is wireless connection between nodeMCU esp8266 and arduino uno with wifi shield possible? It's like wifi to wifi connection, I did research for arduino to arduino but I don't have extra arduino, I only have nodeMCU esp8266 microcontroller and arduino uno. Please help me! Thank you in advance.
it is possible
however, why do you require a ESP8266 and a UNO ?
the ESP8266 is far more powerful than the UNO - just use the ESP8266?
give more details of the project?
Looks like OP wants to connect 2 Arduino with WiFi.
I have a fingerprint system project and my professor required me to use arduino uno as my main microcontroller (He only taught us about arduino uno that's why), and I bought tft lcd (supports touch) for the GUI and I stumbled upon connecting it solely to arduino uno because it fits in perfectly, so basically there's insufficient connections for other components like the fingerprint, that's why I'm thinking if I could use my spare nodeMCU ESP8266 with the fingerprint sensor.
p.s. I'm really new to IoT devices and I have little to no knowledge 
can you give details of the LCD and finger print sensor - what interfaces do they use?
Does your project require that the fingerprint sensor and some other part of the system (display?) are in physically separate locations without the possibility of a wired connection between them? If they can be wired together, I'd forget about the whole WiFi thing and keep this as simple as possible.
are you talking about the relation between lcd and the fingerprint sensor? if so, to be specific our project is attendance system using biometric fingerprint. Our project utilizes an ILI9341 LCD for user interaction and an R307 fingerprint module for biometric scanning. And I already research how to connect those two with esp8266 however our professor suddenly requires us to use arduino uno for our main board which is unnecessary. Certainly we can connect the wires without the use of wifi communication, like putting it together in a breadboard. however in the final product, we need to put it in a casing, I tried to search for expansion board for arduino uno, but i can't find one and also we already bought the esp8266, it's such a waste.
Our main problem is the wiring, and it would be disaster to use many jumper wires in a case if I use the breadboard as alternative for expansion board. that's why I thought I could use the wifi as medium for the two microcontroller.
nope it's just that I can't find an I/O expansion board for arduino uno.
Expansion board? Why? You can connect the ESP to Uno using Serial to Serial, no?
Is the project currently working with the ESP? Scan fingerprint, process, display kind of thing? Send a simple char back and forth between ESP and Uno, wouldn't that work as a way to trigger events in Uno, or have Uno trigger events in ESP?
if this is a requirement what is the problem with connecting the ILI9341 LCD (SPI interface) and the R307 fingerprint module (serial interface) to the UNO?
there should be sufficient IO unless there are other devices you have not told us about or you are running out of Flash or SRAM??
what do require the ESP8266 for?
You should never ever use a solderless bread board for anything that is going to be actually used. It is a short term prof of concept only.
Anything that is going to be used needs soldering up, normally on strip board.
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