IoT For Makers

This document is derived from my book , “ Raspberry Pi for Makers " I'm using a Raspberry Pi 3 and python 2.7. 8X8 Dot matrix is ​​an array of LED elements horizontally and vertically. It has 64 LED elements. There are many types, from monochrome to RGB. Many easy-to-use display driver modules are also available. LED metrix has a much brighter screen than LCD or OLED. So showing this can be useful when the amount of information is small. <8X8 Dot Matrix with MAX7219 Driver                     8X8 Dot Matrix> The easiest way to use the dot matrix is ​​to use the display driver for the matrix. This driver can controll the dot matrix using shift registers. Shift registers typically communicate with Arduino or Raspberry Pi using serial communications such as SPI, UART, or I2C. Adafruit also recommends using the 74HC595 or TPIC6B595 shift registers (both manufactured by Texas Instruments) or the MAX7219 LED...

This document is derived from TI's LED engineer Masashi Nogawa, “ How-to design LED signage and LED matrix displays Part3 " These docuements are very useful to understand a LED Matrix. Part 1 of this three-part series introduced the technical and engineering steps necessary to design an LED display system from individual LED lamps. Part 2 provided the remaining steps needed to implement a basic LED display. In the third and concluding installment of this tutorial, we'll explore some of the issues which affect the image quality and reliability of LED displays. We'll also become acquainted with the technologies and design techniques commonly used to deal with them.   Anti-ghosting/ghost-canceling/pre-charge FETs Ghosting, spike noise, or phantom noise are unwanted lighting effects caused by Anode gate “float” which can occur in time-multiplexed LED driver. Since LED lamps (PN junction of diodes) have relatively high levels of capacitance, their resi...

This document is derived from TI's LED engineer Masashi Nogawa, “ How-to design LED signage and LED matrix displays Part2 " These docuements are very useful to understand a LED Matrix. LED signage and matrix displays are an integral part of the 21st century landscape. Their quality is becoming so good that it's becoming increasingly difficult to distinguish LED images from traditional billboards. Part 1 of this three-part series addressed the technical and engineering steps necessary to design an LED display system from individual LED lamps. In Part 2 we'll visit the remaining necessary steps to complete the LED system. This will lay the groundwork for Part 3 which will introduce several important features becoming commonly available on advanced LED display driver ICs, as well as tips on how to make best use of them. How to transfer display data To begin, let’s review how data is transferred between the image processing controller and the LED dri...

This document is derived from TI's LED engineer Masashi Nogawa, “ How-to design LED signage and LED matrix displays Part1" These docuements are very useful to understand a LED Matrix. He is an engineer working in LED control at Texas Instruments. Therefore, he occasionally mentions TI's LED driver, which is required for large LED display production. However, the document contains information that will be of great help to those interested in making displays using the LED Matrix. LED-based signage and matrix displays are bringing new dimensions of versatility and eye-pleasing visual effects to a growing number of outdoor and indoor applications. Recent advances in LED technology have even made it difficult to distinguish still images on their high-quality displays from traditional printed or painted billboards. In this tutorial, Texas Instruments takes a detailed look at the essential technical principles of LED display systems and the engineering considerations...