I don't see the reason for using the term "propeller". There's no Propeller chip in there, and the led's are apparently used for a clock - ?
Like 3V0 said, the ULN2803A is unnecessary. You could also save yourself some wiring pains and free up port pins by cascading shift registers instead of using those parallel latches.
shift registers are fine in you run them fast enough. If there is still a flicker you just add a transistor to turn off the LEDs while you are shifting.
Since the board will rotate, I think, VCC and GND must connect to my board through motor. Witch type of motors you suggest?
I think the weight of board is less than 600g.
I think turqe of 3000RPM is good.
Also I think motor should work with 12v.
I think it is heavy for fan but motor (hard drive) can handle it.
Also I think weight is not more than 300g (I told 600g with heat sink and other components witch may be becom necessary).
You could use a LDO regulator and pre-regulate it's input voltage down to 7 Volts or so. Then you may not even need a heatsink.
You almost have enough IO pins to do away with the latches all together. If you used a PIC with more IO, you could save some weight that way.
One question however. How are you going to set the date and time on your clock?
You could use a LDO regulator and pre-regulate it's input voltage down to 7 Volts or so. Then you may not even need a heatsink.
You almost have enough IO pins to do away with the latches all together. If you used a PIC with more IO, you could save some weight that way.
One question however. How are you going to set the date and time on your clock?
I bought all components but I don't know what type of DC motor you suggest for rotating the board?
I think, VCC and GND must come from motor. Is it true or not?