Wireless Sensors with Home Assistant set up

Hello All,

I have three wireless sensors in two rooms, which are about 80ft and a 1 floor removed from both my Raspberry PI and Konnected boards.

I had a Honeywell System, originally, and i have the wireless reciever in the basement where the main panel used to be.

But i'm looking for new options, i don't care about reusing the old hardware. I have 3 windows which i just need a way to communicated to the konnected board when they are open.

Does anyone have any advice on this front? Again, i don't have to use the old stuff, i'm willing to replace it with something new.