I don’t get the space alien connection. Looks like a homework question.Two hints : product and chain rule. Undoubtedly, then, the emissions requirements became still more stringent, as evidenced by universal use of cats? Somewhere along these lines, in recent years, injection of fresh air into the exhaust gas stream disappeared (the “smog” pump) on the last 4 vehicles I have owned. It is for discovering that which is true and real. Originally Posted by river_rat Looks like a homework question.Two hints : product and chain rule. Hmmm….
For example, you could use 7 IO bits to select one of 128 outputs and then the 8th bit to turn the selected IO bit on or off. How many ports do you want?The Raspberry-Pi has up to 17 GPIO pins available: RPi Low-level peripherals – eLinux.orgIf you can’t find an existing device with enough GPIO pins, then you could see if there is some sort of “IO expander” module which will supply more (I would have thought this was quite a common requirement). Continue reading