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I also wrote a somewhat lengthy mumbling answer combining presettable counters and whatnot, but then I remembered there are those things called “divide-by-N” counters. I didn’t see your answer until after!
Triple 3-input NAND gate. BCD counter asynchronous reset. Hex 2-input NOR enable buffer.
74HC85 Datasheet PDF – Philips Electronics
Hex inverting buffer gate. I’d suggest two or three shift registers latchablelike the 74HC Dual 2 to 4 line multiplexer. For needs like you describe, darasheet is always the option of using a small microcontroller and implement the functionality you need.
Quad 2 to 1 line mux Inverter. Triple 3-input OR gate. Click on the appropriate section below for the relevant data sheets.
Quad 2-input OR gate. Dual monostable multi vibrator. Quad 2-input NOR gate.
I think in order to make the 74hct work, it will need some supporting 74hhc85, just so I don’t need a tremendous number of pins in order for it to work. BIN counter asynchronous reset.
I’m not sure how datasheef hardware interrupt is made. BCD counter synchronous reset. I’m unsure if you can use timer0, as that’s also used for millis and some other rather important stuff Arduino-wise. Triple 3-input NOR gate. Dual D type flip flop 4-bit.
74HC85 데이터시트(PDF) – NXP Semiconductors
Octal edge triggered latch. Quad 2-input NAND gate. The counter can be reset with an arduino output. Quad 2-input exclusive OR gate. Dual 4-bit binary counter. BIN counter synchronous reset.
Octal 3-state inverting buffer. You can use a 74HC 8 bit counter feeding into one side of a 74HC85 magnitude comparatorthen feed datashwet other side from a shift register 74HC Octal 3-state D type flip flop. This is available free of charge from the Adobe web site. I have never used it, but judging from the datasheet it would seem so. Quad 3-state buffer Hi enable. You all may be right, I may be trying to do something that the Arduino can already do, but I just thought that if I could do it off board, I could save the processing cycles for something more important.