I added a LED flash to my gameboy camera to help with indoor/low light level photos. I designed a flex PCB to position the LED's and I used a capacitive touch chip (TTP223-BA6) and some copper tape to turn it on and off without having to have a switch. For more info please go to the blog post linked below.
Blog - https://facelesstech.wordpress.com/2023/07/03/gameboy-camera-led-flash/
