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Topic: more that 40 inputs (Read 874 times) previous topic - next topic

Axinar

hi,
i need something that is the oposite of the sift register. i want to measure if 40 pins are high or low using maximum 4 pins.
the frequency of the sample can be 1Hz or more! its not something that i need time aqurancy, i need just multply inputs!

thanks!
those who can,do.
those who can't, teach.
those who can't teach, admin.

robtillaart

have a look at the centipede shield - http://forum.arduino.cc/index.php?topic=7008.0 -

uses only 2 lines (I2C)
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

CrossRoads

Use shift-in registers vs shift-out registers.
Latch the state of the parallel inputs, then clock the data in.
74HC597
http://www.digikey.com/product-detail/en/CD74HC597E/296-26011-5-ND/1507407
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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