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Review: 4-digit 7-segment LED and RTC from Adafruit In this review, I thought I would combine Adafruit's 0.56" 7-segment   LED backpack and display  and their   DS1307 RTC (Real Time Clock) board . The obvious choice for such a combination is to make a simple clock! Note that my pictures make the display look a little washed out. It wasn't,  it was very bright . This is juts an effect of my photography lighting setup being even brighter. Both modules are I2C and therefore just require two data pins along with GND and 5V. So, for anyone who has done their own multi-digit 7-segment LED multiplexing wiring up the breadboard becomes beautifully simple. 0.56" 7-Segment Backpack and Display This comes as a kit of parts that need to be soldered together. Well actually just the PCB, header pins and the LED display itself. The surface mount chip is already soldered for you.  Beginners will have no trouble with this, and Adafruit provid...