= RaspberryPi =
 * Kit in https://www.chiptec.net/pcs-e-mobilidade/computadores/raspberrypi/kit-raspberry-pi-3-modelo-b-noobs-caixa-carregador-preto.html
 * Access GPIO https://elinux.org/RPi_GPIO_Code_Samples#C
 * https://elinux.org/RPi_GPIO_Code_Samples#sysfs

== BCM2835 ==
 * Timers
 * Interrupt controller
 * GPIO
 * USB
 * PCM / I2S
 * DMA controller
 * I2C master
 * I2C / SPI slave
 * SPI0, SPI1, SPI2
 * PWM
 * UART0, UART1

== Install and configure screensaver and lock screen==
 * sudo apt-get install xscreensaver
 * Preferences, Screen saver
 * Auto lock after 2 minutes
 * Create new menu item (Preferences, Main menu editor)
  * Menu item name Lock
  * Command: xscreensaver-comand -lock
  * Icon: /usr/share/lxpanel/images/ns-lock.png