Instead of powering the breadboard from an Arduino or Raspberry Pi. I am using a breadboard power supply module. It is 7-12V capable. I am going to use the 9V power supply that power an Ardiuno.
Under this power module you have two sets of pins on each side. These connect to each side of the breadboard.
On each side of the power module. you have + and – to match up the breadboard. As you can see they match up with the red (+) and blue (-). I set the left side to 5V and right side to 3.3V to match up to the 9V power supply.
The 4 x 2 pin connectors provide 5V and 3.3V. Top left pins are 5V. Bottom left pins are 3.3V. Right side are ground pins.
In order to test the power output. I will add two simple LED circuits.
5V – 1.8V = 3.2V / 0.020 A ≥ 160 Ω
3.3V – 1.8V = 1.5V / 0.020 A ≥ 75 Ω
On left side: 150 Ω + 10 Ω resistors for 160 Ω . Multimeter reading is 159.2 Ω.
Brown – Green – Black – Black – Brown
150 Ω: 1% tolerance or 1.50Ω.
Brown – Black – Black – Gold – Brown
10 Ω: 1 % tolerance or 0.1 Ω
Voltage below the LED : 5V by multimeter
On right side: 68 Ω + 10 Ω resistors for 78 Ω . Multimeter reading is 78.0 Ω
Blue – Gray – Black – Gold – Brown
68 Ω: 1% tolerance or .68 Ω
Brown – Black – Black – Gold – Brown
10 Ω: 1 % tolerance or 0.1 Ω
Voltage below the LED : 3.31V by multimeter