The microcontroller uses Charlieplexing, a method of using I/O lines to drive as many as N× (N–1) LEDs, to drive 20 LEDs with only five I/O pins (references 2 through 4). Figure 1 Based on a low-cost ...

Straight-line graphs of logarithmic and exponential functions Watch this video to learn about straight line graphs of logarithmic and exponential functions.