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Hex 3-state inverting buffer.

74HC85 4-Bit Magnitude Comparator

Is there any chance the Arduino might miss this “count reached” signal? For needs like you describe, there is always the option of using xatasheet small microcontroller and implement the functionality you need.

BIN counter synchronous reset.

BCD counter synchronous reset. Quad 2-input NAND gate. Triple 3-input OR gate. Quad 2 to 1 line multiplexer. Quad 2 to 1 line mux Inverter.

(PDF) 74HC85 Datasheet download

Dual D type flip flop 4-bit. Grumpy Mike, your circuit might be the ticket! Just for the record, my reference to any “lengthy mumbling dztasheet was not intended for you, but something I didn’t include after all.


Quad 2-input NOR gate. I’m unsure if you can use timer0, as that’s also used for millis and some other rather important stuff Arduino-wise. Quad 3-state buffer Hi enable. You can use a 74HC 8 bit counter feeding into one side of a 74HC85 magnitude comparatorthen feed the other side from a shift register 74HC 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.

Octal 3-state D type flip flop. Schmitt Hex inverting gate. BIN counter asynchronous reset. This is available free of charge from the Adobe web site. I didn’t see your answer until after! I didn’t want to use the Arduino directly.

Settable (dynamically) counter IC

Hex 2-input NOR enable buffer. A quick googling gave me theor 74HCT, which might fit the bill. Quad 2-input 3-state mux.

I’d suggest two or three shift registers latchablelike the 74HC Dual 4-input NOR gate. It can divide the input frequency from 3 to Hex inverting schmitt trigger. Click on the appropriate section below for the relevant data sheets.


Dual 4-input NAND gate. Octal edge triggered latch. Logic Data sheets Series Component. Dual D type flip flop E-trig.

Quad 2-input AND gate. Into the feed your number with the shift out tutorial. Quad 3-state buffer Lo enable. To view Acrobat files you must install Adobe Acrobat Reader. D More importantly, how fast will these signals be?

Dual 4-bit binary counter.