Assemble the circuit, using the prototype PCB from my files or just a standard PCB.

The connections are as follows:

Setup:

Arduino nano

Bluetooth HC-05

Addressable 16 LED`s two rings

NRF Module

Pinout:

Arduino Nano 5V:

D9-->CE NRF

D10-->CSN NRF

D13 (SCK)-->SCK NRF

D11 (MOSI)-->MOSI NRF

D12 (MISO)-->MISO NRF

D3-->IRQ

D6-->NeoPIxel DataIn 1

D7-->NeoPIxel DataIn 2

For power source, i am using a 12V power adapter, connected through a schottky diode to the arduino nano board, in addition to a 5V Step down for the LED rings. With addition of 470 uF for the LED`s 5V.

3D print the STL files and you have a timer clock.

For building the Smart juggling balls look here: https://hackaday.io/project/5466-smart-juggling-balls