Electronic hardware

• Navy Electricity and Electronics Training Series
• https://hackaday.com/

FPGA

• https://opencores.org
• http://www.fpgaarcade.com/

Parts manufacturers/distributors/sellers

• https://www.mouser.com/
• https://www.digikey.ca
• https://www.jameco.com
• https://solarbotics.com/

Documentation

• http://www.alldatasheet.com/

Snippets

• data sheets can tell you what’s there, but omissions in data (eg ESD) can bite you

Fuses

Slow blow fuses:

• L - Low Breaking Capacity (ie glass)
• H - High Breaking Capacity (ie ceramic)

theory

Voltage

• symbol: V (sometimes E)
• measured in volts
• voltage is between 2 points

Current

• symbol: I
• measured in amps
• current is through a circuit

Arduino

http://ardx.org/src/code/

Raspberry Pi

Installing Fedora

• https://arm.fedoraproject.org/
• https://docs.fedoraproject.org/en-US/quick-docs/raspberry-pi/

dnf install -y fedora-arm-installer
fedora-arm-image-installer --image=</path/to/fedora_image> --target=<RPi_Version> --media=/dev/<sd_card_device> --resizefs

Pi 3

UART

• 115200 baud rate
• 3.3V logic

Because of a firmware issue, need to add this to /boot/config.txt:

enable_uart=1

See also the GH issue

Oracle Integrated LOM

Turn on indicator light

3.0

show /SYS/LOCATE
set /SYS/LOCATE value=Fast_Blink

Turn server off

stop /SYS

USB

Cable

• Red +5V power
• Black Ground
• White Data (-)
• Green Data (+)

RAID levels

Level	Data distribution	Performance	Space availability	Redundancy
0	Data is striped over multiple disks.	Higher read/write perf, since it’s split over disks	All disks are available as one pool	None - loss of one disk is catastrophic
1	Available disk is effectively halved.	Data is mirrored over multiple disks	Read performance increased since multiple blocks can be accessed at the same time. Write perf declines since data must be written twice	Loss of 1 disk is non-catastrophic
4	Data striped over multiple disks. Parity information on separate disk	Read operations benefit by striping. Writes are bottlenecked on the parity disk	More efficient use of data redundancy with parity disk	If parity disk is lost, data redundancy is lost
5	Data and parity striped over multiple disks	Read operations benefit by striping		Can only handle one disk failure before data loss
6	Data and dual parity blocks striped over multiple disks	Read operations benefit by striping		Can handle two disk failures before data loss
10	Hybridizing of 1 + 0, striping over mirrored sets	Read operations benefit by striping