✎ Raspberry Pi [ПромАвтоматика]

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====== Raspberry Pi ======

===== install raspbian =====
https://www.raspberrypi.org/documentation/installation/installing-images/linux.md
  df -h
  sudo umount /dev/sdb1
  sudo dd bs=4M if=2015-11-21-raspbian-jessie.img of=/dev/sdb
  sudo dd bs=4M if=/dev/sdb of=from-sd-card.img
  truncate --reference 2015-11-21-raspbian-jessie.img from-sd-card.img
  diff -s from-sd-card.img 2015-11-21-raspbian-jessie.img
  sync


===== initial setup =====
  sudo raspi-config

user: ''pi''\\
pass: ''raspberry''
 
===== keyboard =====
''/etc/default/keyboard'':
  XKBLAYOUT="us"
  

===== temperature =====
<code bash>
#!/bin/bash
cpuTemp0=$(cat /sys/class/thermal/thermal_zone0/temp)
cpuTemp1=$(($cpuTemp0/1000))
cpuTemp2=$(($cpuTemp0/100))
cpuTempM=$(($cpuTemp2 % $cpuTemp1))

echo CPU temp"="$cpuTemp1"."$cpuTempM"'C"
echo GPU $(/opt/vc/bin/vcgencmd measure_temp)
</code>

===== wifi =====
  sudo iwlist wlan0 scan|more
''sudo nano /etc/network/interfaces''
  allow-hotplug wlan0
  iface wlan0 inet dhcp
  wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
  iface default inet dhcp

''sudo nano /etc/wpa_supplicant/wpa_supplicant.conf''
  ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
  update_config=1
  network={
    ssid="YOURSSID"
    psk="YOURPASSWORD"
  }

  sudo ifdown wlan0
  sudo ifup wlan0

===== jdk =====
http://www.rpiblog.com/2014/03/installing-oracle-jdk-8-on-raspberry-pi.html

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

download ''jdk-8-linux-arm-vfp-hflt.tar.gz for Linux ARM v6/v7 Hard Float ABI''

  sudo tar zxvf jdk-8-linux-arm-vfp-hflt.tar.gz -C /opt
  sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0/bin/javac 1
  sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0/bin/java 1
  sudo update-alternatives --config javac
  sudo update-alternatives --config java
  java -version
  javac -version