PiClock

Simple Clock for the Raspberry Pi, using OpenVG for its output

Checkout

Checkout this project by:

```shell
    # Install git if you don't already have it
sudo apt-get install git
    # Checkout the main project and it's submodules
git clone --recursive https://github.com/simonhyde/PiClock.git
```

Build

First you'll need to install some dependencies (ntpdate is only suggested for runtime):

sudo apt-get install libjpeg-dev ntpdate ttf-dejavu libboost-program-options-dev libboost-system-dev libssl-dev libmagick++-dev libb64-dev

Compile:
```
make
```
Run:
```
./piclock
```

Clock Unsynchronised

When ntp notices a large jump in time (such as when first booting up the Raspberry Pi), it tells clients it is not synchronised for quite a while (many minutes). To work around this, I run ntpdate to manually crash in the time whenever a new network connection is started up, closing down and then re-starting the main NTP daemon whilst this happens. To do this I have a slightly modified ntpdate script in if-up.d, you can install this update script by:

Make sure ntpdate is installed:
```
sudo apt-get install ntpdate
```

Copy in new script:

sudo cp if-up.d-ntpdate /etc/network/if-up.d/ntpdate

Running at startup

To configure this to run at startup, I did the following:

Add a new user to run the clock:

sudo adduser --disabled-password piclock
sudo usermod --append --groups spi,video piclock

Make the user profile run the clock:

sudo editor ~piclock/.bashrc

# And add a line to the end, something like: /home/pi/PiClock/piclock

Make the system auto-login as the piclock user:

sudo editor /etc/systemd/system/autologin@.service

and change:

```
ExecStart=-/sbin/agetty --autologin pi --noclear %I $TERM
```

to:

```
ExecStart=-/sbin/agetty --autologin piclock --noclear %I $TERM
```

Switching to Read Only SD Card