How to make SoftwareSerial Communication between Arduino Uno and NodeMCU

[@planespotcambodia]

I'm looking for this video for so long and finally here it is

[@ropo7852]

Thank you very much, my project didn't work because it lacked the pinMode setup and it took me a lot of time to learn until I saw this video of you.

[@AZ0al9]

Dude thank you, I have searched for countless solutions and this helped me!

[@xidameng]

Thanks MisterP, very HELPFUL video! I had the same problem connecting Arduino to ESP! wish I saw your video earlier.. Please keep up the good work and look forward to seeing more of your video!

[@RedtronKH]

thanks for your feed back

[@sumbunly2822]

i try to watch and learn this from your video for so many times

[@TacticalxRecon]

You are truly a legend. A hero we have been asking for. I salute you!

[@sukanyamore2072]

Which board do I select while uploading data to nodemcu?

[@jktipan87]

never said, in the code there is a esp8266 but when his monitor show us you can see NodeMCU.

[@luialcantaraa]

It worked very well for me and my colleague in our project! Thank you very much!

[@prasoonnigam]

Just the information I was looking for. Thanks a ton for saving my 5 hours with this 18 mins video !

[@esophagoose]

Thank you!! We need more videos like this

[@veeravaananen4905]

Thanks, this is working also with level converter! :)

[@RedtronKH]

Of course it did

[@jonatansantos9260]

Ajudou demais! Conteudo top! Lembrando que é preciso selecionar a versão correta do seu NodeMCU. Estava usando a versão genérica e não tinha conseguido, mudando para versão 1.0 foi perfeitamente

[@mariov57]

Very simple and instructive. Thank you!

[@MrJohnakel]

Thanks for your work. Why use 2, 3 - D3, D2 instead of RX and TX on the boards?. What about the other way communication ? Thanks.

[@itsnadchaos]

did you find out?

[@MrJohnakel]

@@itsnadchaos No, I am not sure now as that project was long ago but it think I went with the tutorial.

[@med6402]

simple but great thnks just what i've been looking for

[@RedtronKH]

Thanks

[@mdshabaz2591]

@@RedtronKH are you able to send the data from arduino to nodemcu?

[@armandobacangjr.559]

Hi how about Arduino pass data to nodemcu esp8266?

[@Ibrafahri08]

how about serial communication between arduino uno and esp32? im already try with the same code as yours but there is an error said this " exit status 1 request for member 'begin' in '1', which is of non-class type 'int' " can anyone help me?

[@calvin-7540]

Same

[@vitoraugusto4819]

You resolved it??

[@manen9102]

can't we just use the rx and tx pin on the arduino for serial communications from arduino

[@jeanmarcreyes6927]

Hi sir I have a question umm i'm really new to these stuffs umm why didn't we use the rx and tx pins of the arduino and the rx and tx pins of the nodemcu esp8266?

[@iwanawaludin95]

because those pins are attached to usb communication, we want to monitor the communication of uno-mcu using usb port.

[@MichelleShum]

how did you compile the code? is it plug the nodemcu to compile or just use arduino uno usb to compile?

[@brentsonjamesbohhong5004]

the d2 and d3 can be raplace to d3 and d4 sir?

[@RedtronKH]

Thank

[@ARPANCS-iw8ew]

Hello Sir, I got to understand the working of this project Setup. But in this Setup the data is sent from NodeMCU to Arduino if im right, how can we reverse this so that i will be able to send the data arrived from arduino to the firebase using wifi

[@phamcang2077]

Ad ! Can you make another video like this but run a component with Blynk soft on phone!! Exp: read the temp from sensor linked arduino sent val to Blynk soft with 8266 node.

[@justinevicente1938]

I also need a example for a Blynk application connected to NodeMCU8266 and connected to Uno

[@Amitkrdas17]

use firebase

[@jonabeld.niegas6198]

i connect one sensor to A0 of analog input in the nodemcu esp8266. then i will put another sensor to A0 in the nodemcu but there is only one A0 of esp8266. Is it possible if i connect other A0 to Arduino uno r3 the A0 then send it to blynk?

[@itsnadchaos]

can I use TX and RX instead of pins 2 and 3?

[@nhat_uet7151]

Hi, I used your code and followed your instruction but I notified that "ESP8266WiFi.h: No such file or directory", I also downloaded a corresponding library but It didn't work. Can you inform me of the proper library for this program? thanks so much!

[@ensarcidic]

Can I change the pin 3 for the first pin, because i have connect that pin with stepper motor driver. Best regards!

[@othmanmirizi6465]

What if we want to send more than one value?

[@tarunsachan2537]

thank you for such a wonderful explanation.

[@RedtronKH]

Thanks and please subscribe to get even more video in the future

[@vamsikiran6430]

When i run the code and upload to ESP8266. It is showing an error, The error says - "error: 'D2' was not declared in this scope SoftwareSerial NodeMCU(D2,D3);"

[@RedtronKH]

It can be cause by order issue

[@vamsikiran6430]

Arduino IDE is not recognising D2 as a number like it does in the case of A0 in Arduino pins. Is there an alternate way ??

[@rizqiaripp]

@@RedtronKH give solution pls

[@mrzaizai2k160]

Let try SoftwareSerial NodeMCU(2,3); 2,3 instead of D2, D3

[@saracastillo4495]

@@mrzaizai2k160 The pins you need are: SoftwareSerial NodeMCU(4,0); since d2 is gpio4 and d3 is gpio0

[@educlub4u]

with the same code and hardware connection ..my serial monitor showing nothing

[@nandhinijagadeesan3835]

Can i connect Arduino mega with NodeMCU esp8266 and then connect to thingspeak to visualize sensor data?

[@madhushaviraj9824]

It works perfectly Thanks

[@rasdavis8390]

From my research u seem to know wat Ur talking bout 🔛☯️🎖️💯 like Ur video u got a new subscriber 🤣😂😂™️

[@islamesmat3000]

It is possible for nodemcu to connect to more than one device

[@calvin-7540]

Inside the setup, The ESP8266.begin(4800) row indicats “request for member 'begin' in '1', which is of non-class type 'int' ”怎么解决

[@rudiimbrechts3064]

Replace SoftwareSerial ESP8266(D2,D3) with NodeMCU(D2,D3). Do the same for all other SoftwareSerial functions (f.i. replace ESP8266.begin(4800) with NodeMCU.begin(4800) ). It is clearly shown in the video at 17:23.

[@alexmod2802]

Hello! Would it not be possible to connect the RX and TX pins of Arduino to RX TX pins of NodeMCU? It is just a question because i use the digital pins 2 and 3 for other purpose in my project.

[@KP__94]

Hello, I have simply followed all your instructions and my arduino and nodemcu working properly but, as you mentioned in video, Rx should be blinking but in my case, Tx is blinking... so can you help me with problem? And also, will this project work with arduino Yun? Please reply.

[@prashantchaudhari7199]

@RedTron - This won't damage nodemcu, right? Asking because ESP works on 3.3v while UNO on 5v.

[@RedtronKH]

So far so good although it won't giving any quick damaging, in theory it is a bad idea but in reality this working fine and might last long

[@RedtronKH]

Thanks for the question anyway

[@prashantchaudhari7199]

Thanks.. yeah, anyways here UNO is not sending to esp...

[@gorillaau]

If you are paranoid, then consider level shifting the 5v to 3.3v and vice versa. It's good engineering practice.

[@neesnisa9015]

Hello. Can I use this uno + usb host shield to mcu? I want to get the data from the uno

[@mr.joyothailottorygamejoyo460]

VERY NICE I LIKE YOUR CHAINAL MY FREND

[@RedtronKH]

Thanks

[@Sam-pc5gm]

In case if we are just using the ESP8266 module not the NodeMCU, in that case can you tell me what pins of esp8266 will be connected to 2 and 3 of arduino and what will be the changes in code?

[@RedtronKH]

nice question bro ? Anyway you can Google for esp8266 download and upload code process as it will show you the schematic board diagram that let you perform the transmit and received data along with pin number, the code on the other is not going to change anything

[@RedtronKH]

You can Google the pin of rx and tx of esp8266-12E

[@Sam-pc5gm]

Okay will try that

[@LatinTotal]

Very informative video bro

[@RedtronKH]

Thanks. And please help me subscribe to get more interesting video in the future 😀

[@qasershah2000]

In your code, the NodeMCU gives the value to Arduino. Am, I right? If so, then how to send Arduino value to NodeMCU?

[@RedtronKH]

I think I had made it all clear in the video

[@onguyen702]

in code NODE MCU. it don't understand D2 and D3. why ?

[@rajdeepiitm-speed-of-ideas]

This way you cannot send data from Arduino Uno to NodeMCU. NodeMCU's Rx pin works only on UART0. However, it will work if you want to send data from NodeMCU to Arduino.

[@d.vldymyr3381]

how can i send data from arduino to nodemcu?

[@walterbenemerito7703]

hi may i know if that is possible to send data from arduinoUno to ESP8266..your video shown esp8266 send data to ArduinoUno..There is a problem im encounter in communicating from arduino to esp.Please HELP ME>>>>

[@ousmanebalde9117]

tank you very much. It works fine for me

[@mtzbadri]

Hello My Name is Mohammed and I am part of a robotics team in BDCHS I have been trying to get an arduino Uno with a RTC module and NodeMCU like your ("How to make SoftwareSerial Communication between Arduino Uno and NodeMCU") work for our competition and I can not get it to work if there is any way could you please help.

[@rendhiardsani]

Can I send multiple data from Arduino UNO to NodeMCU ? only using single TX and RX pin.

[@RedtronKH]

Sure you can

[@rendhiardsani]

MisterP can you help me to find out how to code it?

[@phamcang2077]

U have to code both board. Software sẻial to make a communication . At the uno you print “val” out sẻial , then esp software.sẻial to read

[@worldmemes2809]

Бро, спасибо тебе большое! Я желаю тебе больших Успехов и большого Здоровья!

[@dongletreehenley9744]

hi just downloaded the wifi sketch and tried to upload to my esp8266 board but i get an error message stating "D2 was not declared in the scope" Im sure its me doing somthing wrong! any idea's ??

[@RedtronKH]

Your missing D2 code , just put it back in and you're good to go

[@RedtronKH]

Hi! Please hel me support my channel by subscribe to my channel so that you will receive even more interesting video in the future, thanks

[@icjay1793]

cant find my esp8266 nodemcu file directory on my arduino how?

[@TheDarkforce95]

hi sir . i would like to ask how to send the data we get from uno in nodemcu to blynk ?

[@prototiposcea]

With virtual Pins, they can help you to communicate with app

[@targetsathees1644]

Please give code [e-mail]

[@nickgiachoi8308]

Can I send multiple data?

[@candrasniper3404]

2 way communication in a sametime? Esp8266 to Uno and uno to es8266

[@CryptoBozs]

how to connect esp8266 to UNO to another UNO so on....could you help make diagram and video

[@TeriyakiTK]

I got a question can this connect with Blynk? and how? do I need to upload both code to arduino and NodeMCU? sorry still a newbie on this

[@fadhilinayituriki1678]

u are a genius dawg

[@radiamoon2395]

Hi is there is a way that i can use the analalog pins of the arduino uno(i hava 4 sensors and i want to send there data to a web page using esp8266 ) so i'm having a problem with the code on ide it keeps refusing the code that defines the analog pins of sensors(exmpl: int Ldr= A2) because i'm using the esp board. can you help me plz And thank for the video

[@ibrahimbhavnagarwala7160]

have u solved this yet? I have a similar project.

[@simonegiacomini5287]

Unfortunately this code don't work anymore...

[@mohamedrchidi513]

Hello. Can you help me edit code? I want to add a library Wire.H (I2C). When you press the boutton ON send number 1. When you press the boutton off send number 2

[@mohamedrchidi513]

this cood #include #include #include #include const char* ssid = "your ssid"; const char* password = "your password"; int led = 2; int value = LOW; WiFiServer server(80); void setup(){ Serial.begin(115200); delay(10); pinMode(led, OUTPUT); digitalWrite(led, LOW); Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); server.begin(); Serial.println("Server started"); Serial.print("Use this URL to connect: "); Serial.print(""); Serial.print(WiFi.localIP()); Serial.println("/"); } void loop() { WiFiClient client = server.available(); if (!client) { return; } Serial.println("new client"); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println(""); client.println(""); client.println(""); client.println("First Project"); client.println(""); client.println(""); client.println(""); client.println(""); client.println(""); client.println(""); client.println(""); client.println(""); client.print("ESP8266 Web Server"); client.print("on-off Button:"); client.print("ON"); client.print("OFF"); client.print(""); client.println("Led pin is now: "); if(value == HIGH) { client.print("On"); } else { client.print("Off"); } client.println(""); client.println(""); client.println(""); while(!client.available()){ delay(1); } String request = client.readStringUntil(' '); Serial.println(request); client.flush(); if (request.indexOf('/LED=ON') != -1) { digitalWrite(led, HIGH); value = HIGH; } if (request.indexOf('/LED=OFF') != -1) { digitalWrite(led, LOW); value = LOW; } delay(1); Serial.println("Client disonnected"); Serial.println(""); }

[@norjanahmimbisa7363]

its not working for me, it does not lit up the RX on my arduino Uno board. I followed the steps tho.

[@ThePekopeko123]

hello sir, can I use uno and nodemcu to do IoT device? where the uno will send the data to an app Via nodemcu.

[@RedtronKH]

Of course you can, we will posting video related to this soon so please subscribe to catch up with our latest video

[@ThePekopeko123]

thank you soo much.. looking forward for your video

[@m.k.8440]

I'm trying this but every time Arduino and nodemcu communicate the nodemcu gets disconnected from internet. And to connect them again I need to restart/reset the module

[@carlosalbertoavilaguzman6161]

do i have to connect the 5 v pin of the arduino to de v in of the nodemcu?

[@RedtronKH]

In my video I don't connect but you can connect if you only need one power source connection and nodemcu is support 5v as well but make sure you connect to 5v of node MCU not 3.3v cuz it will damage the board

[@carlosalbertoavilaguzman6161]

it worked really fine, thank you for your support, now i would like to send two different readings from two sensors, do you have any tutorial about this?

[@carlosalbertoavilaguzman6161]

I mean, you send a cariable and then you receive it as val in the nodemcu code, i would like to receive in the nodemcu a val2

[@RedtronKH]

I only have arduino reading sensor but haven't yet making arduino reading and send data ...... But I will do it soon .... Also will do the totorial on how you get the data uploading to internet as well . You can subscribed to my channel so that you won't miss any of my arduino tutorial

[@carlosalbertoavilaguzman6161]

TellWeHow Std ok thank you soo much, I will suscribe. Finally I have donde it, after a lot of experimentation

[@taranagnew436]

can you make it so that you can upload stuff via phone?

[@namratachaudhar7036]

Can we use the nodemcu esp8266 for WiFi connection for the aurdino uno..??

[@RedtronKH]

it would be more in to iot stuff

[@mdshabaz2591]

is this serial communication simplex, duplex or half duplex?

[@zeinabwalid9852]

I got an error : esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header

[@nitishgowrydoss6959]

Is it a two way communication ?

[@sowmiyasowmiya3555]

Can u please help me to connect nodemcu, ardunio and moisture sensoe

[@InnerInsightsII]

It says D2 not declared in this scope and it points out inside the void setup

[@kaneshvaranjayakumar9137]

I was trying to send a 13 digit number to arduino it works but the last 2 digits are not accurate... Is there any work around this? Help will be very much appreciated

[@Tegatreides]

long float?

[@electronician8074]

why you donst using pin 0 and 1 arduino for communication with esp8266? somebody can tell me about this because iam really want to know.

[@likhithmadappady1746]

If u use 0 & 1 pins then u have to disconnect those connections when uploading and I guess serial monitoring is not possible as those pins directly connected over usb for serial monitoring.

[@qayyumyusuff5921]

Can i know, why Tx and Rx is not used? I'm newbie in this things.

[@learnthebasicchannel8394]

it can be use i think if all Digital pins are already in used. I'm a newbie also:)

[@prashantchaudhari7199]

Because the real RX & TX of Arduino and ESP are used for USB connection with computer - that's how you can see the output of the exchange on both sides. Uno and ESP both have only 1 RX-TX each.

[@RedtronKH]

Thanks for sharing idea

[@srijandubey5107]

Can we use arduino nano with nod mcu??

[@RedtronKH]

Sure

[@jktipan87]

wifi:4:24: error: 'D2' was not declared in this scope 4 | SoftwareSerial NodeMCU(D2,D3); I HAD THIS ERROR

[@imspectator6275]

I have a question. What is the purpose of esp8266? Is it similar with nodemcu? And what they are doing and used for? Someone told me that esp8266 is to connect to other device or to a web server. And you can code on esp8266 board without arduino. Is it true? TIA. Sorry for my bad english.

[@imspectator6275]

Also I want to ask what will happen when arduino and esp8266 are connected to each other? Our development is to sense the ph level of river using arduino and ph sensor and we want to send the data/value to website. How to do this? Please help me. Thanks.

[@RedtronKH]

Esp8266 is a wifi module alone, but NodeMcu is a module that contain esp8266 inside and have been well design for even more development purposes

[@RedtronKH]

You can also use NodeMCU(esp8266) for this project but sending data to website you might gonna chose a sending protocol that you think might fit to you, for me I only do the MQTT protocol.

[@imspectator6275]

@@RedtronKH thanks for your response. Now, should I use NodeMcu instead of esp8266 for my project? And when NodeMcu(Esp8266) connected to router or internet in my home, and I will bring the pocket wifi and I will visit the link (the web page) in school which is a long distance, would it still works? Sorry for my bad english again.

[@RedtronKH]

Of course you should use NodeMCU,

[@gurdevparmar]

Great info. My only feedback: you don't have to post video of you writing code. That could've made this video shorter and sweeter.

[@sachinthakagamage982]

can you please tell me how to get value to nodemcu8266 from Arduino like dht11 sensor

[@mohdsultan40]

How to send multiple variables serially from Arduino to esp8266

[@prashantchaudhari7199]

I think a comma separated string would help.. In that case instead of parseFloat, you'll have to use String. Alternatively, you need to define a protocol - say you want to send 10 float values, then send them one after other and separate them by any character, say "," and at end of 10th character, send packet completion character, say " ".

[@RedtronKH]

Thanks for sharing

[@dominicaudy1167]

@@prashantchaudhari7199 Is it possible to publish this part of the code as an example. I did several tests and it doesn't work. Thank you!

[@milepetricevic7218]

i did exactly what is on here but with my mega and I'm not getting anything to send and RX light is not blinking but when i click send in the serial monitor the RX light blinks on my mega but nothing sends. anyone know what the issue can be ?

[@prashantchaudhari7199]

Try without software serial. Mega have more than 1 RX-TX pairs, so use any one other than the one connected to your USB.

[@RedtronKH]

Thanks for sharing

[@vinodmishra5478]

d3,d2 is not identified by arduino, esp8266.h not identified.... kindly write a how to include it in your description

[@byxlettera1452]

I think it's going to demage RX pin on nodemcu. It's 3V3 logic level board and from arduino it will receive 5V. It is a question of time.

[@AhsanAli-gx7jc]

there you must use voltage divider from 5v to 3v3

[@byxlettera1452]

Dear Ali, With a voltage divider everything will be fine. Bye

[@Kostanj42]

so voltagedevider is only needed between TX on arduino and RX on esp?

[@waweyonor6052]

can u help me send data from uno to esp12e and send data to mysql database ?

[@user-ji7mq7sn6w]

bro its show me error with your connection espcomm_sync failed error: espcomm_open failed error: espcomm_open failed

[@gazyalnahdy6870]

Disconnect D2 and D3 pins while uploading the code and then after uploading reconnect it

[@gratefulamateur1393]

Well done! Thank you!

[@Tro79xD]

Good tutorial men nice!

[@luizafernandanarvaeztimana4659]

Hola, puedo usar ArduinoMega 250? en ese caso, sería solo cambiar en el código AurduinoUno por ArduinoMega?

[@lucasmoers]

Yep.

[@thihoan5954]

Can you write the code to load the esp 8266 circuit with the feature of getting the neighbor's wifi password?

[@chandikasachith3980]

exit status 1 no matching function for call to 'SoftwareSerial::SoftwareSerial(const uint8_t&, const uint8_t&)'

[@rizkiadisaputra5971]

can i send data from Uno to ESP ?

[@trtabin8351]

yes

[@chathurafernando1299]

Can i use these codes to esp32?

[@ashutoshshukla5096]

jane loda

[@MrREIVAX2]

ERROR D2 and D3 is not declared SoftwareSerial ESP8266 (D2,D3) ; ERROR change for SoftwareSerial modulo(D2,D3); and continuos error not declared D2 and D3

[@Tegatreides]

Change the name of modulo

[@eduardovelazquezpantoja5083]

can you resolved the problem? i have the same trouble

[@marekGooo]

@@eduardovelazquezpantoja5083 change board type

[@adikrishna7442]

How can i print characters rather than integers.can you response me faster if possible

[@binarybox.binarybox]

Several errors in the terminal...ESP8266 should be NodeMCU ... check the download.ino or look on the monitor @ 14' 26" Arduino Tx should have a level change from 5v down to 3.3v with a level changer unit or a 1K and 2K resistor. 5v inputs to the NodeMCU could damage it.

[@monstersofthemidway4402]

Oh yeah that's right, I had just forgot about that. I seen it in a previous video. Thank buddy.

[@Ahmedhkad]

Are you helping people to destroy their devices ?? its okay to receive 3.3v from esp to arduino . BUT dont send from arduino to esp like THAT!!! you need a "5V-3V IIC UART SPI two Channel Level Converter Module" also you need to learn how to how to split multidata from arduino sensor and send ensure they got recived well without problem

[@RedtronKH]

On theory this really damage the board but in practicing this working fine

[@origamimaster5829]

Exactly what I wanted!

[@ShoppKalimahs]

Great video💪💪

[@hayesseyah8163]

how to send string data or json data?