In another DIY project of a raspberry engineer, they have attempted to make a Raspberry Pi Computer that only cost $35. This mini-sized PC hold various possibilities and can be used in the form of PVRs (personal video recorders), retro gaming machines, weather stations, in-car PCs, jukeboxes etc. The creativity completely lies in your hand and brain that how you want to use this product.
This ultra-portable, mobile Raspberry Pi that you can take to-go is an open source project. And here, the developer has explained every bit of this project. Talking about the LCD screen, in this budget-friendly project, the LCD is used from an aftermarket backup camera system that can be installed in a car. Hence, it has a low-resolution screen, is 3.5″ using a 4:3 aspect ratio and also it uses a composite input and can display a resolution of 640 x 480 pixels.
Mobile Raspberry Pi Computer (Image Courtesy: http://projects-raspberry.com)
Lithium-ion batteries are really dangerous and it is advisable to handle it with care. Here, the battery used was from Dell Latitude D600 laptop, which was about the right size and right voltage. The power can be obtained by connecting pins 1,2, & 4 together for negative / ground (-) and pins 8 & 9 together for positive (+). The battery is charged by using an after-market laptop battery charger.
The Raspberry Pi is powered by a micro USB 5v with at least 750ma, 1A is better but the USB port can only stream120ma per port. Therefore, a super small 7 port USB hub is used to power wireless Wi-Fi dongle, a Bluetooth dongle, an SSD hard drive, a keyboard/mouse transmitter, and the Raspberry Pi itself.
The Extended Storage is 64GB SSD along with 1GB (1,024 MB) Linux swap partition was set up and have the rest formatted in ext4 for extended storage. Then there are some Built-in features too like a nano-USB Wi-Fi dongle and a nano-USB Bluetooth dongle to install inside the mobile Pi.
For the Operating System, stock Raspbian Linux downloaded from raspberrypi.org is used with certain modifications in the config.txt file. While the Keyboard & Touchpad Mouse was purchased.