The concept is using the following parts:
- For the push buttons I’m using the microcontroller internal pull-ups. The LCD uses a connector to the front board:
- To LiPo battery gets charged from the 5V tinyK20 USB port. A 3.3V step-up/step-down converter supplies the 3.3V to the tinyK20 board from VBat:
- All the components fit into the 3D printed enclosure:
- The external debug circuit (to use the tinyK20 as debugger) is removed to shrink the box size:
- Below is a rendering of the 3D model for the enclosure:
- With this project I have handy remote controller unit with nRF24L01+ wireless transceiver, battery charger and 5 push buttons to navigate trough menus or play games like Tetris or Snake.
The Eclipse/Kinetis Design Studio project is available on GitHub. The 3D model is posted on Thingiverse. The next step would be to integrate everything into a PCB. Then every student group could use such a tinyK20 board with their robots. Or to use it as a gaming platform. Or as a remote controller to open the garage door :-).
Happy Remoting :-)