I liked the idea of having a custom LED display in my car to send notices to the person in the car behind me.
The CarSwitch is a Particle Photon connected to five buttons which are mounted in a custom case. Additionally a DFPlayer Mini is connected to the photon to play funny sounds by pressing a button. The LED display supports scrolling text, static text and different colors.
Unfortunately custom LED displays are not allowed in the traffic rules so the display is not connected to the photon while the CarSwitch is mounted inside the car.
The photon is able to act as a native keyboard so I decided to build an input device for some computer games. The main parts are the big red and green push buttons which act as classic game buzzers. When pressing one of the big push buttons the WS2812B LED matrix lights green or red depending on button which was pressed first. Additionally the DFPlayer mini which is connected by UART to the photon is playing a buzzer sound on the small speaker.
The five additional buttons are used to trigger additional keys which are useful while playing games.
The pushbuttons used in my smartswitch did no longer respond correctly to presses so I replaced them with some better buttons and adjusted the case. Additionally I included a DFPlayer Mini to play some sounds by pressing a button.