Bluetooth circuit design - Help please!

Hi guys, I have a school project which requires me to turn on/off the circuit using bluetooth, is there any sample circuit which I can refer to for this? I am also not sure which bluetooth device to use for my circuit as well. I saw some recommendation for TI CC2540 but it seems so complicated. Do I really need this just for my application of turning on/off?

And advice or recommendation is deeply appreciated.

Google has thousands of tutorials for this. “The circuit” you’re referring to doesn’t help us either.