I am trying to make an attendance system using Arduino uno, RFID-RC522 and nodeMCU WiFi module.
I have followed a tutorial seen on youtube, but I can not get my nodeMCU fixed.
When I hardly plug the GND to it, it will blink and then stop. How do I get to fix this?`
Btw, I have not uploaded anything, but just plugged them all together and connected them to my laptop, so they light up.
The tutorial I am using can be seen in this youtube link
However, I find it weird that on the system architecture in the video, the GND on the nodeMCU module is different plugged than in practice, but I have tried both.
This is my setup