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

runaway_pancake November 18, 2012, 12:59pm 10

themotorman:
I suddenly realized that I can arrange the 112 as a 7 x16 array...

That's 23 pins.

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