Uploaded November 2019 | Updated September 2026, 2 weeks ago

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Arduino | NodeMCU ESP8266/ESP12E with RFID RC522 | UID / ID Scanner. In this project video I use Arduino IDE 1.8.9 , Notepad++ V7.7.1 , RFID RC522 and LoLin NodeMCU V3 ESP8266/ESP12E.

To add the Library and NodeMCU ESP8266 Board see here : youtube.com/watch?v=8jMr94B8iN0

Download source code here : drive.google.com/open?id=15Zpx6ZqZNQmBTqQT3o-Pfb5Mo0rSv9Ro


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If you get an error message "D2 was not declared in this scope", make sure that you have selected the correct board, the NodeMCU 1.0 (ESP-12E Module) board. If you haven't installed the board yet, see here for how to install it: youtube.com/watch?v=8jMr94B8iN0
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If an error occurs like this or something like this :

Exception (3):

epc1=0x4000bf64 epc2=0x00000000 epc3=0x4000473f excvaddr=0x4023d571 depc=0x00000000
ctx: cont
sp: 3ffffd00 end: 3fffffc0 offset: 01a0
for more complete error display and solution see here : drive.google.com/file/d/19zP6cfRFA2LPx9eFAcTnqa50ir6gM-Zo/view?usp=sharing

Thanks to Prince Okumo (@Prince Okumo) for correcting this error.
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The code file is saved in the .rar file format. I created a .rar file using Winrar V5.50, so to extract it, make sure you use the same version of Winrar that I use or the latest version or use the winrar extractor online.

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Thanks for watching & don't forget to like, comment and Subscribe...
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For other video tutorials on this channel, please see this playlist:

- Basic4Android (B4A) Tutorials : youtube.com/watch?v=-BIq32-qEgA&list=PLnXsmScWzcm6RVlhPM7qg_OJ2N8OpV99d
- Electronics Tutorials : youtube.com/watch?v=rLdsWt6EP6w&list=PLnXsmScWzcm766h5Dn4AJjbJRzDfCPh4h
- Arduino Tutorials : youtube.com/watch?v=A3_EBZqCG5s&list=PLnXsmScWzcm48hvcTTRAUFcP5Fjd4u8cS
- Great Cow Basic Tutorials : youtube.com/watch?v=orHrLmEvp0o&list=PLnXsmScWzcm7xejzacm5cKJMIh_tXXxN8
- Bascom Avr Tutorials : youtube.com/watch?v=JYKSkNQq9eM&list=PLnXsmScWzcm6F9gX1wYenqjKdqVSM7d6B
- VB .NET Tutorials : youtube.com/watch?v=Sy2vjWO0ydM&list=PLnXsmScWzcm4g8AWEJ6WXVUOBh_cWF5_z
- LoLin NodeMCU V3 ESP8266 Tutorials : youtube.com/watch?v=8jMr94B8iN0&list=PLnXsmScWzcm5MERfTvcUNKsYhOUGKe3-V

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Download Arduino IDE : arduino.cc/en/Main/Software
Download Fritzing : fritzing.org/download
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Download RFID MFRC522 / RC522 Library : github.com/miguelbalboa/rfid
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Images and Icons Sources in this video:
NodeMCU V3 ESP8266 : github.com/prasertsakd/esp8266_fritzing
Laptop/PC : iconfinder.com/icons/4417093/code_laptop_mouse_numbers_with_icon
WiFi : iconfinder.com/icons/925808/wifi_icon
WiFi Router : iconfinder.com/icons/473625/communication_internet_lan_network_router_wifi_wireless_icon
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