- Acquire Mirror π
- Boot setup
- Mirror π setup
Mirror π is a smart mirror built using a Raspberry Pi, inspired by Michael Teeuw's Magic Mirror.
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News about the Mirror π project will be posted on sidenote.hu under the tag Mirror π.
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This project, unless noted otherwise, is licensed under the MIT License. For the full license, see
LICENSE. Copyright © 2014 Istvan Szantai <szantaii at sidenote dot hu>.
Mirror π is built using a Raspberry Model B+, but the following instructions also apply to the Raspberry Pi Model B rev1 and the Raspberry Pi Model B rev2.
The following operating system and configuration is required:
Raspbian updated to the latest version with configured active internet access.
You can achieve this by running an update, and upgrade and a firmware update.
sudo apt-get update && sudo apt-get dist-upgrade -y && sudo rpi-update
Note that after a firmware update the Raspberry Pi needs to rebooted so the changes take in effect.
Boot to desktop enabled.
sudo raspi-configfrom the command line, and select Enable Boot to Desktop/Scratch → Desktop Log in as user 'pi' at the graphical desktop.
Correct timezone set.
sudo raspi-configfrom the command line, and select Internationalisation Options → Change Timezone, and select your timezone according to your location.
Enabled SSH server.
sudo raspi-configfrom the command line, and select Advanced Options → SSH, and enable the SSH server.
At least 128 MB of GPU RAM.
sudo raspi-configfrom the command line, and select Advanced Options → Memory Split, and give at least 128 MB of RAM to the GPU.
The following packages are necessary for Mirror π to fully function:
git“Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.” Mirror π's source code in maintained using Git on GitHub, therefore Git is needed to acquire Mirror π.
fbi“fbi displays the specified file(s) on the linux console using the framebuffer device.” fbi is needed so Mirror π can display a splash screen on boot.
python-gtk2This package contains modules that allow to use GTK+ in Python programs.
python-webkitThis package contains modules that allow using the WebKit browser engine in a Python/GTK+ application.
You can install the listed packages by entering the following to the command-line:
sudo apt-get install git fbi python-gtk2 python-webkit -y
Mirror π supports the use of an HC-SR501 passive infrared sensor (PIR sensor), which is used for motion detection. If Mirror π does not detect motion for a certain time it turns off the Raspberry Pi's HDMI output, this way sends the display into power sleep mode to save energy when no one is around. Also if the display is turned off to save power and motion is detected the Raspberry Pi's HDMI output is turned back on so all information is displayed again.
Note that the passive infrared sensor is an optional prerequisite, therefore parts of this document in connection with the usage of the sensor are marked with _
The following package is necessary to make the PIR sensor work with the Raspberry Pi.
python-rpi.gpioPython GPIO module for Raspberry Pi.
To install the
python-rpi.gpio package enter the following command into the command-line:
sudo apt-get install python-rpi.gpio -y
You can see the GPIO layout for Raspberry Pi Model B rev1, Raspberry Pi Model B rev2 and Raspberry Pi Model B+ in a single ASCII figure below.
+-----------+ | | 3V3 (Power) | ( 1) ( 2) | 5V (Power) | | rev1: GPIO0 (SDA0 I2C) | ( 3) ( 4) | 5V (Power) rev2: GPIO2 (SDA1 I2C) | | | | rev1: GPIO1 (SCL0 I2C) | ( 5) ( 6) | Ground rev2: GPIO3 (SCL1 I2C) | | | | GPIO4 | ( 7) ( 8) | GPIO14 (UART0_TXD) | | Ground | ( 8) (10) | GPIO15 (UART0_RXD) | | GPIO17 | (11) (12) | GPIO18 (PCM_CLK) | | rev1: GPIO21 | (13) (14) | Ground rev2: GPIO27 | | | | GPIO22 | (15) (16) | GPIO23 | | 3V3 (Power) | (17) (18) | GPIO24 | | GPIO10 (SPI0_MOSI) | (19) (20) | Ground | | GPIO9 (SPI0_MISO) | (21) (22) | GPIO25 | | GPIO11 (SPI0_SCLK) | (23) (24) | GPIO8 | | Ground | (25) (26) | GPIO7 | | Model B+ only below - - - - - - - - - - - +- - - - - -+ - - - - - - - - - - - - - - - - - - - - | | ID_SD (I2C ID EEPROM) | (27) (28) | ID_SC (I2C ID EEPROM) | | GPIO5 | (29) (30) | Ground | | GPIO6 | (31) (32) | GPIO12 | | GPIO13 | (33) (34) | Ground | | GPIO19 | (35) (36) | GPIO16 | | GPIO26 | (37) (38) | GPIO20 | | Ground | (39) (40) | GPIO21 | | +-----------+
The HC-SR501 sensor is connected to the Raspberry Pi GPIO pins as shown below.
+------------+ | PIR SENSOR | | (HC-SR501) | | | | +5V | ---------------------------------- Pin 2: 5V (Power) | | | Out | ------------------- Pin 26: GPIO7 | | | Ground | ---- Pin 6: Ground +------------+
Acquire Mirror π
To get Mirror π simply run the following command in the command-line:
git clone https://github.com/szantaii/mirror-pi.git
Note that the following instructions use the
pi user's home directory (
/home/pi) as the base directory for Mirror π. If you choose to clone Mirror π to a different location make sure you enter the proper paths when using the following commands in the next sections. Also the startup/mirror-pi.desktop file contains Mirror π's absolute path, so if you cloned Mirror π into another location than the
pi user's home directory you must edit this file also so it would contain the proper path.
In this section we will go through the boot process setup of Mirror π.
By applying the following settings boot logs and splash screens will be hidden.
Remove the following option from the exisitng kernel options:
console=tty1By removing this option the output will not be written to
Add the following options to the existing kernel options:
loglevel=3Only kernel messages with severity 3 or smaller will be logged to the console (KERN_ERR, KERN_CRIT, KERN_ALERT, KERN_EMERG).
logo.nologoDisables display of the built-in Raspberry Pi logo.
vt.global_cursor_default=00 will hide cursor, 1 will display it.
quietDisables most log messages.
You can add and remove the described options manually (advisable to create a backup of the original kernel options file) or use the following command:
sudo sed -i.bak 's/console=tty1/loglevel=3 logo.nologo vt.global_cursor_default=0 quiet/' /boot/cmdline.txt
Raspberry Pi configuration
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It is advisable to create a backup of the original Raspberry Pi specific options file.
sudo cp /boot/config.txt /boot/config.txt.bak
hdmi_force_hotplug=1Use HDMI mode even if no HDMI monitor is detected.
config_hdmi_boost=4Configure the signal strength of the HDMI interface. (Default is 0. Try 4 if you have interference issues with hdmi. 7 is the maximum.)
display_rotate=3Rotates the display 270 degrees clockwise on the screen.
disable_splash=1If set to 1, disables the rainbow splash screen on boot.
Enable the Mirror π by adding the
bootsplash service to the system in four steps:
Add execution rights to the
chmod a+x /home/pi/mirror-pi/startup/bootsplash.sh
Add a symbolic link of the service script to
sudo ln -s /home/pi/mirror-pi/startup/bootsplash.sh /etc/init.d/bootsplash.sh
Enable the installed system init script by reading the comment header of the script.
sudo insserv /etc/init.d/bootsplash.sh
bootsplashservice start on system startup.
sudo update-rc.d bootsplash.sh start
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sudo sed -i.bak 's/^/#/' /etc/xdg/lxsession/LXDE/autostart
mkdir -p /home/pi/.config/autostart ln -s /home/pi/mirror-pi/startup/mirror-pi.desktop /home/pi/.config/autostart/mirror-pi.desktop
sudo sed -i.bak 's/^#xserver-command=X$/xserver-command=X -s 0 -dpms -nocursor/' /etc/lightdm/lightdm.conf
Mirror π setup