init - new files

just a start

boot.py

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+# This file is executed on every boot (including wake-boot from deepsleep)
+import uos, machine, time, network, gc, webrepl
+
+# start webinterface and do a garbage collection (bc of reasons)
+webrepl.start()
+gc.collect()
+
+# get wifi credentials
+from wifi_config import NETWORKS
+
+def connect_to_wifi(ssid, password, timeout = 15):
+    wlan = network.WLAN(network.STA_IF)
+    wlan.active(True)
+    print(f"connecting to network \"{ssid}\" ...")
+    wlan.connect(ssid, password)
+    start_time = time.time()
+    while not wlan.isconnected():
+        print("start: ", start_time)
+        print("time:", time.time())
+        print("condition: ", start_time - time.time() > timeout)
+        if time.time() - start_time > timeout:
+            print(f"failed to connect to {ssid} within {timeout} seconds")
+            return False
+        time.sleep(1)
+    print(f"connection to {ssid} established")
+    print("network config: ", wlan.ifconfig())
+    return True
+
+# try to connect to networks
+for wifi in NETWORKS.values():
+    ssid = wifi["ssid"]
+    password = wifi["password"]
+    if connect_to_wifi(ssid, password):
+        break
+
+# no connection established
+if not network.WLAN(network.STA_IF).isconnected():
+    print("failed to connect to any wifi network")

main.py

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+import os, machine, time, neopixel, micropython
+
+micropython.alloc_emergency_exception_buf(100)
+
+# how many LEDs are there in a row?
+Nled = 16
+
+# define pin for led control
+# see reference for GPIO numbers: https://microcontrollerslab.com/wp-content/uploads/2019/05/ESP8266-12E-Wemos-D1-Mini-pinout.jpg
+# not all GPIO pins can be used ...
+pin_number = 5
+neopin = machine.Pin(pin_number, machine.Pin.OUT)
+# initialize neopixel object to write to
+np = neopixel.NeoPixel(neopin, Nled)
+
+# define pin for button
+button = machine.Pin(13, machine.Pin.IN)
+
+# variable and function for button handling
+button_pressed = False
+def handle_button(pin):
+    global button_pressed
+    button_pressed = True
+    time.sleep_ms(200)
+
+# register button function for interrupt
+button.irq(trigger=machine.Pin.IRQ_RISING, handler=handle_button)
+
+# define ranges of LEDs
+full = range(0, Nled)
+
+# define colors for LEDs
+red = (255, 0, 0)
+green = (0, 255, 0)
+blue = (0, 0, 255)
+orange = (220, 35, 0)
+purple = (255, 0, 255)
+white = (255, 255, 255)
+off = (0, 0, 0)
+
+# color the leds
+def paint(color = white, section = full, single = False):
+    if single:
+        section = [section]
+    for i in section:
+        if i not in full:
+            i %= Nled
+        np[i] = color
+    np.write()
+
+# get rainbow colors
+# Input a value 0 to 255 to get a color value.
+# The colours are a transition r - g - b - back to r.
+def wheel(pos):
+    
+    if pos < 0 or pos > 255:
+        return (0, 0, 0)
+    if pos < 85:
+        return (255 - pos * 3, pos * 3, 0)
+    if pos < 170:
+        pos -= 85
+        return (0, 255 - pos * 3, pos * 3)
+    pos -= 170
+    return (pos * 3, 0, 255 - pos * 3)
+
+# cycle rainbow colors
+def rainbow_cycle(wait):
+    global button_pressed
+    n = Nled
+    while not button_pressed:
+        for j in range(255):
+            for i in range(n):
+                rc_index = (i * 256 // n) + j
+                np[i] = wheel(rc_index & 255)
+            np.write()
+            if button_pressed:
+                break
+            time.sleep_ms(wait)
+    button_pressed = False
+
+# pulsating rainbow
+def solid_rainbow(wait):
+    global button_pressed
+    while not button_pressed:
+        for j in range(255):
+            paint(wheel(j))
+            if button_pressed:
+                break
+            time.sleep_ms(wait)
+    button_pressed = False
+
+# just a single color
+def solid_color(color):
+    global button_pressed
+    paint(color)
+    while not button_pressed:
+        time.sleep_ms(100)
+    button_pressed = False
+
+# single led rotating
+def chase_single(color, wait):
+    global button_pressed
+    while not button_pressed:
+        for i in full:
+            paint(color, i, True)
+            paint(off, i - 1, True)
+            if button_pressed:
+                break
+            time.sleep_ms(wait)
+    button_pressed = False
+
+while True:
+    rainbow_cycle(5)
+    solid_rainbow(200)
+    chase_single(orange, 50)
+    chase_single(white, 50)
+    chase_single(purple, 50)
+    solid_color(red)
+    solid_color(green)
+    solid_color(blue)
+    
+

wifi_config.py.default

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+# Dict of WiFi networks
+
+NETWORKS = {
+    "my_wifi": {
+        "ssid": "look at me", "password": "password123"
+    },
+    "neighbor_wifi": {
+        "ssid": "get out", "password": "Start#123"
+    }
+}