Quantity   Component name
1 × Arduino Nano (5V) The older Arduino Nano - compact and inexpensive. Note - 5V version
1 × SP LEDs - in various configurations Serially Programmable RGB LEDs. They'll illuminate when you tell them to, and in any colour
1 × Printed Circuit Board I made a PCB version of an initial protoboard i'd built for a single purpose
4 × Terminal Blocks The screw-clamp version of the handy blocks to attach wires to a PCB
1 × OLED Display A 128 x 64 pixel mini display w/ I2C interface - widely available
1 × Push Button A single-button interface uses a pushbutton to control the UI
2 × Pin Headers Two rows of female headers to mate with the Arduino Nano
1 × Power Switch (Beefy) A switch capable of an Amp or two is key for power routing
3 × 3D printed parts A 3D printed case, lid and a centring frame for the OLED display and clean up the final project nicely. Screw mounts are a nice feature.