#Zepir Raspberry Pi Zero mini computer

Details

First preview :)

There nothing, just display and buttons ;)

Display configuration

sudo apt-get install cmake
cd ~
git clone https://github.com/juj/fbcp-ili9341.git
cd fbcp-ili9341

mkdir build
cd build

cd fbcp-ili9341/build
rm -r *

cmake -DST7789VW=ON -DGPIO_TFT_DATA_CONTROL=25 -DGPIO_TFT_RESET_PIN=27 -DGPIO_TFT_BACKLIGHT=24 -DSTATISTICS=0 -DSPI_BUS_CLOCK_DIVISOR=6 -DUSE_DMA_TRANSFERS=OFF -DDISPLAY_ROTATE_180_DEGREES=ON ..

make -j
sudo ./fbcp-ili9341

For autorun on startup put this line before exit 0 in your sudo nano /etc/rc.local

sudo /home/pi/fbcp-ili9341/build/fbcp-ili9341 &
sudo modprobe -i uinput &
sudo python /home/pi/keyboard/keyboard.py &
sudo setfont /usr/share/consolefonts/Lat2-Terminus20x10.psf.gz &

These lines are in my sudo nano /boot/config.txt file:

hdmi_group=2
hdmi_mode=87
hdmi_cvt=320 240 60 1 0 0 0
hdmi_force_hotplug=1

Change in driver before compilation st7735r.h

#if defined(ST7789) || defined(ST7789VW)
#define DISPLAY_NATIVE_WIDTH 240
#define DISPLAY_NATIVE_HEIGHT 320
#elif defined(ST7735R)
#define DISPLAY_NATIVE_WIDTH 128
#define DISPLAY_NATIVE_HEIGHT 160
#elif defined(ST7735S)

Change in driver before compilation st7735r.cpp

#ifdef ST7789
    // The ST7789 controller is actually a unit with 320x240 graphics memory area, but only 240x240 portion
    // of it is displayed. Therefore if we wanted to swap row address mode above, writes to Y=0...239 range will actually land in
    // memory in row addresses Y = 319-(0...239) = 319...80 range. To view this range, we must scroll the view by +80 units in Y
    // direction so that contents of Y=80...319 is displayed instead of Y=0...239.
    if ((madctl & MADCTL_ROW_ADDRESS_ORDER_SWAP))
    //  SPI_TRANSFER(0x37/*VSCSAD: Vertical Scroll Start Address of RAM*/, 0, 320 - DISPLAY_WIDTH);
        SPI_TRANSFER(0X37,0,0);
#endif

Keyboard reading is based on:

https://mrpjevans.com/zx-raspberry-version-2/

https://github.com/mrpjevans/zxscanner2/

Files

keyboard.py

x-python - 6.25 kB - 06/27/2021 at 21:43

Download

z3.sch

sch - 512.11 kB - 06/23/2021 at 21:03

Download

z3.brd

brd - 149.24 kB - 06/23/2021 at 21:03

Download

schema2.png

Portable Network Graphics (PNG) - 39.99 kB - 06/23/2021 at 21:02

Preview

Project Logs

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Installation v2 - My private notes ;)

bobricius • 10/01/2021 at 21:04 • 0 comments

My private notes ;)

My steps:

Write image: 2021-05-07-raspios-buster-armhf-lite.img

copy to boot:

empty file ssh

wpa_supplicant.conf

country=SK
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="mynetwork"
    psk="mykey"
}

add in to config.txt

[all]

hdmi_group=2
hdmi_mode=87
hdmi_cvt=320 240 60 1 0 0 0
hdmi_force_hotplug=1

dtparam=audio=on
start_x=0

dtoverlay=audremap,pins_18_19
dtparam=i2s=on
dtparam=spi=off

display IP address

ifconfig

via ssh

$ sudo raspi-config

SET AUDIO > headphones
boot console autologin pi

DISPLAY SETUP

sudo apt-get update
sudo apt-get install cmake
sudo apt-get install git
cd ~
git clone https://github.com/bobricius/fbcp-ili9341.git
cd fbcp-ili9341

cd fbcp-ili9341/build
rm -r *

cmake -DST7789VW=ON -DGPIO_TFT_DATA_CONTROL=25 -DGPIO_TFT_RESET_PIN=27 -DSTATISTICS=0 -DSPI_BUS_CLOCK_DIVISOR=6 -DUSE_DMA_TRANSFERS=OFF -DDISPLAY_ROTATE_180_DEGREES=ON ..

make -j
sudo ./fbcp-ili9341

Extra toys

sudo apt-get install mc
sudo apt-get install w3m
sudo apt-get install mpg123

KEYBOARD SETUP

cd ~
git clone https://github.com/bobricius/gpiokeyboard.git
pip3 install python-uinput

For autorun on startup put this line before exit 0 in your sudo nano /etc/rc.local

sudo /home/pi/fbcp-ili9341/build/fbcp-ili9341 &
sudo modprobe -i uinput &
sudo python3 /home/pi/gpiokeyboard/gpiokeyboard.py &
sudo setfont /usr/share/consolefonts/Lat2-Terminus20x10.psf.gz &

View project log

Discussions

torincampbell1 wrote 07/24/2024 at 00:25

I want to see this but with a pico :)

Are you sure? yes | no

LAPINI wrote 01/31/2024 at 22:37

Does it support Hebrew?

Are you sure? yes | no

Trevor O'D wrote 02/28/2022 at 22:37

what are the dimentions of the device I am trying to make a case for mine so I can carry it around

Are you sure? yes | no

bobricius wrote 03/01/2022 at 11:42

Dimension:97.79 mm* 82.56 mm

Are you sure? yes | no

Trevor O'D wrote 02/18/2022 at 02:26

Is there a case out there for this or would I need to make my own

Are you sure? yes | no

bobricius wrote 02/18/2022 at 07:36

No case designed

Are you sure? yes | no

teraz wrote 11/03/2021 at 21:36

how long this device work on one charging? is possible add solar panel?

Are you sure? yes | no

John Hind wrote 05/29/2021 at 10:17

Love the keyboard concept - might have to steal it for my next-gen calculator project! But this would be a lot neater as an IO board for the Compute Module 4. The whole assembly could be much more compact (depending on how many and what type of connectors you chose to implement).

Are you sure? yes | no

bobricius wrote 06/07/2021 at 21:13

Zepir is specially designed to be max. simple, zero integrated circuits, TH soldering :)

Are you sure? yes | no

Sam Garfield wrote 04/16/2021 at 20:22

Will you be selling a complete version on tindie?

Are you sure? yes | no

xxx wrote 04/15/2021 at 17:07

Where i can download gerberbers for repeat this project?

Are you sure? yes | no

bobricius wrote 04/15/2021 at 21:17

I preparing share next version (bot is untested now), this have some bugs.

Are you sure? yes | no

xxx wrote 04/16/2021 at 08:00

Great! I will wait for relaese gerbers.

Are you sure? yes | no

marazm wrote 02/04/2021 at 11:54

Dodaj kilka diód. Chodzi o informacje czy wciśnieęto capslock, ins, czy przyszła poczta itp.

Myślę, że warto też zrobić miejsce by można było tam wstawić raspbery pi pico 2040 lub jakieś inne procesory. Jak by było to autonomiczne bez zasilania po kablu to wiele osób by chciało miec komputer na swoim *(tu wpisz procesor) ulubionym procesorze

Are you sure? yes | no

aldolo wrote 01/28/2021 at 06:39

keyboard is always the toughest part. cheap and brilliant solution.

Are you sure? yes | no

xxx wrote 01/27/2021 at 08:28

In general, it could be diluted through Atmega32u4, making both the mouse and the keyboard at once, and dissolve on the board itself USB-HUB FE1.1s for 4 ports

Are you sure? yes | no

xxx wrote 01/27/2021 at 08:25

looks very interesting, the only thing I would add at the place where the palm is shown is a trackball or joystick to control the mouse cursor

Are you sure? yes | no

Anthony DiGirolamo wrote 01/19/2021 at 06:31

Looks great!!! I like your key layout. If it helps free up GPIO pins you could use a TCA8418 which has linux kernel module support. Kicad and links here https://github.com/AnthonyDiGirolamo/i2c-thumb-keyboard

Your design is a perfect form factor for coding & gaming on the go with https://www.lexaloffle.com/pico-8.php

Are you sure? yes | no

bobricius wrote 01/19/2021 at 12:34

Thanks, Yes I know this, but look like I have exactly enough GPIO for full keyboard. I love simplicity :-) I just ordered 2 Boards batch (maybe next revision can fit over RPI 3/4), receive soon.

Are you sure? yes | no

ptrav wrote 01/10/2021 at 02:37

Interesting project.

On your keyboard wiring diagram, one problem is obvious.

Let say, you keep all "columns" high and set all "rows" as "input-pullup". Then, you scan the columns by setting one column "low" in a cycle and testing all inputs one-by-one. The pressed button will be on the crossing between the column pulled "low" and the row showing "low". As far as the user presses one button at the time, all good and sound.

What happens, however, if the user presses 2 buttons of the same row? Let say, column #1 is momentary "low" and column #5 is "high". Then, column #5 will feed 3.3V at unlimited current into the column #1. One of the digital outputs - most likely the column #5 - will fry. It is a good idea to put a diode at each column to prevent this.

The way of circumventing is not to use pins as digital inputs but use the internal resistors:

GPIO.setup(button, GPIO.IN, GPIO.PUD_UP)

All 6 columns are set to GPIO.PUD_UP and one of them set to GPIO.PUD_DOWN at any given time. The internal 50k resistor will limit the current and the outputs will not fry.

One more problem remains. If the user presses 3 buttons simultaneously, a "ghost" (unpressed) button will register. For example if the user holds buttons C1R3, C2R2, and C2R3 - button C1R2 is registered. That's why each key should have its own diode. However, on a tiny keyboard like yours people are unlikely to touch-type, so may be these diodes are excessive.

The good explanation of matrix keyboards is here:

http://blog.komar.be/how-to-make-a-keyboard-the-matrix/

Good luck with your project.

Are you sure? yes | no

#Zepir Raspberry Pi Zero mini computer

Description

Details

Files

keyboard.py

z3.sch

z3.brd

schema2.png

Project Logs

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Installation v2 - My private notes ;)

Discussions

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#Zepir Raspberry Pi Zero mini computer

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Just one more thing

Description

Details

Files

keyboard.py

z3.sch

z3.brd

schema2.png

Project Logs Collapse

Installation v2 - My private notes ;)

Enjoy this project?

Discussions

Become a Hackaday.io Member

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Raspberry Pi Smart Display

OpenHAB2 Raspberry Pi Touch Display

Raspberry PI 400 cyberdetox display

DAKboard

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