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⇤ ← Revision 1 as of 2015-02-23 14:09:27
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| '''NeoPixels can draw 60ma of current each at max brightness (full white). That means a 64 NeoPixel array could theoretically draw 3.6 Amps if you try and use it as a light bulb. Your computer USB port can only supply 500ma (USB2) or 1.5A (USB3). While computer USB ports are supposed to have internal protection in the case of too much current draw, I will not be held responsible if you somehow manage to fry your USB port! If you want to be safe, you can disconnect the white wire while you program the arduino, then reconnect it and use a USB power supply to test your program.''' | '''!NeoPixels can draw 60ma of current each at max brightness (full white). That means a 64 !NeoPixel array could theoretically draw 3.6 Amps if you try and use it as a light bulb. Your computer USB port can only supply 500ma (USB2) or 1.5A (USB3). While computer USB ports are supposed to have internal protection in the case of too much current draw, I will not be held responsible if you somehow manage to fry your USB port! If you want to be safe, you can disconnect the white wire while you program the arduino, then reconnect it and use a USB power supply to test your program.''' |
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| * The NeoPixel library includes a variant called NeoMatrix for driving grids of neopixels | * The !NeoPixel library includes a variant called !NeoMatrix for driving grids of neopixels |
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| * Conveniently, the NeoPixel Library comes with some built-in demos. In your Arduino IDE, go to ''File->Examples->Adafruit_NeoMatrix->matrixtest''. | * Conveniently, the !NeoPixel Library comes with some built-in demos. In your Arduino IDE, go to ''File->Examples->Adafruit_!NeoMatrix->matrixtest''. |
Use a 64 (8x8) NeoPixel Panel
NeoPixels can draw 60ma of current each at max brightness (full white). That means a 64 NeoPixel array could theoretically draw 3.6 Amps if you try and use it as a light bulb. Your computer USB port can only supply 500ma (USB2) or 1.5A (USB3). While computer USB ports are supposed to have internal protection in the case of too much current draw, I will not be held responsible if you somehow manage to fry your USB port! If you want to be safe, you can disconnect the white wire while you program the arduino, then reconnect it and use a USB power supply to test your program.
This setup is not soldered, it is connected with temporary jumpers. Please handle it carefully so the wires don't disconnect. Also, please note that this setup is also static sensitive.
- This task makes use of an Arduino Micro rather than the Pro Trinket, so make sure to set your IDE accordingly.
The NeoPixel library includes a variant called NeoMatrix for driving grids of neopixels
Conveniently, the NeoPixel Library comes with some built-in demos. In your Arduino IDE, go to File->Examples->Adafruit_NeoMatrix->matrixtest.
- The default program is configured for a 5x8 rather than an 8x8 array. Change the configuration.
The test program uses only a few pixels at a time, and should not have any power issues, even at full brightness. If you are concerned, you can adjust the setBrightness from 40 down to 20.
- Build and load the test program onto the Arduino.
Once you have this working, modify the program to do something interesting.
That's it, you're done. Nothing to turn in for this lab. You are welcome to try some of the other devices if you like.