup a HomeKit remote control to control my smart home devices with the Arduino-HomeKit-ESP8266 library. I am currently using a Arduino-based TinyCircuit ...
user avatar
1 vote
0 answers
30 views

Robotdyn esp8266 interrupt from arduino timing

I use a Robotdyn, uno+wifi r3 atmega328p+esp8266. I need to control motor speed and operate few servos. Since the uno has a single timer, I use the esp8266 pin 2 to control motor speed, while the ...
user avatar
1 vote
0 answers
246 views

Nodemcu Lolin v3 Timeout error

I am getting the Arduino console error "the selected serial port serial.serialutil.SerialTimeoutException: Write timeout does not exist or your board is not connected". I recently upgraded ...
user avatar
  • 21
1 vote
0 answers
167 views

ESP8266 NodeMCU Lolin V3 and using Firebase to update its software OTA

I want to update software OTA on multiple of my nodemcu devices that are currently sending data to my firebase database. I found this tutorial (https://medium.com/firebase-developers/over-the-air-...
user avatar
  • 21
2 votes
0 answers
732 views

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 ...
user avatar
1 vote
0 answers
118 views

ESP8266 How to run MQTT Client and Http Client in one loop

Scenario: Existing project: read soft serial then do http post New project: MQTT player from other (MrDIY / MrDIY Audio Notifier · GitLab) Objective: Combine together (Result: successful ) Issue: When ...
user avatar
  • 11
1 vote
1 answer
56 views

ESP8266 with HC05 : expecting to receive more bytes then the 63 received

I'm trying to read a Ant BMS 32H with a ESP8266 and a HC05 module. BMS is sending 146 bytes when asking for these by sending DB DB 0 0 0 0 (HEX) I did test with my android phone and the app 'Serial ...
user avatar
1 vote
1 answer
82 views

Why does the send pin influence the receive pin with Arduino Capacitive Sensing Library

I'm trying to figure out how the Arduino Capacitive Sensing Library https://playground.arduino.cc/Main/CapacitiveSensor/ works. It says: When the send pin changes state, it will eventually change the ...
user avatar
1 vote
0 answers
75 views

RTC DS3231 always remember the old time

I try to change time on windows to test my programing condition but RTC usually keep old time when i change time on windows and re-upload the code . I'm also removing the battery and cut the power it ...
user avatar
-1 votes
1 answer
126 views

How to save sensor value in EEPROM? (ESP8266)?

I would like to save the height of a tank in case of power outage with EEPROM and every time I reboot the board. However, I could not do so after using EEPROM.commit() , EEPROM.get and EEPROM.put as ...
user avatar
0 votes
2 answers
426 views

How do I find out the maximum current through VIN on a NodeMCU board?

I read this answer https://arduino.stackexchange.com/a/51878 to a different, but related question. It seems like VIN on the NodeMCU is directly or via diode connected to the USB connector. Image ...
user avatar
1 vote
0 answers
56 views

Connect ESP8266 with Android Studio App

Hey guys I have ESP8266 and want to remote control a sailboat with it. Till now it works fine but how is it possible to send continuous data between the Arduino/ESP8266 and my smartphone? If you need ...
user avatar
  • 31
1 vote
0 answers
154 views

esp8266 wifi/ read serial data with python

I'm trying to read some serial (ADC) data from my esp8266 nodeMCU v3 over wifi using python. I connected the esp on my local wifi and set it with fixed local IP using arduino IDE, but I couldn't find ...
user avatar
2 votes
0 answers
69 views

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 ...
user avatar
  • 31
1 vote
1 answer
2k views

ESP8266: error: 'getLocalTime' was not declared in this scope

I am getting error: 'getLocalTime' was not declared in this scope when I am compiling this code for ESP8266, however works for ESP32: #include "time.h" void gettime() { static int16_t ...
user avatar
  • 11
2 votes
0 answers
48 views

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 ...
user avatar
1 vote
2 answers
136 views

How Much mA dropped in ESP8266-01 Work in LiPo Battery if the WIFI function is continuously on

I working on the system where ESP8266-01 should continuously on because I want to get the Wi-Fi function on. In that case ,I can't use the Sleep mode which is given in the Esp8266-01 . So, My Question ...
user avatar
0 votes
0 answers
46 views

I'm looking for the StreamSend.h library for use in Arduino/ESP8266 serial communications using struct [duplicate]

I've come across an interesting yet old article within StackExchange which has great examples of sending structured variables over serial communications. The library StreamSend.h and it's source code ...
user avatar
  • 11
1 vote
0 answers
82 views

ESP8266 MCU not clearing memory?

I am still new at this. Using Arduino IDE My MCU was working as a web server with HTML code on SD card using the Webserver sketch. After trying to include other inputs it stopped working with "...
user avatar
  • 11
2 votes
1 answer
134 views

Swap Serial pins of ESP8266?

I have designed and manufactured a PCB which contains an ESP8266 (ESP-WROOM-02D) chip with the serial uart pins connected to a 30pin connector. I made a mistake on the layout (first time designing a ...
user avatar
2 votes
1 answer
970 views

OTA over MQTT for ESP32

Before starting working, I am just researching around how can I achieve OTA over MQTT in ESP32 in using Arduino IDE. The process I understand the esp listen to MQTT messages and then received that ...
user avatar
0 votes
1 answer
104 views

Error saving SPIFFS on ESP8266 - only after 3rd entry

EDIT1 - This phenomena occurs only after reboot using button or ESP.reboot() I'll try to make my question more focused: I have library that saved log events to SPIFFS. From 3rd entry (in the ...
user avatar
  • 820
3 votes
2 answers
462 views

How can I check if my thermostat is on?

I'm working on a project to better understand how my home cooling system behaves. I'd like to produce graphs of temperature in various areas, overlaid with when my existing thermostat turns the A/C ...
user avatar
  • 33
2 votes
2 answers
136 views

Update the ESP to espduino via NodeMCU Flasher

I am using Cactus Micro Rev2 and I'm trying to communicate with ESP via Mega32U4. I guess I have to update to espduino to be able to program the ESP side. And I don't know current ESP firmware version....
user avatar
2 votes
1 answer
119 views

Arduino ESPTelnet.h library read data from cmd screen

I am new to Arduino. I used Arduino IDE for upload code to ESP8266 module. I wrote an ATM application on the tiva-tm4c123 board. I am trying to connect to the application from the internet using ...
user avatar
1 vote
1 answer
70 views

NodeMCU ESP32 as a replacement for my arduino project

I would just like to ask if this microcontroller can power or can manage 2 servos, 2 motors, and 2 hc-sr04 ultrasonic distance sensor combined? Also, does this board come with a bluetooth module?
user avatar
1 vote
2 answers
127 views

How to read wireless doorbell's indicator LED circuit

I have a cheap wireless doorbell. My plan is to include an ESP8266 and power the doorbell from the microcontroller 3.3V output as the doorbell also runs on 3V I specifically chose a model with a LED, ...
user avatar
  • 113
1 vote
1 answer
128 views

Arduino Uno Esp8266 AT commands [closed]

I am trying to send AT commands to esp-01 through serial monitor I have uploaded a blank sketch to Arduino , whatever command I send to ESP I get reply ERROR. After reconnecting esp-01 I got some ...
user avatar
2 votes
0 answers
64 views

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 ...
user avatar
1 vote
2 answers
142 views

How to send data from esp-01 Wi-Fi module to arduino

The L1 is the value i will get from firebase database, but now i wanna send the value that i receive in realtime database to arduino to on LED, how to solve? any suggestion? which mean when arduino ...
user avatar
  • 11
0 votes
1 answer
101 views

ESP32 WROOM32 SPI EMF issues

I'm trying to run Waveshare SSD1327 128x128 screen via SPI on ESP32 WROOM32 board. On ESP8266 (D1R1?) it works flawlessly while using HW SPI but when I run it on esp32, anything connected to mains ...
user avatar
1 vote
1 answer
96 views

Sending Data Between Arduino Nano and D1 Mini

I am sending data from Arduino Nano to D1 Mini, Transmitter is Arduino Nano Transmitter Code: #include <DES.h> #include <SoftwareSerial.h> SoftwareSerial link(2, 3); // Rx, Tx DES des; ...
user avatar
0 votes
1 answer
130 views

Pass Byte Array to Char and Send to a Separate Arduino

I am trying to send data between Arduino Nano and D1 Mini (ESP 8266 Module) My Code as below in Nano which will be the transmeting , #include <DES.h> #include <SoftwareSerial.h> ...
user avatar
0 votes
1 answer
319 views

esp8266 analogRead of 5.5V soil moisture sensor input using voltage divider

On an ESP8266 I try to analogRead(A0) my soil moisture sensor using a voltage divider but I get unexpected low values. The MT3608 increases the esp's output voltage from 3.3V to 5.5V which is the ...
user avatar
  • 103
0 votes
0 answers
464 views

About Finxing ESP8266-01 ERROR UPLOAD ARDUINO IDE (esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header)

I have one ESP8266 01 and can not write blinking example on it, so I have made the below connection on it based on this video, but I get the below error: Global variables use 27980 bytes (34%) of ...
user avatar
1 vote
1 answer
84 views

Unwanted Wi-Fi Jamming by ESP8266

I bought an ESP8266-01 module. I attempted to upload following code onto it. void setup() { // put your setup code here, to run once: Serial.begin(9600); } void loop() { // put your main code ...
user avatar
1 vote
0 answers
92 views

How to get the value of a measurement transmitted by a BLE device?

I would like to use a BLE temperature sensor (such as the Inkbird IBS-TH1 Mini BLE Sensor), however, I want to be able to display the temperature measurements in my own website. To do this I am ...
user avatar
  • 177
1 vote
1 answer
123 views

Why when I try to connect my ESP8266 to my node sever in my localhost it keep getting disconnect and connect?

I think the issue is within the library because I have try to implement this code according to the tutorial that I found in YouTube Youtube. The discussion of this tutorial is the first they implement ...
user avatar
1 vote
1 answer
32 views

ESP8266 AutoConnect ACSelect selection index

I'm trying to retrieve the current selected/saved index of my AutoConnectSelect Right now i'm creating a type that reads the saved json: AutoConnectSelect& bright = settingsAux["...
user avatar
  • 95
9 votes
5 answers
1k views

Same structure taking different memory space on Uno and NodeMCU ESP8266, leading to data corruption when transferring via nRF24L01+

I'm trying to transfer data between a Arduino Uno board to a NodeMCU ESP8266 board, using nRF24L01+ transceivers module and RF24 library on both side. The data I'm transferring are stored in a struct ...
user avatar
  • 220
0 votes
1 answer
2k views

Why am I getting Invalid head of packet (0xF0) error when trying to upload code to esp8266?

Solved : In Mac I went back to Tools --> Boards Manager, then removed 3.0 and downgraded to 2.5 and it started working. I found the solution in this thread. The current connection between uno R3 ...
user avatar
  • 101
1 vote
0 answers
38 views

Deepsleep ESP8266 Thing

I have been trying to get my ESP8266 Thing to go to sleep. Power LED has been disconnected. Problem is that the current consumption is initially (briefly) ~78 uA, but nearly always jumps up to ~540 uA ...
user avatar
  • 11
1 vote
1 answer
77 views

ESP8266-01 module "AT" command testing not responding

Firstly I have connected the Arduino UNo to Esp8266-01 Module and uploaded the Simple Blink Sketch using Arduino Uno and It responded correctly as in the Blue Led Light on Esp8266-01 was blinking ...
user avatar
1 vote
0 answers
33 views

Can't transfer information from esp8266 to arduino

I have esp8266. Which I am trying to set up to be a self-contained access point and server (tcp). ESP8266 is connected to ports 2,3 of Arduino Uno. On Arduino, I want to process all information coming ...
user avatar
1 vote
1 answer
227 views

ESP-01 OTA Error uploading

Im trying to do OTA upload from Arduino IDE. Uploaded BasicOTA to ESP-01 with flash size set to (FS:2mb, OTA 1019kb). ESP-01 connects and shows up in Port selection, but when trying to upload I get ...
user avatar
  • 229
1 vote
0 answers
49 views

how do i get data from the website? using arduino uno and esp8266

i have hosted a website on the 000webhost. And i have simply written a line in paragraph tags in html file( means i have created a html file..) so i want to know to know how i get data that data in ...
user avatar
  • 21

1
2
3 4 5
39