Basic firmware Arduino code for the Sandbox.
You need to include some libraries. To install libraries, follow this link, or open the IDE and click to the "Sketch" menu and then Include Library > Manage Libraries.
- TimerOne.h: https://www.arduino.cc/reference/en/libraries/timerone/
- TimerThree.h: https://www.arduino.cc/reference/en/libraries/timerthree/
- TimerFour.h: https://www.arduino.cc/reference/en/libraries/timerfour/
- LiquidCrystal.h: You don't need to add this library, as it is usually included. https://www.arduino.cc/reference/en/libraries/liquidcrystal/