In this project i will be showing you how to Make a simple touchscreen tablet for under 80 that works and can be used to browse the internet, watch movies , etc.
The parts you will need for this project are :
Raspberry pi zero https://www.adafruit.com/product/3400.
Raspberry pi http://amzn.to/2yllCiG
The in detailed tutorial is below but you can check out the video version here:
To start off we should first load an operating system onto an SD card that has 4GB or more space. Once you have an sd card you will need to download an operating system to run on the SD card. I recommend raspbian which can be found here . Once the operating system is downloaded you will need to format and write the operating system to the SD card. The easiest way to do that is using Etcher, it will detect your operating system , detect your SD card and do the formatting and writing for you.
Now you can go ahead and test everything out. To test it out insert the micro SD card into the rasperry pi zero or B+ (whichever you use). Plug in the microUSB power port of the raspberry pi to a 5v power source (phone charger). To use the raspberry pi as a simple computer you now need to plug a screen in via HDMI and plug in a Keyboard or mouse.
To use the TFT screen as your display you will need to connect the screen screen to the raspberry pi via an hdmi cable. This will relay video. To power the screen and relay touchscreen info (if you decide to use a touchscreen) plug the screen into the raspberry pi using an microusb to usb cable. if your using a raspberry pi zero you will need a microusb to microusb cable.
if the resolution is not correct on the screen refer to this
Start off by making a frame for your tablet. I used cardboard but any other frame works as long as it holds the parts together
Next we need to make a system to power everything. For the powering system we will need to connect the battery to the boost converter to boost the voltage from 3.7 to 5 volts .connect the battery to the input of the boost converter and add a switch in between. The voltage of the boost converter can be modified by turning the little gold potentiate attached to the boost converter. Make sure the boost converter is outputting 5 volts, to check the voltage you may need some kind of voltmeter or multi-meter.
Next connect the output of the boost converter to a cable that feed into the raspberry pi. To charge the battery we will need a female usb port connected directly to the battery. A female usb port can be obtained by snipping a usb extension cable.
To power the touchscreen and relay the touch signal and microusb to microusb cable will be needed. You may be able to find a microusb to microusb cable online, if not you can also make one by cutting 2 separate microusb to usb cables in half and reattaching the microusb cables together
To finish the project off, connect the hdmi port on the touchscreen to the mini hmdi port of the raspberry pi. if you are using a normal hdmi cable yto will need an adapter. note in the picture i decided to use a special ribbon to make it look less bulky.
Now you can test the project out and enjoy your touchscreen tablet!