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Speaking of Pi
The tiny Raspberry Pi is a convenient and unobtrusive tool for serving up slide shows.
I've always wanted to bring just a little box to a presentation, plug it in to the projector, and start talking. Why tote a bulky laptop? Or, what if you want to do something else with your laptop, like search for supporting documents while you are in the middle of your talk? Off-loading your presentation to a Raspberry Pi simplifies logistics and saves podium space.
My presentations regularly discuss small components, printed circuit boards, and electronics modules, and I like to show those devices to the audience as I point out important features and give commentary. So, I built a small device to show both slides and views of these electronic components in real time. In this article I show how I built my Raspberry Pi presentation machine.
The Concept
The Raspberry Pi has an HDMI output that will connect to most modern slide projectors of big-screen TVs. I'll also use a webcam – in this case, a Logitech C310 webcam – to capture live video of the components I'm describing in my presentation. In a more conventional setting, the video camera might point at the speaker or at some event or procedure that the speaker is describing. Of course, my Pi also needs a monitor, keyboard, mouse, and a reliable USB hub (see the 'Hardware Configuration' box for more details).
Raspberry Pi model B [3], with 512MB RAM, two USB ports, and 100MB Ethernet running on a 5-volt, 1-amp wall wart. An HDMI port is hooked up to a Sanyo DP42841 42-inch 1080p LCD big screen TV as a monitor. The idea is to hook up the presentation machine to an HDMI projector at events.
Edimax EW-7811Un 150Mbps wireless 11n nano-sized USB adapter
Logitech HD webcam model C310
Cables Unlimited USB2.0 four-port-powered hub, which has its own 5V at 1-amp wall wart
2GB USB stick containing the Impress presentation
Logitech USB mouse
Standard USB keyboard
SanDisk Ultra II 15MBps, 4GB SD card
The rest of the ingredients are all software, including:
- LibreOffice Impress [1] – The slide presentation tool built into the free LibreOffice suite, which is available for download from the Raspbian repositories
- GUVCView [2] – A tool used for capturing webcam video and rendering it to a form the Raspberry Pi can channel
As I'll show in this article, my solution also depends on the power of the Pi to support multiple desktops. Figure 1 shows my prototype presentation machine.
The Raspberry Pi Setup
The software described in this article runs on nearly any Raspberry Pi Linux. I used Raspbian [4] because I like the simple, uncluttered look of its desktop (see the 'Software Configuration' box for more). If you haven't done so already, download Raspbian and burn it to an SD card, plug the SD card into the slot on the Raspberry Pi – make sure everything is connected properly, including your keyboard, mouse, WiFi USB adapter, and the powered USB hub – then, turn on your projector or big screen TV and power up the Raspberry Pi.
Raspbian – Debian Wheezy
Version: January 2014
Release date: 2014-01-07
Default user/password: pi/raspberry changed to <xxxxxxx>
URL: www.raspbian.org
Kernel version: 3.10
After the Raspberry Pi boots, raspi-config starts automatically, and you can do the initial configuration. When you select Expand Filesystem, a pop-up dialog appears labeled Root partition is resized. Select OK. Next, in the Change Password pop-up, type OK and enter a new password. Select Enable Boot to Desktop/Scratch.
Because video streaming is a resource-intensive task for a little computer, I chose to overclock my Pi for the maximum performance. Select Overclock and up the clock speed to 1GHz, 500MHz core speed, 600MHz SDRAM speed, and 6 overvolts. Type Finish then click Yes to reboot. Log in as pi with the password you set up earlier at the graphical login screen.
Once the desktop appears on the Raspberry Pi screen, click the WiFi Config icon to bring up the wpa_gui window and click the Scan button to look for your LAN. Double-click your LAN under the scan results and click the Add button on the pop-up screen. Finally, click the Connect button on the wpa_gui screen before closing the window. You'll need the WiFi connection to download and install LibreOffice Impress and the GUVCView software.
You might have to monkey around with your router settings to get the Raspberry Pi to connect to your network, particularly if you run encryption, access point authentication, and other safeguards. Of course, you could also use a wired Internet connection to download the software.
I hacked the Logitech web camera to get access to the focus ring. I needed to adjust the focus down to about 4 inches. The Logitech C270 focus adjustment tutorial [5] showed how to remove the glue spot securing the focus ring: unscrew the lens for closer focus; screw in the lens to focus at infinity.
For the initial testing, I rested the C310 on a table, pointing the camera at a spare Arduino balanced on edge with a white sheet of paper for a backdrop (see Figure 2). Some type of stand, possibly with a few white LED lights, will give me a steadier image and is on the to-do list.
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AdoPiSoft Basic Setup with Raspberry Pi 3
This is a basic guide on how to flash AdoPiSoft software into Raspberry Pi 3 Model B/B+ and have a working coin-operated wifi hotspot machine. You can also use this guide to reformat your old machine and install our latest image.
If you want a production-ready wifi hotspot machine, please contact the distributors.
Step 1: Prepare the materials needed
If you don't have the coin acceptor yet, you can still proceed to install the software and configure your wifi vending machine as long as you have araspberry pi,power supply(for raspberry pi) and amicro SD card. You won't be able to test the payment functionality though.
- Raspberry Pi 3 Model B or B+
- Universal Coinslot / Multi-coin Acceptor
Others
- 4GB (or higher) Micro SD Card - class 6 or 10 (important)
- Micro SD Card Reader
Important: The micro SD card must be of high quality. Use Sandisk Ultra or Samsung Evo
- Raspberry Power Supply
12 Volts DC Power Supply
12V DC at least 1A output power supply.
This is used to power the coin acceptor. You must identify the positive and ground terminal using voltmeter.
Step 2: Software Installation
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Needed softwares:
- Download and install Etcher to your computer.
- Download Ado Piso WiFi Raspbian Image
After downloading the needed softwares, we need to flash the installer into the midro SD card using Etcher. To do so, unzip the contents ofadopisowifi.zip
Insert the micro SD card into the your computer using a card reader.
Open Etcher and click Select Image.
Then select adopisowifi-(version).img from the zip file.
Make sure to select your micro SD card
Click the Flash! button and wait for the process to finish.
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If you encounter prompts about formatting your sd card, just click Cancel.
Step 3: Configure The Machine
IMPORTANT:
Make sure you do the following before turning on the raspberry:
- Insert the SD card into the raspberry sd slot.
- Insert the LAN cable into the ethernet port of raspberry pi and make sure it is connected to internet
Note: You don't have to insert a monitor to the HDMI port.
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Turn on the raspberry pi and wait for the AdoPisoWifi WiFi network to appear, it may take a couple of minutes.
Connect to the wifi network using your laptop or smartphone. Once connected, open a browser and go to http://10.0.0.1/admin
username:admin
password:admin
(The machine is also accessible in your ethernet using its WAN IP.)
Step 4: Connecting All Components
Connect all the connections base on the circuit diagram. Make sure to check the positive ang negative terminal of the 12V DC power supply for the coinslot to work properly.
Step 5: Update the Software
Software is constantly being improved, you need to update the software after installation to get the latest features. To update the software, go to the admin settings and navigate to Device section. Then click the Check For Updates button at the bottom of the page. Then click for Install Updates button.
Join our Community
We have a lot of users that have already created a machine using our software. Join our discussions and see what others are doing with their wifi vending machines.
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Note:
Raspberry will use it's built-in wifi module to broadcast the SSID. But its signal is very weak and recommended only for testing purposes. It is best to upgrade the antenna using external access point / CPE antenna to extend the wifi range and speed of your wifi vending machine.