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I didn’t see your answer until after!

7485, 4-Bit Magnitude Comparator, SOIC, 74HC, 74HC85

Hex 2-input NOR enable buffer. Quad 2-input OR gate. To view Acrobat files you must install Adobe Acrobat Reader. Dual D type flip flop 4-bit. Quad 3-state buffer Hi enable.

Octal 3-state inverting buffer. Octal transparent inv op latch. Octal 3-state bus tranceiver. Quad 2-input exclusive OR gate. This is available free of charge from the Adobe web site. Quad 2 to 1 line multiplexer.

I’m unsure if you can use timer0, as that’s also used for millis and some other rather important stuff Arduino-wise.


We hold data-sheets on many items that are found in the stores inventory. A quick googling gave me theor 74HCT, which might fit the bill. Quad 3-state buffer Lo enable.

Is there any chance the Arduino might miss this “count reached” signal? I also wrote a somewhat lengthy mumbling answer combining presettable dztasheet and whatnot, but then I remembered there are those things called dstasheet counters. Dual monostable multi vibrator. 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 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 datasheet order for it to work.

Click on the appropriate section below for the relevant data sheets. Dual D type flip flop E-trig. Quad 2-input NOR gate. BCD to datasheft decoder. BCD counter asynchronous reset.

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.


Dual 4-bit binary counter. Triple 3-input NAND gate. Logic Data sheets Series Component.

74HC85 Datasheet –

For needs like you describe, there is always the option of using a small microcontroller and implement the functionality you need. But it will cost you some 2 PWM outputs for each timer you use.

BCD counter synchronous reset. Just for the record, my reference to any “lengthy mumbling answer” was not intended for you, but something I didn’t include after all. Triple 3-input NOR gate. Grumpy Mike, your circuit might be the ticket!

I’m not sure how the hardware interrupt is made.

74HC85 4-Bit Magnitude Comparator

Dual 4-input NAND gate. BIN counter synchronous reset. I don’t know how often the pulses will be coming in, because it will depend on what the sensor is detecting. Dual 4-input NOR gate. Quad 2-input 3-state mux.

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