12/28/2023 0 Comments Arduino radio clock![]() What Charlie Allen found, and Maxim Integrated later used in their products is that n 2-n LED can be driven with n pins. HIGH delivers the pin voltage, LOW delivers 0V or ground, while HI-Z acts as an input, or in our case "disconnected". ![]() In other words, the "DIGITAL" pins on an Arduino can be in three states: HIGH, LOW (Ground), or HI-IMPEDENCE (Input). So how do we connect the 30-something pins of our display to the 13 pins of our Arduino? Charlie Allen at Maxim Integrated is one of the people who came up with a solution with his namesake.ĬharliePlexing takes advantage of the "tri-state" ablity of these I/O boards. Since we aren't using any IC's, the situation is further complicated. CharliePlexingĪ problem that comes with using 4 seperate seven segment displays instead of a pre-packaged design is the number of pins that you have to handle. Next came the really hard part, the wiring, but before I show what I did, we should look at some theory. The power headers were taking up too much space and didn't allow me to slide the breadboard between the headers of the Arduino, making the whole assembly thinner. The first thing I did was remove the power headers from the breadboard and place my seven segment displays in the middle of the board. It is in fact, a SparkFun RedBoard which I got as part of my university's Intro to Electronics class, but it's basically an Uno clone. You might be thinking, "Hold up, that's not a Arduino Uno, its painted red!" and you'd be right. 100 Ohm Resistors, you can use any value you like, depends on how bright you want.
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