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|-valign="top"
 
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|diodes
 
|diodes
|When you need current one way, not the other. See [[Transistors, Diodes, etc.]] for details.
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|When you need current one way, not the other.
 
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* ''(FIXME: isn't this already too many? Trim.)''
 
* ''(FIXME: isn't this already too many? Trim.)''
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* If you use a microcontroller in your project, the counters inside that microcontroller will probably be all the counters you need.
 
* If you use a microcontroller in your project, the counters inside that microcontroller will probably be all the counters you need.
  
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*?
 
  
 
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|Shift registers
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Shift registers
 
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Often used to expand the number of ports.
 
 
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*?
 
*?
* 74HC595 -- for more output pins. SIPO eight bit shift register with output latch. Perfect for letting the propeller clock [[POV display]] slowly clock in the next value, then LOAD them all at once. Near the bottom of the page describing the [http://www.robotroom.com/Tach.html "Digital Numeric LED Displays Tachometer (RPMs), Temperature, and Counter"] project, David Cook says: "The 595 is a great 8-bit serial chip because data can be shifted in without affecting the existing output. All new data is then switched over at the same time. The 595 can also be daisy chained. In this case, 48 outputs are controlled with only three wires (data, clock, and latch)."
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* 74HC595 eight bit shift register with output latch. SIPO. Perfect for letting the propeller clock [[POV display]] slowly clock in the next value, then LOAD them all at once. Near the bottom of the page describing the [http://www.robotroom.com/Tach.html "Digital Numeric LED Displays Tachometer (RPMs), Temperature, and Counter"] project, David Cook says: "The 595 is a great 8-bit serial chip because data can be shifted in without affecting the existing output. All new data is then switched over at the same time. The 595 can also be daisy chained. In this case, 48 outputs are controlled with only three wires (data, clock, and latch)."
* 74HC166 -- for more input pins. PISO 8-bit parallel-load shift registers.
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* 74HC166 - 8-bit parallel-load shift registers -- PISO.
* 74HC165 -- for more input pins. PISO 8-bit parallel-load shift registers.
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|-valign="top"
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|Shift registers
  
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Often used to expand the number of ports, I need a bit more research here.
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* 74HC595 -- for more output pins
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* 74HC165 -- for more input pins
 
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