Linux on a USB and Sound Controlled LED
Why you should understand DNS, make a bootable Linux OS on a USB, and control a string of LED's using TIP31 transistors.
Check out our transcripts.
Making a Bootable Linux USB Drive
Step 1: Get a USB Drive
- You'll need a USB flash drive of at least 2GB or more.
- Format the USB Drive by using Disk Utility and use MS-DOS (FAT)
Step 2: Download the USB Loader
- Go to Seven Bits Mac-Linux USB Loader to download the software.
- Download the Distribution of Linux of your choice, I chose Ubuntu
- Create Live USB
**This process should only take about ten to fifteen minutes.
Step 3: Reboot
- Reboot your Mac, on startup when you hear the "chime" hold the "alt / option" key to choose your boot method
- Select your USB Drive, press 1 to load Linux.
- Congrats you have a portable USB OS!
LED lights & TIP31 Transistors
* LED stands for "Light Emitting Diode"
* Diodes only allow current to pass in one direction - positive to negative
* LEDs are low-cost, efficient light sources
* SMD (Surface Mount) LEDs can be found in rolls backed with adhesive
* It's a NPN (Negative-Positive-Negative) bipolar junctions used for medium power applications.
* We're using a TIP31C -- which is capable of 100v and 40 Watts
* Pin 1 and 3 are a junction. Used by a lower-power circuit.
* Pin 2 and 3 is a semi-conductive pathway.
* When a charge passes between junction 1 and 3, it allows a charge to pass between 2 and 3.
* Where this becomes useful is that the charge passing between pin 1 and 3 can be small while the charge passing between pin 2 and 3 can be large.
** The voltage from the headphone hack of a media play is 1-2 volts, perhaps 20ma. That would never be enough to drive a LED strip.
** HOWEVER... we can use that small current between pins 1 and 3, to trigger a much larger current between pins 2 and 3.
** If pins 2 and 3 are the negative side of a 12 volt, 2 amp circuit, then we've just created something useful!
Sound-Sensitive LED Lights
- 1 x Blue SMD LED Strip - 12v
- 2 x Red SMD LED Strip - 12v
- 2 x TIP31C Transistor
- 1 x 3.5mm Stereo Plug
- 1 x Heat Shrink Tubing
- 1 x 25ft Length of 20ga black/red wire
- 12v Power Source
- Soldering Iron
- Wire Stripper/Clipper
- "Helping Hands"
- Needle-nose Pliers
Dancing LED Schematic
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