7" Touchscreen with Keyboard Rugged Raspberry Pi Tablet

thingiverse

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, making it compatible with Raspberry Pi 3+ and Pi4 models. The frame is mostly 5mm thick walls for strength and durability, printed in PLA which is plenty strong and slightly flexible. ABS would be the most hardcore option for this build. #BOM: - Your favorite Raspberry Pi form factor computer - 2S charger with 9-15v input - 2S balance and protection board - DC to DC Buck Converter with 5amp output - 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 at 1024x600px - Waterproof USB 2.0 or 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, wire them each with a length of 20ga silicone wire then 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 goes to the switch, while 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 where the positive and negative from the charger board attach so it can charge with the switch off. Use 24GA wire from the charger to the cells and 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 halves and around the screen. I made keyboard clips that glue in with superglue to hold the keyboard in place. It's currently a work in progress as I have not yet assembled mine.