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Triple 3-input OR gate.

I didn’t want to use the Arduino directly. Hex 2-input NOR enable buffer.

And not the lest, what westfw says! Triple 3-input NAND gate. Triple 3-input NOR gate. Dual 4-bit binary counter. Is there any chance the Arduino might miss this “count reached” signal? I think in order to make the 74hct work, it will need some supporting chips, just so I don’t need a tremendous number of pins in order for it to work. Dual D type flip flop E-trig. D More datashdet, how fast will these signals be? Schmitt Hex inverting gate. Octal edge triggered latch.

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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 Quad 2-input exclusive OR gate. I don’t know how often the pulses will be coming in, because it will depend on what the sensor is detecting. Quad 2 to 1 line multiplexer.

Octal transparent inv op latch. BIN counter asynchronous reset.

74HC85 Datasheet PDF –

Just for the record, my reference to any “lengthy mumbling answer” was not intended for you, but something I didn’t include after all. BCD datasheett asynchronous reset. Octal 3-state inverting buffer.

For needs like datassheet describe, there is always the option of using a small microcontroller and implement the functionality you need. I have never used it, but judging from the datasheet it would seem so. Logic Data sheets Series Component. Quad 3-state buffer Lo enable. Triple 3-input AND gate. I’d suggest two or three shift registers latchablelike the 74HC Dual 4-input NOR gate.

Grumpy Mike, your circuit might be the ticket! Hex inverting buffer gate. We hold data-sheets on many items that are found 74hc5 the stores inventory.

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7485 – 7485 4-bit Magnitude Comparator Datasheet

Octal 3-state D type flip flop. Quad 2-input NAND gate.

Datassheet on the appropriate section below for the relevant data sheets. 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. Quad 2-input NOR gate.

I didn’t see your answer until after! I just thought that if I could have something external count the pulses, I could have the Arduino doing something more important. This is available free of charge from the Adobe web site. BCD to decimal decoder. I’m not sure how the hardware interrupt is made.

Datasheet «CD54/74HC85»

Dual 2 to 4 line multiplexer. Quad 2-input 3-state mux. Into the feed your number with the shift out tutorial. BCD counter synchronous reset.