boolean key_in;
// To get more inputs, another 4051 analog multiplexer is used,
// but this time it is used for digital inputs. 8 digital inputs
// on one input line, as long as proper debouncing and filtering
// is done in hardware :P
boolean key_in;
// To get more inputs, another 4051 analog multiplexer is used,
// but this time it is used for digital inputs. 8 digital inputs
// on one input line, as long as proper debouncing and filtering
// is done in hardware :P