[Fully Explained]--Single Data--Serial Communication between Arduino and NodeMCU (ESP8266) 

have you completed above project

Yes, Arduino mega will also work

Did u make any progress??

I can send data from arduino's sensors to nodemcuesp8266 and display the data on the thingspeak , can work for you

Usama, there is no need of level shifter for serial communication

@@tamizhdiynaveen1354 in fact it is needed for protecting nodeMCU, you can use a voltage divisor with 2 resistors

do u have a schecmatic diagram for this?

That's correct

Check the USB ports or interchange the usb ports

@@tamizhdiynaveen1354 nothing happens even after exchanging the usb ports

Hi MrREIVAX2, Yes that's a great idea. We have implemented communication from Arduino to NodeMCU. The other way is also possible. Interested in controlling Arduino from RaspberryPi then check this -->mybtechprojects.tech/control-arduino-from-pi-using-gui/

I use sensors like dht11 and mq7, mq135 to send data via arduino to nodemcu and the data displays on webserver and thingspeak, bit this video works to me

Hi Abdul, Thanks for watching this video. Check whether the baud rate is the same in both nodemcu and mega.

@@tamizhdiynaveen1354 it is the same baud rate for both mega and nodemcu. thanks for this i finally can figure out the data sending from mega to nodemcu must be in form of string or else that i dont know. your code somehow cant be used on mega. i dont know why and it took me 6hours troubleshoot the code without success. but i do my own code and the data sending is work after that. any thing you can comment on that mr ?

@@TheDarkforce95 can u show your code.. cause i also do the same thing on my arduino mega but still cant read any output on serial monitor

@@syameezanatasha8349 gist.github.com/darkforce95/dc3a8a1062b3228b95e8e5b039d10108 if u need help do commend

@@syameezanatasha8349 create 2 file . 1 for mega and 1 for nodemcu . refer my gist

Try with other USB ports

TamizhDiy Naveen I have software failure

TamizhDiy Naveen now I am clear and complete the project

i encounter the same issue.. how you solve it?

@@amirulhazeiq8997, connect in other usb ports

Yeah, it's right. But we use 9600 baud rate(i.e maximum 9600 bits per second can be transferred) for effective communication between Arduino and nodemcu.

@@tamizhdiynaveen1354 i don't think 9600 is perfect for communication b/w node and Arduino there is more rate available but it is another mater I am saying there's a lot of difference b/w bit rate and baud rate And u are arguing once again bit and baud are same which makes no sense plz Google first Search bit rate vs baud rate

it dont has to be s. Device A has to send a message to device B to trigger an answer - in this case the message is the character 's'