Created
July 4, 2022 15:38
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An asynchronous webserver written in MicroPython to turn an LED on/off on a Raspberry Pi Pico W
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| import network | |
| import socket | |
| import time | |
| from machine import Pin | |
| import uasyncio as asyncio | |
| led = Pin(15, Pin.OUT) | |
| onboard = Pin("LED", Pin.OUT, value=0) | |
| ssid = 'A Network' | |
| password = 'A 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 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(): | |
| 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: | |
| onboard.on() | |
| print("heartbeat") | |
| await asyncio.sleep(0.25) | |
| onboard.off() | |
| await asyncio.sleep(5) | |
| try: | |
| asyncio.run(main()) | |
| finally: | |
| asyncio.new_event_loop() |
This example works great. Wondering if there is an easy way to add url routing to this?
See https://www.raspberrypi.com/news/how-to-run-a-webserver-on-raspberry-pi-pico-w/
@aallan @boatrigm - I was just working on this, I've got a working solution with microdot api and reading sensor data concurrently. I'll upload my working project tonight but the jist is the below arrangement. The rest of my code above this in my project is just the microdot restAPI endpoints that I have working perfectly now with templating and inline python etc.
`async def server():
await app.run(port=80, debug=True)
async def main():
task = asyncio.create_task(server())
await weather()
if name == 'main':
asyncio.run(main())`
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This example works great. Wondering if there is an easy way to add url routing to this?