Async web server and button press #12388

ropellanda · 2023-09-06T19:39:15Z

ropellanda
Sep 6, 2023

Hi, all.
Been having trouble setting up a web server that communicates with a button. This is one of my first Pico projects, so I'm sure it's a dumb mistake, but would appreciate any help.
The code is returning a syntax error at line 98:

import network
import socket
import time

from machine import Pin
import uasyncio as asyncio

ssid = 'ssid'
password = 'password'

html = """<!DOCTYPE html>
<html>
    <head> <title>Pico W</title> </head>
    <body> <h1>Pico W</h1>
        <p>%s</p>
    </body>
</html>
"""

wlan = network.WLAN(network.STA_IF)

def button_pressed_handler(pin):
    global button_presses, last_time
    new_time = utime.ticks_ms()

    if (new_time - last_time) > 200: 
        button_presses +=1
        last_time = new_time

button_pin.irq(trigger=machine.Pin.IRQ_FALLING, handler = button_pressed_handler)

def connect_to_network():
    wlan.active(True)
    wlan.config(pm = 0xa11140)  # Disable power-save mode
    wlan.connect(ssid, password)

    max_wait = 10
    while max_wait > 0:
        if wlan.status() < 0 or wlan.status() >= 3:
            break
        max_wait -= 1
        print('waiting for connection...')
        time.sleep(1)

    if wlan.status() != 3:
        raise RuntimeError('network connection failed')
    else:
        print('connected')
        status = wlan.ifconfig()
        print('ip = ' + status[0])

async def serve_client(reader, writer):
    print("Client connected")
    request_line = await reader.readline()
    print("Request:", request_line)
    # We are not interested in HTTP request headers, skip them
    while await reader.readline() != b"\r\n":
        pass

    request = str(request_line)
    led_on = request.find('/light/on')
    led_off = request.find('/light/off')
    print( 'led on = ' + str(led_on))
    print( 'led off = ' + str(led_off))

    stateis = ""
    if led_on == 6:
        print("led on")
        led.value(1)
        stateis = "LED is ON"
    
    if led_off == 6:
        print("led off")
        led.value(0)
        stateis = "LED is OFF"
        
    response = html % stateis
    writer.write('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
    writer.write(response)

    await writer.drain()
    await writer.wait_closed()
    print("Client disconnected")

async def main():
    global button_presses, last_time, old_presses
    print('Connecting to Network...')
    connect_to_network()
    print('Setting up webserver...')
    asyncio.create_task(asyncio.start_server(serve_client, "0.0.0.0", 80))
    while True:
        if button_presses != old_presses:
        print(button_presses)
        old_presses = button_presses
        
try:
    asyncio.run(main())
finally:
    asyncio.new_event_loop()

Answered by shariltumin

Sep 6, 2023

You probably forgot to indent lines 93 and 94 after if button_presses != old_presses:

View full answer

GitHubsSilverBullet · 2023-09-06T19:47:04Z

GitHubsSilverBullet
Sep 6, 2023

Might be a good idea o correct indentation a bit above line 98.

1 reply

ropellanda Sep 6, 2023
Author

Thank you, that solved it

shariltumin · 2023-09-06T20:13:17Z

shariltumin
Sep 6, 2023

You probably forgot to indent lines 93 and 94 after if button_presses != old_presses:

1 reply

ropellanda Sep 6, 2023
Author

Thanks, that was it!

rkompass · 2023-09-06T20:48:38Z

rkompass
Sep 6, 2023

If my understanding is correct then the idented

    while True:
        if button_presses != old_presses:
            print(button_presses)
            old_presses = button_presses

blocks, i.e. prevents the async machinery from working.
Also the global variables and the pin are not set up.

1 reply

ropellanda Sep 6, 2023
Author

Thanks, i had removed the variables to test, it was the indentations

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