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megabrite [2009/06/17 01:27]
macegr
megabrite [2015/05/21 20:49]
macegr
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-===== Introduction =====+===== MegaBrite =====
 {{megabrite_top.jpg?nolink  }} {{megabrite_top.jpg?nolink  }}
 [[http://macetech.com/store/index.php?main_page=product_info&cPath=1&products_id=9|MegaBrites]] have three 100mA red, green, and blue LEDs and a small controller chip, the Allegro A6281. The A6281 provides 10-bit PWM and 7-bit current control for each of the red, green, and blue LEDs. It uses a simple clocked serial interface to receive a 10-bit brightness value for each color, resulting in over a billion possible colors. Each input is buffered and output on the other side of the module. This allows each MegaBrite to repeat the signal to the next, allowing longer cable runs between elements without excessive loading of microcontroller I/O pins. [[http://macetech.com/store/index.php?main_page=product_info&cPath=1&products_id=9|MegaBrites]] have three 100mA red, green, and blue LEDs and a small controller chip, the Allegro A6281. The A6281 provides 10-bit PWM and 7-bit current control for each of the red, green, and blue LEDs. It uses a simple clocked serial interface to receive a 10-bit brightness value for each color, resulting in over a billion possible colors. Each input is buffered and output on the other side of the module. This allows each MegaBrite to repeat the signal to the next, allowing longer cable runs between elements without excessive loading of microcontroller I/O pins.
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 ^  LED Viewing Angle: | 140 Degrees  | ^  LED Viewing Angle: | 140 Degrees  |
 ^  Current: | 300mA maximum (all channels on)  | ^  Current: | 300mA maximum (all channels on)  |
-^  Power Supply: | 5.5V to 9V  |+^  Power Supply: | 5.5V to 9V DC |
 ^  PCB Size: | Hexagonal 1.2" largest dimension  | ^  PCB Size: | Hexagonal 1.2" largest dimension  |
 ^  Pin Spacing: | 0.1 inches  | ^  Pin Spacing: | 0.1 inches  |
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 ===== Power Connections ===== ===== Power Connections =====
 The **V+** and **GND** pins power both the LED and the control chip. A separate screw clamp terminal is also provided for a direct power connection, which is recommended to avoid problems caused by voltage drop along a chain of modules. MegaBrites require up to 300mA per module when all LEDs are active. The supply voltage should be kept between 5.5 and 9 volts. I have had good results with 6V and 7.5V power supplies. The **V+** and **GND** pins power both the LED and the control chip. A separate screw clamp terminal is also provided for a direct power connection, which is recommended to avoid problems caused by voltage drop along a chain of modules. MegaBrites require up to 300mA per module when all LEDs are active. The supply voltage should be kept between 5.5 and 9 volts. I have had good results with 6V and 7.5V power supplies.
 +
 +**As is true of most digital electronics, if you connect power backwards or short contacts with metal objects or other modules on the chain, you WILL destroy the logic chip. Please triple-check all cables and make sure the modules are not in contact with anything conductive BEFORE applying power.**
  
 ===== Data In / Data Out ===== ===== Data In / Data Out =====
/home/macetec/public_html/docs/data/pages/megabrite.txt ยท Last modified: 2015/05/21 20:49 by macegr