pi4 0.0.7

Raspberry Pi Applications.

pi - Raspberry (Raspberry Pi 4B) related codes

TODO: AI deploy | Upload goserver? | Autostart | setup.cfg | acc speed / continuous/step mode setting | after acc test, vehicle nav changes

OS : raspbian 64-bit.

Development on pi is quite comfortable. It is essentially linux-based app development, with some GPIO/I2C/SENSOR programmings.

Vehicle

The GUI uses ttkbootstrap, tkinter, pyqt, opencv etc.

vehicle acc (adaptive cruise control)

* The vehicle has a supersonic sensor, short-distance collision detection sensors, fall detection sensor and a pan-tilt-mounted infra-red camera.  
* The vehicle currently USED PINS:

3V3  (1) (2)  5V    
- GPIO2 PCA9685 SDA (3) (4)  5V    
- GPIO3 PCA9685 SCL (5) (6)  GND   
- GPIO4 IR Control (7) (8)  - GPIO14 UART TX
GND  (9) (10) - GPIO15 UART RX
* GPIO17 (11) (12) - GPIO18
- GPIO27 (13) (14) GND   
- GPIO22 (15) (16) - GPIO23
3V3 (17) (18) - GPIO24
* GPIO10 SPI (19) (20) GND   
* GPIO9 SPI (21) (22) - GPIO25
* GPIO11 SPI (23) (24) * GPIO8 SPI0 CE0
GND (25) (26) * GPIO7 SPI0 CE1
- GPIO0 (27) EEPROM SDA (28) - GPIO1 EEPROM SCL | CAT24C32: EEPROM 串行 32-Kb I2C
- GPIO5 (29) (30) GND   
- GPIO6 (31) (32) - GPIO12
- GPIO13 (33) (34) GND   
- GPIO19 (35) (36) - GPIO16
- GPIO26 (37) (38) - GPIO20
GND (39) (40) - GPIO21

Medical Device

* This is a 4b-based medical device prototype. The GUI provides camera liveview, image capturing, browsing, uploading (future).

IOT

Raspberry pi-based iot experiments code.

Some sensors can be replaced by other types. e.g., touch sensor -> tilt / vibration / reed / push button.

With the i2c chip (8591), you can use analog output sensors, such as joystick, raindrop, smog, flame, thermo-resistor, photo-resistor, noise, etc.

Setup the raspberry pi os

0. Use the official Raspi Imager tool to setup Raspbian 64 bit OS to SD card

1. If you haven't configured wifi in Raspi Imager, create the wpa_supplicant.conf file in boot folder:

country=CN update_config=1 ctrl_interface=/var/run/wpa_supplicant

network={ scan_ssid=1 ssid="2701" # wifi name psk="xxx" # password priority=1 }

2. create an empty file named ssh in boot folder.

3. Boot device

4. Use the wireless router's admin panel to check the pi's ip:

SSID1 raspberrypi 192.168.5.xxx e4:5f:01:9c:1b:c4

5. ssh [e-mail]

   The authenticity of host '192.168.5.120 (192.168.5.120)' can't be established. ECDSA key fingerprint is SHA256:Qj+rFMb4dTkKNh6SeADd30S9KK8N1mSyTvKFqSEq8M4. Are you sure you want to continue connecting (yes/no/[fingerprint])? y Please type 'yes', 'no' or the fingerprint: yes Warning: Permanently added '192.168.5.120' (ECDSA) to the list of known hosts. pi@192.168.5.120's password: Linux raspberrypi 5.15.32-v7l+ #1538 SMP Thu Mar 31 19:39:41 BST 2022 armv7l

   pinout

   pi@raspberrypi:~ $ pinout ,--------------------------------. | oooooooooooooooooooo J8 +====== | 1ooooooooooooooooooo PoE | Net | Wi 1o +====== | Fi Pi Model 4B V1.5 oo | | ,----. +---+ +==== | |D| |SoC | |RAM| |USB3 | |S| | | | | +==== | |I| ----' +---+ | | |C| +==== | |S| |USB2 | pwr |hd| |hd| |I||A| +==== -| |---|m0|---|m1|----|V|-------'

6. pi@raspberrypi:~ $ raspi-config

   Enable VNC in the interface settings Change VNC resolution to 1280x720 in the display settings. (to enhance response speed) Expand SD storage. then df-h to check

7. Connect SPI screen and reboot

   If wifi is disabled, the SPI screen will show; otherwise use ssh, VNC or Teamviewer.

   sudo nano /boot/config.txt

   Uncomment the dtoverlay=vc4-kms-v3d

   sudo reboot

8. Connect SPI camera

   libcamera-hello [OBSOLETE] > sudo raspistill -o myimg.jpg

9. Plugin the camera and test

   sudo apt-get update && sudo apt-get upgrade sudo apt-get install fcitx fcitx-googlepinyin # optional: install IME

   sudo apt-get install luvcview luvcview # a live view of /dev/video0

   sudo apt install fswebcam fswebcam -r 1280x720 --no-banner image1.jpg # capture image

10. Install numpy and opencv

    [Optional] When the network speed is unbearable )NOTE: The file content for 32 and 64 bit OS differ):

    sudo nano /etc/apt/sources.list
    sudo nano /etc/apt/sources.list.d/raspi.list
    Replace deb and deb-src with domestic mirrors. e.g., http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ bullseye ...

    sudo pip install --upgrade cmake numpy opencv-python opencv-contrib-python -i https://pypi.tuna.tsinghua.edu.cn/simple

11. WringPi

    64bit: wget https://github.com/WiringPi/WiringPi/releases/download/2.61-1/wiringpi-2.61-1-arm64.deb

    or

    32bit: wget https://github.com/WiringPi/WiringPi/releases/download/2.61-1/wiringpi-2.61-1-armhf.deb

    sudo dpkg -i wiringpi-latest.deb gpio -v gpio readall

12. Setup GPIOZero and/or RPi.GPIO

    sudo apt install python3-gpiozero
    gpiozero can be simpler than RPi.GPIO and more friendly to beginners.
    The gpiozero module always uses Broadcom GPIO numbering to identify a GPIO.
    The RPi.GPIO module can use physical pin numbering (BOARD) or Broadcom GPIO numbering (BCM). The physical pin 21 is connected to GPIO 9.

13. I2C device setup

    gpio i2cdetect

        0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
    00:                         -- -- -- -- -- -- -- -- 
    10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- -- 
    30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    40: 40 -- -- -- -- -- -- -- 48 -- -- -- -- -- -- -- 
    50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- -- 
    60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    70: 70 -- -- -- -- -- -- --   

0x27 - LCD1602 PCF8574
0x40 - servo: PCA9685 16-channel PWM driver
0x48 - ADC: PCF8591
0x57 - SpO2 sensor
0x70 - 

To check a full list of I2C addresses, go to https://i2cdevices.org/addresses

14. [Optional] Setup ir (infra-red). This is the most painful part. Take patience.

    sudo apt install lirc liblircclient-dev ir-keytable # lirc: Linux Infrared Remote Control

    sudo nano /boot/config.txt dtoverlay=gpio-ir,gpio_pin=17 #4 dtoverlay=gpio-ir-tx,gpio_pin=18 #5

    sudo reboot

    pi@raspberrypi:~ $ sudo ir-keytable -c -p all -t Old keytable cleared Protocols changed to unknown other lirc rc-5 rc-5-sz jvc sony nec sanyo mce_kbd rc-6 sharp xmp cec imon rc-mm Loaded BPF protocol xbox-dvd Testing events. Please, press CTRL-C to abort.

    [press some key on the remote controller]

    237.470055: lirc protocol(nec): scancode = 0x45 237.470076: event type EV_MSC(0x04): scancode = 0x45 237.470076: event type EV_SYN(0x00). 237.530059: lirc protocol(nec): scancode = 0x45 repeat 237.530079: event type EV_MSC(0x04): scancode = 0x45 237.530079: event type EV_SYN(0x00). 238.790052: lirc protocol(nec): scancode = 0x46 238.790071: event type EV_MSC(0x04): scancode = 0x46 238.790071: event type EV_SYN(0x00).

    sudo nano /etc/lirc/lirc_options.conf

    driver = default device = /dev/lirc1

    pi@raspberrypi:~ $ sudo systemctl stop lircd.service Warning: Stopping lircd.service, but it can still be activated by: lircd.socket pi@raspberrypi:~ $ sudo mode2 -d /dev/lirc1 [Press some keys on the remote controller] Using driver default on device /dev/lirc1 Trying device: /dev/lirc1 Using device: /dev/lirc1 Running as regular user pi pulse 9071 space 4471 pulse 608 space 519 pulse 589 ...

    在程序案例的23讲红外遥控实验把lircd.conf 传到pi目录下； sudo cp lircd.conf /etc/lirc/lircd.conf

    sudo reboot

    pi@raspberrypi:~ $ irw 0000000000000001 00 KEY_CHANNELDOWN ./lircd.conf 0000000000000002 00 KEY_CHANNEL ./lircd.conf 0000000000000008 00 KEY_VOLUMEDOWN ./lircd.conf 0000000000000007 00 KEY_VOLUMEUP ./lircd.conf

15. Enable 1 Wire

enable "1 wire" and add "dtoverlay=w1-gpio" to /boot/config.txt

reboot

Connect the 1-wire temperature sensor

pi@raspberrypi:/sys/bus/w1/devices/28-012029342a03 $ cat w1_slave
c2 01 4b 46 7f ff 0c 10 a8 : crc=a8 YES
c2 01 4b 46 7f ff 0c 10 a8 t=28125
pi@raspberrypi:/sys/bus/w1/devices/28-012029342a03 $ cat w1_slave
c2 01 4b 46 7f ff 0c 10 a8 : crc=a8 YES
c2 01 4b 46 7f ff 0c 10 a8 t=28125

16. ap

    git clone https://github.com/oblique/create_ap.git
    cd create_ap
    sudo make install
    sudo apt-get install dnsmasq
    sudo apt-get install util-linux procps hostapd iproute2 iw haveged

    sudo create_ap wlan0 eth0 热点名 密码

    optional:
    sudo nano /etc/rc.local
    add create_ap ...

17. ttkbootstrap and webview

    [gtk backend for webview] > sudo apt install python3-gi python3-gi-cairo gir1.2-gtk-3.0 gir1.2-webkit2-4.0
    [optional if use qt backend for webview] > sudo apt install python3-pyqt5 python3-pyqt5.qtwebengine python3-pyqt5.qtwebchannel libqt5webkit5-dev

    sudo pip install ttkbootstrap pywebview -i https://pypi.tuna.tsinghua.edu.cn/simple

Install

pip install pi4

Run

IoT GUI: `python -m pi.iot.main_gui`

Camera GUI: `python -m pi.gui.camera.ttk`