The wifi-car-with-raspberry-pi4 from abishevs

wifi-car-with-raspberry-pi4's Introduction

If venv (virutal envierement) is not installed.

sudo apt install python3.10-venv

if just cloned make an virtual envierament

python3 -m venv ./flask-env

start virtual envierement.

source flask-env/bin/activate

then install dependencies

pip install -r requirements.txt

To deactivate type

deactivate

Start the server with debug mode set to True

python3 flask-ard-car.py

To update requirements.txt type this

pip freeze > requirements.txt

Conection frontend to backend

Using ajax and javascript to send data on every button click or keystroke press.
Keystrokes(wasd and arrows, space or escape for stop) P.S speed up and down not implemnted yet

Future fix of delay from frontend

Use socket.io and get bi-direcation connection to the server. This way sending data will be very low latency.

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wifi-car-with-raspberry-pi4's Issues

video lags

i see video on page but it is bit too laggy.
so i tried to rewrite two parts of camera.py:

from picamera.array import PiRGBArray
from picamera import PiCamera
class VideoCamera(object):
    def __init__(self, flip = False, file_type = ".jpg", photo_string = "photo-taken"):
        #self.vs = PiVideoStream(resolution=(640, 480), framerate=30)
        self.vs = PiCamera(resolution=(640, 480), framerate=30)
        self.rawCapture = PiRGBArray(self.vs)
        
        #self.vs.start()
        #self.vs = PiVideoStream().start()

and

def get_frame(self):
        #frame = self.flip_if_needed(self.vs.read())
        for frame in self.vs.capture_continuous(self.rawCapture, format="bgr"):
            #ret, jpeg = cv.imencode(self.file_type, frame)
            self.rawCapture.truncate(0) 
            self.image = frame.array
            ret, jpeg = cv.imencode(self.file_type, self.image)            
            #self.previous_frame = jpeg
            return jpeg.tobytes()

dont know if it start working a bit faster...
may be a better solution is io.BytesIO()
https://stackoverflow.com/questions/40065328/picameravalueerror-incorrect-buffer-length-for-resolution-1920x1080

async key strokes from website

hi!
thanks for code. i use it in raspberry pi zero 2.

as far as i understand the main logic of control is here:

def retrieve_data():
    id = request.args.get('id', 0)
    id = int(id)
    print(f"Recieved from the web id: {id}")
    if 1 <= id <= 5:
        write_to_arduino(id)

i have changed for my case this way (as i have no arduino and made direct connection to motor driver):

def retrieve_data():
    id = request.args.get('id', 0)
    id = int(id)
    print(f"Recieved from the web id: {id}")
    if 1 <= id <= 5:
        #write_to_arduino(id)
        if id==4:
            setServoAngle(servo, 140)
        if id==5:
            setServoAngle(servo, 90)
        if id==1:
            mov.Forward(speed)
        if id==2:
            mov.Backward(speed)
        if id==3:
            mov.Stop()

but as i see there is synchronous code and when one key pressed there is no way to press another at the same time.
are you planning to add something async?

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