Multiplexers
Multiplexers
When building panels, you may encounter situations where you have more buttons for input than available pins on your board. Multiplexers like the 74HC4051 (8-bit) and 74HC4067 (16-bit) allow you to read input from 16 buttons while only using five pins on the board. Additional multiplexers connected to the same board only require one additional pin.
Important
MobiFlight only supports connecting buttons to multiplexers. Encoders must be connected directly to a board.
Popular options
The 16-bit 74HC4067 multiplexer is widely available mounted on breakout boards. The MobiFlight shop sells individual boards and a 32-input breakout board.
Other sites selling the 74HC4067 include Amazon, eBay, AliExpress, and many other parts suppliers.