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Grumpy Mike, your circuit might be the ticket! 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.
Schmitt Hex inverting gate. Dual 2 to 4 line multiplexer.
74HC85 – 4 Bit Magnitude Comparator
Quad 2-input exclusive OR gate. I’m not sure how the hardware interrupt is made. But it will cost you some 2 PWM outputs for each timer you use. Dual 4-bit binary counter. I don’t know how often the pulses will be coming in, because it will depend on what the sensor is detecting. Click on the dtasheet section below for the relevant data sheets.
Octal 3-state bus tranceiver.
I am doing a handful of analog readings which as I’ve read take significant amount of timeI am currently driving 2 servos PWM outputand I still have more features I am trying to add.
Octal 3-state D type flip flop. Quad 2-input NOR gate. Dual monostable multi vibrator. BCD counter asynchronous reset.
Settable (dynamically) counter IC
BCD counter synchronous reset. A quick googling gave me theor 74HCT, which might fit the bill. 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. BIN counter asynchronous reset. This is available free of charge from the Adobe web site.
Hex 3-state inverting buffer. Octal 3-state inverting buffer. Triple 3-input AND gate. Quad 2-input OR gate. 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 Into the feed your number with the shift out tutorial. Dual D type flip flop E-trig. Hex inverting schmitt trigger. Hex 2-input NOR enable buffer. I have never used it, but judging from the datasheet it would seem so.
I didn’t want to use the Datasheeet directly. I just thought that if I could have something external count the pulses, I could have the Arduino doing something more important. Octal edge triggered latch. We hold data-sheets on many items that are found in the stores inventory.
And not the lest, what westfw says!
Triple 3-input NAND gate. Triple 3-input OR gate. I’d suggest two or three shift registers latchablelike the 74HC D More importantly, how fast will these signals be?
Is there any chance the Arduino might miss this “count reached” signal? For needs like you describe, there is always the option of using a small microcontroller and 74hv85 the functionality you need.
Just for the record, my reference to any “lengthy mumbling answer” was not intended for you, but something I didn’t include after all. To view Acrobat files you must install Adobe Acrobat Reader. Logic Data sheets Series Component. Dual 4-input NOR gate. Quad 2 to 1 line mux Inverter.