If a shift register is basically a group of transistors (?) would you need to us
ID: 2081210 • Letter: I
Question
If a shift register is basically a group of transistors (?) would you need to use a shift register and a transistor when making an LED clock (the LED matrix is separate LEDs ~45) ? It's being ran through and Arduino Uno if that's any help. I want to kind of control it by column instead of as a whole if that makes any sense. I was thinking a shift register connected to a NPN transistor then just connecting the transistor to the LED-resistor part. Would I need a transistor and a shift register though or can I just use a transistor? Also, if I were to run two columns for like an '8' on the clock would I need 2 shift registers and 2 transistors (one for each column)? One to control half of the number each?
Explanation / Answer
Shift registers are needed when the no of data output pins of LED for display are more than what is there in uno.Shift Registers are logical IC's that can hold or shift data sent into them. They only take up three pins. You can combine this with the arduino function "ShiftOut" .Multiple shift registers can be chained together still using three pins of an arduino .If you use a shift register I think you may not need transistors
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