Budget solid Raspberry Pi laptop with 7 inch screen by bingliang

Last crawled date: 3 years ago

Update V2 2018/11/10
CoverD and coverC changed , rounded curves, pi mounts removed (for easier installation), added a 8mm switch port, no usb hub, more internal free space, no need to replace pi's usb ports, add extra strengh to screen hinge on coverD.
Features
Visible IOs: RJ-45, hdmi, 3.5mm, usb 2.0 * 6
Display remaining battery power (if the powerbank circuit support that)
Charge while running (if the powerbank circuit support that)
Remove and install sd card on the Raspberry Pi is super easy
Minimum screws.
Tips
The powerbank circuit looks powerful, but the lcd draws a lot of currency, so the Pi always show the "lack of power" mark on the screen.
The usb ports on Pi are replaced with two AF90 usb female ports. The two free ones are connected to the keyboard dongle and the usb hub circuit.
I print the coverD with transparent PLA, looks great.
The powerbank circuit uses a lockless button (click to power on, push down for 4 secs to power off), but I bought a slide switch, so, I have to manually simulate the lockless behavior on a slide switch.
The 18650 cells physically support the keyboard. But it is a little crowded. If you use 14500 cells instead, you'd better print several holders to support the keyboard.
Future plans
I am satisfied with what I made, but there is still some improvments I can make.
A thicker coverD, no need to remove the usb ports on the Pi, 18650 cells don't touch the keyboard, no internal usb hub, larger free space (for larger battery capacity & currency or some kind of air cooling method).
Many defective details.
BOM List
Item
Count
Unit Price (CNY)
Core
Raspberry Pi 3
1
￥193.0
PcCooler heatsink
1
￥19.9 (8 pieces)
AF90 USB female
2
￥0.1
Acasis USB 2.0 hub (4 ports)
1
￥10.9
Vontar Wireless Keyboard with touchpad
1
￥28.0
Sandisk TF card 16G
1
￥38.5
Display
50P 7 inches 1024*600 lcd screen
1
￥63.7
50P hdmi lcd controller board (a smaller circuit with no VGA output)
1
￥40.0
HDMI wire
1
￥21.5
Power Supply
Micro USB female
1
￥0.1
SS12F15 slide switch
1
￥0.05
18650 cells
4
￥0.0 (from my dead laptop)
SM 2P Male Female Adapter
2 (pairs)
￥0.48
PVC heat shrink wrap tube for 18650, 85mm width
20cm
￥1.0
PVC heat shrink wrap tube for 18650, 30mm width
50cm
￥1.0
Power bank circuit 5V 2.1A
1
￥5.8
Assembly
M3 lock nut
2
M3 x25mm screw
2
M3 x5mm screw
9
M3 6+6mm copper pillar
4
M3 x18mm screw
7
M3 6+6mm copper pillar
4
M3 6+6mm copper pillar
4
M2 x10 screw
2
M2 nut
2
Sum


￥424.61 (about $65.9)
References
The keyboard frame is modified from the "Raspberry pi laptop by surferboy", other parts are designed originally.
"Raspberry Pi 3 Reference Design Model B Rpi Raspberrypi by alexandre_willame" helped me of designing the coverD, included in the blender file.