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 ...

One of the nicest amenities of interpreted programming languages is that you can test out the code that you’re developing in a shell, one line at a time, and see the results instantly. No mat… ...

Microcontrollers existed before the Arduino, and a device that anyone could program and blink an LED existed before the first Maker Faire.This might come as a surprise to some, but for others PICs ...

The moving-dot display has some benefits over the bar-graph display: It better indicates the location of a detected object in sonar and radar applications; it needs only one LED’s current-limiting ...

This article is part of the Ideas for Design Series: Vol. 3, No. 10. If the need arises to display measurements in both graphical and digital formats, an LED matrix display offers one of the best ...