This one may be of interest to Gadget Masters, about how to interact with Arduino using Node-RED Control. It's an article covering the possibility of automating Arduino use via Node-RED's block ...

It uses a bank of LEDs as an indicator bar to reflect the EMF picked up by the red antenna ... is many times more sensitive to EMF than the Arduino, this turns out to be a quick and easy way ...

If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects ...