Help... PCF8574T (Expanding "Nano's" Digital Outputs) Answered
When I saw my RGB Chromatograph clock my teacher built from a kit I was so impressed with it I jumped the gun & ordered the parts so I could make one with an arduino version, I never thought much about it, thats so simple I could do in a few hours no problem except I overlooked one simple thing....
This clock uses six 10mm RGB Leds, two for the hour, two for the minutes & two for the seconds, each led has 3 inputs & 1 ground, thats a total of 18 outputs, thats not including a few other inputs used for status indicators, along with a few inputs for buttons, the problem is that a Nano doesnt have enough digital outputs & I completely overlooked that fact.
Anyways I started looking for I/O expanders when I realized that I have a few 1602 displays & PCF8574T backpacks, I have heard some people claim that it can be used to provide an additional 16 digital outputs, if true then it that would resolve my issue very easy
Has anyone done this? or example sketch how I could deploy the PCF8574 this way, for example a blink sketch that defines a pin on the PCF8574 as an outputs & turns on a LED connected to the pin
Thank you much...