I have 112 switches that output a 0 or 5 volts. I need a way to send this to an Arduino, MEGA2560 , by the serial port, using some CMOS logic or? so that I can tell which switches have changed state. Normal condition is that all 112 are HI=5 volts. Ideas please. The Arduino and the switches are abou…

112 switches need reading

MarkT November 18, 2012, 2:31am 5

How many will be LOW at any one time? Just a few or potentially many?

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