Modifications

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   |text= 1.2" 8x8 Matrix Created by Ladyada

   |text= Cette version du BackPack LED est conçu pour des matrices 8x8 LEDs (30mm de côté). Comme ces matrices ne font que 30mm x 30mm, ce serait une horreur de devoir utiliser un ensemble massif de composant pour les contrôler. Ce backpack résout l'ennuyeux problème d'avoir 16 broches/pins disponible sur son microcontroleur... ainsi que les composants nécessaire pour assurer une alimentation à courant constant (pour avoir un éclairage homogène des LEDs). Ce backpack propose le tout dans un seul composant et dispose en plus d'une interface I2C. Il est tellement petit qu'il tient derrière la carte et prend soin de tout, est capable de contrôler 64 LEDs (en tâche de fond), en n'utilisant que deux broches du microcontroleur (pour le bus I2C).

This version of the LED backpack is designed for the 1.2" 8x8 matrices. They measure only 1.2"x1.2" so its a shame to use a massive array of chips to control it. This backpack solves the annoyance of using 16 pins or a bunch of chips by having an I2C constant-current matrix controller sit neatly on the back of the PCB. The controller chip takes care of everything, drawing all 64 LEDs in the background. All you have to do is write data to it using the 2-pin I2C interface. There are two address select pins so you can select one of 8 addresses to control up to 8 of these on a single 2-pin I2C bus (as well as whatever other I2C chips or sensors you like). The driver chip can 'dim' the entire display from 1/16 brightness up to full brightness in 1/16th steps. It cannot dim individual LEDs, only the entire display at once.

 

********************************************. All you have to do is write data to it using the 2-pin I2C interface. There are two address select pins so you can select one of 8 addresses to control up to 8 of these on a single 2-pin I2C bus (as well as whatever other I2C chips or sensors you like). The driver chip can 'dim' the entire display from 1/16 brightness up to full brightness in 1/16th steps. It cannot dim individual LEDs, only the entire display at once.

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