One interesting discovery is that you can use a dual plug USB 3.0 cable like this by Lindy for the hard drive: the black plug goes into the Rpi, the red to an USB power adapter. You need to power the disk and the Rpi simultaneously, otherwise the Rpi will suck the power for itself through the black USB plug, something that I believed was not even possible!
Early tests suggest that I should be able to power the whole effectively with three sockets only: one for the switch’s own power adapter, one for this nice Kensington 4-USB charger (although be careful, as the device got lots of bad reviews) and the last for a dual USB charger to which I connect the hdd and the Rpi using it.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.