I have bought this rpi servo hat to control some servos. But I'm wondering if I still can add elements like leds or like a movement sensor to the GPIO. At all examples I can see that the GPIO is soldered to the hat, and it has just servos attached to it. GPIO pins are used just like a bridge.
So, can I add more elements like leds and input sensors to the GPIO using its library and some servos to the headers using the hat's library?