ON my project, i have also an lcd i2c display. When i power supply the project from a external source, not from usb cable for arduino, the lcd display doesn't show any data. Just powers on the screen. Do you have any idea what could be the issue?
Square pad or red/pink marking on a flat cable means this is the first pin, and not ground pin, it haven't any standard for this, just do warn about this. Groud is easy to find with the ground plane on the PCB!
I have the same one I was wondering mine was a bit different they want me to open html to get that program u have on ur screen can yall recommend me a way
Sir after giving all connections and we r going to dump the our project code but it's comming like finger print is not detected what's problem in that please tell sir wt we want to do for that one please help me sir .......
Quick question. When connecting to the NodeMCU board, what pins are you using for the serial communication with the fingerprint sensor? What does that look like with regard to using SoftwareSerial?
I dont know how nodeMcu could work with this fingerprint sensor. This fingerprint sensor uses TTL levels and NodeMcu works only with 3.3v. I think it needs a level converter to work properly.