GrovePi + sensor shield with Raspberry Pi 4

Hi I am working with Grove PI plus shield and now trying to interface it with RPi 4.

As I am not getting any output when running the programs to interface different sensors while on the same time I am not getting any errors also.

My Pi4 is also detecting the shield as per the instructions given for GrovePI+ shield. Need help in working it out.

Question are you using Raspbian for Robots? It is based on Raspbian Stretch. When the RPi4 came out it was after the new Raspbian Buster was released. Potentially that may be the issue. I recommend giving stock Raspbian a shot. https://www.raspberrypi.org/downloads/raspbian/

And you can install the grovepi software from here:

Let me know if you have any difficulties.