It might feel like such a deluge of interfaces is excessive ... Main image remixed from Raspberry Pi 4 GPIO pinout diagram by [Les Pounder].

LDR stands for Light Dependent Resistor ... Once you get these sensors, all you have to do is interface them with your Raspberry Pi and use software like Home Assistant or OpenHAB to run ...

In order to accomplish this, [Bas] is using a light-dependent resistor and a pull-up resistor to create a resistance bridge, which is then connected to an analog input pin on a Raspberry Pi Pico.

And, most excitingly of all, my Raspberry Pi mini-computer-of-the-future arrived ... amongst the smallness is the sheer size of the interfaces -- the chunky ethernet, the double USB ports ...