Well,the first version has many thing to improve

here is some point,

first the RTC can change to DS3231M or DS3231 ,which reduce the component count and improve the percision

second ,in the PCB layout, the inductor is way too far from the Step-up IC

third the Step-up IC can change to something better

fourth the VFD controller need scanning ,so I want to using a Attiny to control MAX6921

These may improve at the version 2