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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153 views

When uploading a sketch to an esp8266, isn't that the same as “flashing firmware”?

I thought that I read that using a PC running the Arduino IDE to "upload a sketch" to an esp8266 overwrites the original firmware (with the AT commands), and is actually "flashing the firmware" each ...
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1answer
415 views

Using ESP8266 Adapter with Temperature/Humidity Sensor

Good Day. I am currently following a project where I can send data to my firebase database using an ESP8266-ESP01 wifi module and DHT11 temp/hum sensor. I am using this adapter to enter the boot mode ...
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3answers
17k views

Can the WiFi on ESP8266 be disabled?

I've been reading a lot on the ESP8266, but still my understanding is shaky. I have the Arduino IDE running on a PC, which uses wires to connect to the ESP8266 via a USB device (Device Manager > Ports ...
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1answer
276 views

LinkNode D1 Serial stops working when using pinMode

The following code works. I get an output in the console every second of "Hello" and then the analogValue of the photoresistor. int greenLedPin = D1; int yellowLedPin = D2; int redLedPin = D3; int ...
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1answer
2k views

ESP8266 connecting keypad and lcd display

I have ESP8266 type - I have added a keypad With a standard lcd display. I have connected the keypad from d0 to d7, however after watching some tutorials i have to connect the lcd display(SDA,SCL)...
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1answer
199 views

Format error with ESP8266 compile

I get this error when I try to compile and upload the code for the ESP826612E fork/exec /home/c/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-g++: ...
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2answers
5k views

ESP8266 Send data to Firebase using Arduino Uno error

Good day everyone! I have a project, in which the data from a button (number of clicks) will be sent to a real-time Firebase database. Every time the button is clicked the counter increases and will ...
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0answers
875 views

Connect ESP8266 ESP-12 with 2 arduinos

I understand how to connect one ESP-12 to an Arduino, but it's possible to make the ESP-12 connect to two arduinos? I found a lot of information about the gpio as txd-rdx but not at the inverse. Is ...
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1answer
11k views

Simple Multiple RX/TX SoftwareSerial?

In this project I will be using multiple ESP8266 WiFi modules (4) connected by software serial to an Arduino Leonardo Micro (1 UART). I plan to rotate between all 4 (starting with 2): Open port, write,...
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1answer
318 views

Can I get the arduino to run ESP8266 code? [closed]

So I got this water flow sensor that measures the flow of water. I also got an ESP8266 module to help me make HTTP requests. So as far as I know, one must set the board type to Generic ESP8266 and ...
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3answers
361 views

Can't find OV2640 module! pid: 254

I'm trying to follow this tutorial. But I'm stuck in this error: Can't find OV2640 module! pid: 254 I tried to contact the author of the program, but I have not had an answer yet. I'm using the ...
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1answer
1k views

FPC1020 + WeMos D1 Mini

I have a FPC1020am that work perfectly with arduino and a ESP8266 D1 Mini V2 NodeMcu 4MB Lua that can connect to server. How can I connect the FPC1020 direcetly to ESP8266 D1 Mini to scan finger and ...
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2answers
2k views

(ESP8266) Check if a SSID is in range

I need to check if a given SSID is in range. Would be good if it didn't disconnect from the current wifi network that it's connected to, but it doesnt matter, i just need to see if a SSID is in range, ...
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1answer
19k views

Get hour with ctime (time library with ESP8266)

#include <ESP8266WiFi.h> #include <time.h> const char* ssid = ""; const char* password = ""; int timezone = 3; int dst = 0; void setup() { Serial.begin(115200); Serial.setDebugOutput(...
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1answer
289 views

Change Token authentication method to MQTT authentication method(username, password, client_id, ssid, passwd)

I have a mq135 sensor abd nodemcu ESP-12E module to calculate air quality and monitor it via Cayenne platform. How can I edit this below code to add and connect my Nodemcu ESP-12E module to cayenne ...
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2answers
2k views

ESP Wemos D1 upload fails

I try to upload simple code (e.g. blink.ino) to my ESP8266-12 (I have the WeMos D1 breakout board). Until now, that worked without a problem: I had to pull GPIO0 down and then I could upload the ...
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0answers
37 views

Arduino Uno wont power up when GND is plugged in Logic Converter

Good day. I am trying to use an ESP8266 12e Wifi Module that requires 3.3V I used a Logic Converter to reduce the 5v to 3.3v My problem is when I plug the GND from the arduino to the GND on the Logic ...
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3answers
381 views

Weird issue with software serial?

Hi i am trying to write a library to communicate between the arduino and the esp 8266. I wrote a command that that sends an AT command to the esp chip. So far I have tested these commands : AT, AT+GMR,...
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2answers
328 views

Can I use an ESP8266 as a replacement for an original Arduino?

I want to learn Arduino, but I'd like to use the ESP8266 as it has built in wifi. I understand that I can use the Arduino IDE for this board. However, what about books and resources out there? Are ...
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304 views

Esp <--> Esp Communication

I'm aware of and currently using an MQTT network to facilitate communication between several Wemos D1 Mini's but that method obviously relies on having a MQTT broker. Is there a way to have the ESP's ...
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1answer
420 views

Using Thinger.io Wifi together with HX711 library soft resets ESP8266 (NodeMCU)

I'm trying to get my NodeMCU v1.0 board to read from a load cell connected to a HX711 amplifier and send the data through Wifi to Thinger.io. I managed to make the readings from HX711, works perfectly....
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1answer
517 views

Send AT commands programatically to ESP8266 without Arduino

Let me explain my question in more details. I want to use ESP8266-01 as standalone micro-controller for my project. I don't want to use Arduino or any other board with that. Using Arduino i can use ...
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1answer
605 views

Communicate between NodeMCU ESP8266 gateway and multiple sensor nodes

What is the best wired way to communicate between multiple NodeMCU ESP8266 boards for home automation. Every room should get at least a light, temp, PIR and xx relay modules to switch things on and ...
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0answers
118 views

ESP8266 stops reponding [closed]

I have my esp8266 connected to arduino UNO and I use it to turn on/off a relay, it works perfectly fine when I use a light bulb, or low power devices, but when I use a fan, after a couple of switches, ...
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1answer
6k views

ESP8266 send TCP HEX packet with 4 chars

I'm building a remote for my WiFi-RGB Lights. I have an ESP8266, which should send one TCP packet with 4 chars. My code: #include <ESP8266WiFi.h> const char* ssid = "Wifi"; const char* ...
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1answer
627 views

Connecting NodeMCU with OV7076 camera

I am trying to connect an OV7076 camera with a NodeMCU, but there are no pin diagram available for it. As NodeMCU has 4 MB storage and 128 KB memory, is there any possibility to use it? AI thinker ...
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1answer
9k views

How to create a simple TCP server with the analogRead value on Wemos D1 mini?

I want to create a TCP server on the Wemos that serves the analogRead value of the connected potentiometer. The code below is based on this example. The Wemos connects to the Wi-Fi and i'm able to ...
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0answers
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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2answers
4k views

mcufriend 2.4 TFT with ESP8266

I have this TFT: Now, the problem is, I will not use this as a shield (i.e. I will not just put it on top of an Arduino Uno). I will use it with an ESP8266 (NodeMCU). I want to know how to wire them ...
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1answer
131 views

Trying to communicate with an ESP8266

G'day guys, I'm trying to get an ESP8266 to work with an Arduino Uno.Here is the wiring. When I go to the serial monitor (115200 baud) and type: AT, there is not response from the ESP8266.Is there ...
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1answer
7k views

String to persistent memory (EEPROM?)

I am creating a server node that I want to be able to save the wifi SSID and the password into persistent memory so that when it starts ups it can connect to the network. I have looked for several ...
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1answer
545 views

Possible ArduinoJson bug on ESP8266?

I'm making a small IOT project using the ESP8266 in which I make 2 API calls: api.openweathermap.org for weather data api.timezonedb.com The request logic is the same for both calls, the only ...
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2answers
22k views

Serial Communication between ESP8266 and Arduino Uno

I want to send data from arduino to ESP8266. I have done all the RX and TX connections. The problem is that data is not sent every second, it stops after a single byte. When I remove the arduino cable ...
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1answer
3k views

ESP8266 UDP multicast doesn't receive packets

I am currently working on an ESP8266 with the Arduino IDE. I try to implement an ESP8266 in STA mode as multicast receiver. I was writing my code with the help of this documentation. Especially the ...
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2answers
281 views

Neopixels with I/O expander

Because I have no pins available on my Wemos D1 mini, I want to drive my Neopixel ring from a MCP23008 I/O expander. I'm trying to run the 'simple' example from the Adafruit_neopixel library. How do ...
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1answer
404 views

ESP8266 + NeoPixel - Cannot set pixel color, I got “Exception 29: StoreProhibited”

I'm trying to use NeoPixel on the ESP8266. I made simple test put all required code into setup() and loop() methods. Then, to keep everything in order I create a class LedModule which handle the led ...
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1answer
4k views

error: espcomm_upload_mem failed ESP8266

So, I downloaded tools for my ESP8266 using this link: http://arduino.esp8266.com/stable/package_esp8266com_index.json I installed the last version in my motherboard manager (2.3.0) and tried to ...
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1answer
1k views

read CID of SD card with SD.h library

I would like to be able to read the serial numbers of SD cards using the SD.h library. Only reading the values is enough, I am not looking to modify the CID. This should be possible but I do not have ...
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1answer
83 views

Certain String Characters To Int

I have a char* array which looks like this "T 20" and I'd like to extract the "20" and convert it in to an integer. I was thinking of using atoi() but it seems that function will operate on the entire ...
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2answers
31k views

How to fix: Invalid conversion from 'const char*' to 'char*' [-fpermissive]

I'm trying to upload the code from here to work with an ESP8266. So I copy/pasted the code to the Arduino IDE and I get this error: C:\Program Files (x86)\Arduino\libraries\WiFi\src/WiFi.h:79:9: ...
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3answers
497 views

Not able to get response from esp using Arduino uno

I am new to Arduino & ESP modules, here am trying to communicate with ESP-01 via Arduino UNO. I have gone through multiple websites for initial setup. But when i upload my code to UNO, ESP is not ...
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0answers
6k views

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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1answer
12k views

Wi-Fi module 5 GHz [closed]

What is a Wi-Fi module for an Arduino that works on 5 GHz? The ESP8266 - doesn't support 5 GHz according to: Re: 802.11AC 5GHz Why can't ESP8266 operate in 5 GHz since 802.11N is supported my own ...
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1answer
1k views

Setting ESP8266-01 up with AT commands

I am facing for the first time with the ESP8266-01 module, so sorry if will write any stupid things. I bought this module and I wanted to check its parameters through AT commands. Following some guide ...
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1answer
2k views

ESP8266 cannot read POST parameters

I'm working on a simple REST server. I made method to handle http://<esp8266_IP>/test. The GET method works like a charm and I got the response. Then I tried to send a POST with a JSON data (I ...
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0answers
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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0answers
2k views

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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2answers
3k views

How to pass variables to custom callback functions

I want to use the Ticker library of the ESP8266 Arduino core to (asynchronously) delay the switch of a pin to a desired state like below. I am not sure about the "here is" function definitions and I ...
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1answer
254 views

Parse an element that consists of an array using ArduinoJson [closed]

I want to parse an json element that consists of an "array". In this case solar->solardata->calculatedconditions->band[0-7] How can i do this? My attempt was: String data = root["solar"]["...
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1answer
5k views

Can I use NodeMCU 12E (ESP8266) as wifi shield for arduino Nano?

Update: Point 1- I don't want to program ESP, I just want to use it as a wifi shiled. cause I'm not familiar with flashing or writing sketch for ESP, so still feel comfortable with arduino. beside my ...

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