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GPS Speedometer & Rear View Camera
#1
Video 
Hi All,

I've been writing two python apps that have now become one.  I started off with the GPS Speedometer which works quite well. Then I wanted an app to control the rear view camera, like the Everlander YouTube solution, but I didn't want hardware buttons.

The problem I'm having is that a want them to stay in the foreground.  When booting they come up just fine with my app up-front. I can switch the camera on and off no problem at all.  It's when I use OpenAuto that I can't bring my apps to the foreground very easily.

Does anyone have a solution?

Here's a really rubbish, but it gets the point across, video I just uploaded to YouTube: 
 

My code can be found on GitHub, here: python gps speedometer and camera control Smile
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#2
Photo 
Hi All,

I've updated the script to include rear-view camera Start, Stop & Record buttons.  Must look into learning PyQT to make the graphics better...

[Image: python-rear-view-camera.jpg]
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#3
Thank you for sharing. Looks promising.
We are sure that many OpenAuto Pro users can benefit form you solution. Keep doing good job.
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#4
(09-10-2019, 10:37 AM)Carver Wrote: Hi All,

I've updated the script to include rear-view camera Start, Stop & Record buttons.  Must look into learning PyQT to make the graphics better...

[Image: python-rear-view-camera.jpg]
Great Work!
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#5
Tried to get speedo to work but have no luck. I would really appreciate the help, because my cars speedometer sensor died, and it will take me a month to get new one.
I allready have GLOBAL SAT BU-353-S4 USB GPS connected to the raspberry pi that with a script synchronize gps time to the raspberry pi.

I have Raspberry pi 4 connected to the official 7inch touchscreen, latest OAP6.0 software,...
Raspberry Pi 4b-4gb / Official 7" touchscreen / OAP 5.0 / Honor 8x (AndroidAuto 5.) / USB sound card / USB microphone
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#6
(02-09-2020, 08:01 AM)skrimo Wrote: Tried to get speedo to work but have no luck. I would really appreciate the help, because my cars speedometer sensor died, and it will take me a month to get new one.
I allready have GLOBAL SAT BU-353-S4 USB GPS connected to the raspberry pi that with a script synchronize gps time to the raspberry pi.

I have Raspberry pi 4 connected to the official 7inch touchscreen, latest OAP6.0 software,...

You changed the following, right? I know your GPS has a different device name based on playing around with your other time sync script.
Code:
gps = serial.Serial("/dev/ttyACM1", baudrate = 9600)
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#7
OK will try it again
Raspberry Pi 4b-4gb / Official 7" touchscreen / OAP 5.0 / Honor 8x (AndroidAuto 5.) / USB sound card / USB microphone
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#8
Note: If you don't have a Pi Camera hooked up and working, you will also have to comment out some lines from speedo.py

Add your user to the staff group
Code:
pi@raspberrypi:~ $ sudo adduser pi staff
Adding user `pi' to group `staff' ...
Adding user pi to group staff
Done.

Reboot -- or -- logout and login again

Code:
pi@raspberrypi:~ $ id pi
uid=1000(pi) gid=1000(pi) groups=1000(pi),4(adm),20(dialout),24(cdrom),27(sudo),29(audio),44(video),46(plugdev),50(staff),60(games),100(users),105(input),109(netdev),999(spi),998(i2c),997(gpio)
pi@raspberrypi:~ $ mkdir ~/software
pi@raspberrypi:~ $ cd ~/software
pi@raspberrypi:~/software $ git clone https://github.com/CarverFan/carver.git
Cloning into 'carver'...
remote: Enumerating objects: 14, done.
remote: Counting objects: 100% (14/14), done.
remote: Compressing objects: 100% (14/14), done.
remote: Total 14 (delta 3), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (14/14), done.
pi@raspberrypi:~/software $ cd carver

Convert the files to have proper Unix line endings (the developer likely created these files on Windows).
Code:
pi@raspberrypi:~/software/carver $ dos2unix speedo.py
pi@raspberrypi:~/software/carver $ dos2unix gaugelib.py
pi@raspberrypi:~/software/carver $ dos2unix rvcamlib.py

Edit speedo.py to verify/set the correct GPS device (in my case /dev/ttyACM0).
Code:
pi@raspberrypi:~/software/carver $ nano speedo.py
pi@raspberrypi:~/software/carver $ cat speedo.py
#!/usr/bin/python3

from tkinter import *
#import tkinter as tk
#from tkinter.font import Font
#from tkinter import messagebox
from time import time, sleep
import random
import gaugelib
import serial
from picamera import PiCamera
import rvcamlib

gps = serial.Serial("/dev/ttyACM0", baudrate = 9600)

win = Tk()
#a5 = PhotoImage(file="g1.png")
#win.tk.call('wm', 'iconphoto', win._w, a5)
win.title("Speed")
win.geometry("200x320+0+0")
win.resizable(width=False, height=False)
win.configure(bg='black')
runWindow = rvcamlib.rearViewCam(win)

g_value=0
x=0
course="0"

def read_every_second():
    global x
    global g_value_mph
    global course
    #g_value=random.randint(0,70)
    line = gps.readline().decode("utf-8")
    data = line.split(",")

    if data[0] == "$GNVTG":
        # km/h
        g_value = float(data[7])
        # mph
        g_value_mph = (g_value / 1.609)

       
        courseEmptyTest = data[1]
        print("cempty: %s" % (courseEmptyTest))

        if courseEmptyTest == '':
          course = 0
        else:
          course = float(data[1])

        if course == 0:
          courseText = 'North'
        elif 1 <= course <= 44:
          courseText = 'NNE'
        elif course == 45:
          courseText = 'NE'
        elif 46 <= course <= 89:
          courseText = 'ENE'
        elif course == 90:
          courseText = 'East'
        elif 91 <= course <= 134:
          courseText = 'ESE'
        elif course == 135:
          courseText = 'SE'
        elif 136 <= course <= 179:
          courseText = 'SSE'
        elif course == 180:
          courseText = 'South'
        elif 181 <= course <= 224:
          courseText = 'SSW'
        elif course == 225:
          courseText = 'SW'
        elif 226 <= course <= 269:
          courseText = 'WSW'
        elif course == 270:
          courseText = 'West'
        elif 271 <= course <= 314:
          courseText = 'WNW'
        elif course == 315:
          courseText = 'NW'
        elif 316 <= course <= 359:
          courseText = 'NNW'
        else:
          courseText = '???'

        p1.set_value(int(g_value_mph), str(courseText))

        print("mph: %.2f, course: %s" % (g_value_mph, courseText))
        print("VTG: %s" % (data))

    if data[0] == "$GNRMC":
      #print("RMC: %s" % (data))
      if data[2] == "A":

          dateTime = str(data[9]) + str(data[1])
          latgps = float(data[3])
          if data[4] == "S":
              latgps = -latgps

          latdeg = int(latgps/100)
          latmin = latgps - latdeg*100
          lat = latdeg+(latmin/60)

          longps = float(data[5])
          if data[6] == "W":
              longps = -longps

          londeg = int(longps/100)
          lonmin = longps - londeg*100
          lon = londeg+(lonmin/60)

          direction = data[8]
     
          with open("/media/usb/gps/gps-data-" + str(data[9]) + ".log", "a+") as pos:
              pos.write("Lat: %s, Lon: %s, dt: %s\n" % (lat, lon, dateTime))
              if 'g_value_mph' in globals():
                  pos.write("mph: %.2f, Direction: %s\n" % (g_value_mph, direction))


    x+=1
    if x>100:
        #graph1.draw_axes()
        x=0
    win.after(100, read_every_second)

p1 = gaugelib.DrawGauge2(
    win,
    max_value=100.0,
    min_value=0.0,
    size=200,
    bg_col='black',
    unit = "SPEED", unit1="HEADING", bg_sel = 2)

p1.grid(row=0, columnspan=3)

read_every_second()
mainloop()

Edit rvcamlib.py to change vidpath variable if necessary
Code:
pi@raspberrypi:~/software/carver $ nano rvcamlib.py
pi@raspberrypi:~/software/carver $ cat rvcamlib.py
#!/usr/bin/python3
from time import time, sleep
from tkinter import *
from picamera import PiCamera
from datetime import datetime, date, timedelta

camera = PiCamera()

vidpath = '/home/pi/Videos/'

class rearViewCam:

    def __init__(self, master):
        self.master = master
        self.button_clicks = 0

        self.labelText = StringVar()
        self.labelText.set("Cam Status Off")
        self.camStatus = Label(master, textvariable=self.labelText)
        self.camStatus.grid(row=2,columnspan=3)

        self.startButton = Button(master, text="Start", command=self.startCam)
        self.startButton.grid(row=1,column=0)

        self.stopButton = Button(master, text="Stop", state=DISABLED, command=self.stopCam)
        self.stopButton.grid(row=1,column=1)

        self.recButton = Button(master, text="Record", fg="green", command=self.recCam)
        self.recButton.grid(row=1,column=2)

    def startCam(self):
        self.labelText.set("Running")
        self.stopButton.config(state=NORMAL)
       
        camera.resolution = (1024, 768)
        camera.start_preview(fullscreen = False,
                            window = (185,25,510,350))

    def stopCam(self):
        if self.startCam is not None:
            self.startf = None
            camera.stop_preview()
            self.labelText.set("Stopped")

    def recCam(self):
        self.button_clicks += 0
        self.labelText.set("Recording ")
        self.recButton['text'] = "Start"
        if self.button_clicks == 0:
            self.button_clicks += 1
            self.recButton['text'] = "Started"
            self.recButton['fg'] = "red"
            # start recording
            now = datetime.now()
            dtStr = now.strftime("%d%m%Y-%H%M%S")
            vidfile = vidpath + "vid-" + dtStr + ".h264"
            camera.resolution = (1024, 768)
            camera.start_recording(vidfile)
        else:
            self.labelText.set("Stopped Recording")
            self.recButton['text'] = "Record"
            self.recButton['fg'] = "green"
            # stop recording
            camera.stop_recording()
            self.button_clicks = 0
     
   

Install the files
Code:
pi@raspberrypi:~/software/carver $ sudo install -o root -g staff -m 0770 -T speedo.py /usr/local/bin/speedo.py
pi@raspberrypi:~/software/carver $ sudo install -o root -g staff -m 0770 -T rvcamlib.py /usr/local/bin/rvcamlib.py
pi@raspberrypi:~/software/carver $ sudo install -o root -g staff -m 0770 -T gaugelib.py /usr/local/bin/gaugelib.py
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#9
Somehow managed to fix speedometer in my car.. And also this looks way too complicated for me to get it to work.
Raspberry Pi 4b-4gb / Official 7" touchscreen / OAP 5.0 / Honor 8x (AndroidAuto 5.) / USB sound card / USB microphone
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