This programmer is interesting because it allows for different programming strategies depending on the day of the week. Personally I have 4 programs that work with power ranges of hours in the morning and evening and those for the week and the weekend.
The only trouble is that I can receive only 1 to 3 programmers that works, mainly due to problematic welding qualities.
It is a shame because the principle is excellent.
The design could be reviewed and it would make a good base.