Powering components on a breadboard is always challenging. Solderless breadboard certainly make it easy but for elegance, you will need to invest in an expensive bench power supply. Trying to power a mass of sensors using the power-pins on a Raspberry Pi or Arduino board is not a good idea because of the limitations placed on maximum current draw that these boards apply. A $1 Breadboard Power Supply module from China is an elegant drop-in solution. It supports 6.5V – 12V input and outputs stable 3.3 V and 5V over two rails up-to 700mA.