7" Touchscreen with Keyboard Rugged Raspberry Pi Tablet by morganlowe

Last crawled date: 4 years ago

This is a mod of my Rasptop 2.0 Laptop to create a pretty rugged mildly water resistant if built correctly tablet computer.
It uses a lot of the same parts as the Rasptop 2.0 including the 7.2 volt 2s battery system.
It features Raspberry Pi 3+ compatibility including the Pi4.
The frame is mostly 5mm thick walls for strength and durability. I printed mine in PLA which is plenty strong and slightly flexible which helps but of course ABS would be the most hard core for this.
BOM:

Your favorite Raspberry Pi form factor computer.


2S charger 9-15v input


2S Balance and Protection Board


DC to DC Buck Converter 5amps


2S Charger Indicator


9 volt 5amp Power Supply, using 9v instead of 12v greatly reduces heat in the charger circuit


Keyboard


DC Jack with cover


16MM Waterproof Button


7" Capacitive Touch Screen @ 1024x600px


Waterproof USB 2.0 There is the same in USB 3 for RPI4 use.


USB Power Bank for the batteries x 2


Sealing Tape for seams and around screen

Short USB Type A Cable
Wiring:

Starting with the batteries I wired them each with a length of 20ga silicone wire then on the balance board you connect positive from one cell and negative from the other to the B+ and B+ tabs on the balance board. The leftover positive and negative wire both go to the BM pad together making a series connection.
The P+ from the balance board then go to the switch. The P- goes right to the converter board input. At the power board input also wire in the battery meter. The P+ and P-are also where the positive and negative from the charger board attach so it can charge with the switch off. I used 24GA wire from the charger to the cells. I also used 24gs from the DC barrel jack to the charger board.
Be sure to set the voltage before connecting anything to the DC to DC converter!
No more than 5.2 volts. Set to 5.1 volts!
When assembling use sealing tape on the seams between the case halve and around the screen.
it is currently a work in progress as I have not yet assembled mine!
I made keyboard clips, these glue in with superglue to hold the keyboard in place.
Thank you!