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Making your Open Pi Image System

The Hardware

You will need:

  1. Raspberry Pi 2 Model B
  2. 64 Gb memory card
  3. External HD / USB Stick
  4. 2x WiFi dongles
  5. HDMI monitor and cable
  6. USB mouse and keyboard
  7. Some other computer and a memory card reader
  8. PiNoir camera module and cable
  9. Wireless internet access

Starting up the Pi

  1. You will first need to put an operating system on the SD card, we will use Raspbian. The whole process is described at the Raspberry Pi site https://www.raspberrypi.org/documentation/installation/installing-images/, so please follow those instructions. Make sure to flash the SD card with the JESSIE version of Raspbian (2015-11-21).
  2. Now plug in the monitor, keyboard, PiNoir camera and both WiFi dongles to the Pi. Then plug in the power supply, the Pi should start up.

Expand the filesystem

  1. We will eventually install a lot of software. So let's make the Pi use the whole memory card. Expand the filesystem using the Pi's System Preferences program. Go to the Menu button at the top left corner of the Pi Deskyop
  2. Menu -> Preferences -> Raspberry Pi Configuration -> System tab -> Expand filesystem - click ok
  3. Menu -> Preferences -> Raspberry Pi Configuration -> Interfaces tab -> Camera Enable - click ok, agree to reboot
  4. If the system hasn't rebooted automatically - Menu -> Shutdown -> Reboot

Connect the Pi to the internet.

To set everything up, we need a basic internet connection. Here are wireless instructions, you can use a wired ethernet connection if you like.

  1. Use the WiFi configuration panel (in the top right of the screen, under the WiFi symbol, click and select wlan0 to select the wireless network to connect to).

Update system software

Now we need to make sure that the Pi's internal software is up to date. We'll use apt-get - the Raspbian software package manager. Open a Terminal by clicking the Terminal program icon at the top of the screen, you should get a black window to type into. Type

sudo apt-get update

and the software should update automatically.

The Pi should now be in its basic state and we're ready to go ahead with the stuff for Open Pi Image.

The software

Now we need to setup the wireless software to access the Pi remotely and the Open Pi Image software to actually do stuff!

Setup wireless access point

We'll get the automatic script from github and run that.

  1. In the terminal window, type git clone git://github.com/TeamMacLean/install_opimage
  2. Then type cd install_opimage
  3. Then type make ap

This will setup the wireless access point. You need to answer some questions about your local network. If you don't know the answers, use the suggested defaults and keep your fingers crossed. Here are the questions you'll be asked with suggested answers (we will try to make this step automatic in the future):

  1. Qn 0) Do you accept above terms? - press y to accept.
  2. Qn 1) Please provide your new SSID to be broadcasted by RPi - The name of the network your Pi will create, try TheRPi
  3. Qn 2) Please provide password for your new wireless network (8-63 characters) - The password to access this new network, try raspberry
  4. Qn 3) This one is dependent on the hardware of your dongles, it may not be asked - Some of the WiFi chipset require special version of hostapd. Please answer yes if you want to have different version of hostapd downloaded. type yes to answer yes.
  5. Qn 4) You have more than one wlan interface. Please select the interface to become AP - use wlan1 so PRESS 2 dont type wlan1
  6. Qn 5) Please provide network interface that will be used as WAN connection - if you intend to use a wireless connection to connect to the internet, type wlan0 - it is possible to setup a wired connection here by typing eth0 if you wish.
  7. Qn 6) Please provide your new AP network (i.e. 192.168.10.X). Remember to put X at the end!!! - this is the address of the subnet your Pi will work on. Assuming that there aren't already machines with this range of IP's locally type - 10.10.10.X
  8. Qn 7) You will see a summary of the information provided, type Y to confirm
  9. Qn 8) Would you like to start AP on boot? (y/n) - type y to agree

Once done, the Pi will need rebooting, so do that and when it starts again check all went well, use a phone or laptop to check local WiFi networks, you should see one called TheRpi (or whatever you called it in Qn 1, above). If it is there you can carry on with installing Open Pi Image

Setup Open Pi Image and dependencies

Re-open the terminal and

  1. Type cd install_opimage
  2. Then type make software

The opimage setup process should now begin, there is a lot to do so it will take a long time (~ 1hr, and you will need to confirm some steps so check at intervals).

Once this step is done, you should have a folder on your Desktop called opimage_interface. Attach an external storage device (like a USB stick or external HD, and drag the opimage_interface folder to that. The Pi is now ready to be disconnected from your keyboard and monitor and placed in situ. Go and do that, you won't need a mouse or keyboard or monitor for the following steps, but you will need a laptop with wifi and the storage device you just used.

Connect to Pi over its wireless and start the interface

Once the Pi is in its work place, plugged in and the storage is connected to the Pi, use your laptop to make sure you can see the

  1. Connect to the TheRpi network using your laptop, and the password chosen above (raspberry)
  2. Open a terminal on your laptop and log on using ssh pi@10.10.10.1 (you are connecting as the pi default user so the password is raspberry no matter what you called the wireless network)
  3. Type cd /media/pi - this is the place on the filesystem to which Pi's mount external storage media.
  4. Type ls - a list of mounted storage devices should appear, hopefully just one. Note the name of yours
  5. Type cd <name of your storage device>
  6. Type ls - you should see the files and folders on your storage device
  7. Type cd opimage_interface
  8. Type nohup python -m CGIHTTPServer 8000 &

The interface should start on port 8000. You can reach the web interface by going to the address http://10.10.10.1:8000 on the laptop connected to the Pi's wireless.

You can safely close the terminal windows and disconnect from the Pi, the server will continue to run.

Re-connect to a running Pi over its wireless

  1. Connect to the TheRpi network using your laptop, and the password chosen above (raspberry)
  2. You can reach the web interface by going to the address http://10.10.10.1:8000 on the laptop

Checking run progress in the interface

  1. Once you have started image collection, you can see progress by clicking a job's work folder link. You'll get a listing of what is in that folder - each timepoint should have a .jpg preview and a larger .data raw file.

Stopping jobs in the interface

  1. Clicking stop will kill the job, but wont remove it from the interface listing - it will show up as dead
  2. Clicking remove will delete a job from the interface listing but will not delete any files from the storage
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