LCD and Final Configuration

If you haven’t already assembled the LCD Pi Plate, do that step now. Here’s a tutorial to guide you through the assembly.

Raspberry Pi Model A users:
the LCD Pi Plate is normally assembled with a rubber bumper near one corner for stability atop the Raspberry Pi. This bumper rests on the Ethernet jack, which is only present on the Model B board. Model A users will need to find a suitable alternative to the bumper, non-conductive and about 5/8" tall. A cork or rubber eraser trimmed to size can work, a 5/8" nylon PC board spacer if you have one, or a 2x2 Lego® brick set on its side.
The Raspberry Pi should be shut down when connecting the LCD and installing in a case. If it’s currently running, issue the shutdown command as shown at the bottom of the previous page.
If using the Pi Box case, follow this tutorial to install the Raspberry Pi inside, leaving the top of the case off.

Align the 26-pin headers on the LCD plate and Raspberry Pi, and install the plate by pressing straight down gently.

Connect power to the Raspberry Pi. The red power light should come on. If not, there might be a soldering mistake on the LCD Pi Plate board.

Allow 30 seconds to a minute for the Raspberry Pi to fully boot and situate itself on the network. At this point, you should be able to log in from a terminal over ssh, e.g.:

ssh [email protected] (or whatever address the system reported during the configuration process)

If you previously installed netatalk (optional), and if you changed the Raspberry Pi’s default hostname, you might be able to use:

ssh [email protected]
If you receive a response that the connection timed out or the hostname cannot be resolved, connect a monitor and keyboard and work through the “Initial System Configuration” steps again; it’s most likely a typo in the wireless setup.
You should be successfully logged into the system at this point.

First, let’s test the LCD and buttons:

cd Python-WiFi-Radio
sudo python Adafruit_CharLCDPlate.py

If using an RGB-backlit LCD, the program should cycle through different backlight colors (with the Blue & White LCD, it will flash on and off a few times). Then it will ask you to try pressing buttons.

Adjust the Contrast dial (using a small screwdriver if necessary) until the text is sharp and legible.

When finished, press Control+C to exit. The LCD is ready!

Next, let’s try our radio software:

sudo python PiPhi.py

This is our own “wrapper” for pianobar, allowing us to use the LCD and buttons to interact with that program. If all goes well, the system should report its network address, fetch a list of stations from the Pandora server and start playing. If not, refer to the Troubleshooting page.

With only a few buttons available, we’ve condensed only the most essential functions to this program. If you need to configure your Pandora account (such as adding new stations to the list), use a web browser to access the Pandora web site.

From left to right, the button functions are:

  • Play/Pause (tap once to pause, again to play, or hold for three seconds to exit the program).
  • Station select (brings up a menu — can then use the up and down buttons to pick a station — press this button again to activate, or the Play/Pause button to cancel).
  • Volume Up/Down (two buttons, one above the other)
  • Next Track

Take a moment to experiment with the buttons and familiarize yourself with their use. If everything seems to be working, we’ll do some final configuration to make the system truly standalone. To exit from the PiPhi program, hold down Select (the leftmost button) for 3+ seconds.

Recent builds of pianobar seem resistant to quitting when the PiPhi.py script exits. If that occurs — if music is still playing even though you’ve quit the program — type:

sudo killall pianobar

This is only a potential issue during testing — once it’s set up as a fully standalone device with auto-start and shutdown, you shouldn't experience this problem.

Final Configuration and Auto-Start

First, cd to the directory with the PiPhi.py script (you should already be there if you've followed the steps till now!) and edit the PiPhi.py script:

nano PiPhi.py

Two lines near the start of the code (around line 26) are of interest:
RGB_LCD      = False # Set to 'True' if using color backlit LCD
HALT_ON_EXIT = False # Set to 'True' to shut down system when exiting
If you’ve opted for an RGB-backlit LCD, change the first of these lines to:
RGB_LCD = True
Since our goal is a standalone system with no keyboard or monitor, we need some way to issue an orderly shutdown (Linux systems don’t like it when you just pull the plug). To make the 3-second button press shut down the system (rather than just exit to a command line prompt), change the second line to:
HALT_ON_EXIT = True
Nearly there! Now we just need to set up the system to start our program upon booting.

sudo nano /etc/rc.local

Before the final “exit 0” line, insert these two lines:
cd /home/pi/Python-WiFi-Radio
python PiPhi.py &
If you downloaded or otherwise placed the radio software in a different location, the first line should be changed accordingly. “sudo” isn’t necessary here because the rc.local script is already run as root.

Reboot the system to test the startup function:

sudo reboot

After 30 seconds to a minute, you should see the backlight turn on and music will begin. If not, connect to the system using ssh and confirm the configuration steps above.
Last updated on 2016-05-02 at 08.01.17 PM Published on 2013-04-12 at 12.02.45 PM