init

main.py

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+import time
+from umqttsimple import MQTTClient
+import ubinascii
+import machine
+import micropython
+import network
+import esp
+from machine import Pin
+from utime import sleep_ms
+from neopixel import NeoPixel
+
+
+esp.osdebug(None)
+import gc
+gc.collect()
+
+ssid = 'your_ssid'
+password = 'your_password'
+mqtt_server = 'mqtt_server_ip'
+#EXAMPLE IP ADDRESS
+#mqtt_server = '192.168.1.144'
+client_id = ubinascii.hexlify(machine.unique_id())
+topic_sub = b'notification'
+topic_pub = b'power/power_03/cmnd/Power'
+
+last_message = 0
+message_interval = 5
+counter = 0
+
+button = Pin(14, Pin.IN, Pin.PULL_UP) # D5
+PIXELS = 10
+np = NeoPixel(Pin(12, Pin.OUT), PIXELS) # Pixel on pin 22 (D6), lenght=10
+
+station = network.WLAN(network.STA_IF)
+
+station.active(True)
+station.connect(ssid, password)
+
+while station.isconnected() == False:
+    pass
+
+print('Connection successful')
+print(station.ifconfig())
+
+
+def check_pin():
+    if not button.value():
+        print("Woha! Someone pressed the button!")
+        return(1)
+    else:
+        return(0)
+    
+
+def translate(value, leftMin, leftMax, rightMin, rightMax):
+    '''
+    Translates a value from one range to another.
+    Borrowed from: https://stackoverflow.com/questions/1969240/mapping-a-range-of-values-to-another
+    '''
+    # Figure out how 'wide' each range is
+    leftSpan = leftMax - leftMin
+    rightSpan = rightMax - rightMin
+
+    # Convert the left range into a 0-1 range (float)
+    valueScaled = float(value - leftMin) / float(leftSpan)
+
+    # Convert the 0-1 range into a value in the right range.
+    return int(rightMin + (valueScaled * rightSpan))
+
+
+def sub_cb(topic, msg):
+    print((topic, msg))
+
+
+def connect_and_subscribe():
+    global client_id, mqtt_server, topic_sub
+    client = MQTTClient(client_id, mqtt_server)
+    client.set_callback(sub_cb)
+    client.connect()
+    client.subscribe(topic_sub)
+    print('Connected to %s MQTT broker, subscribed to %s topic' % (mqtt_server, topic_sub))
+    return client
+
+
+def restart_and_reconnect():
+    print('Failed to connect to MQTT broker. Reconnecting...')
+    time.sleep(10)
+    machine.reset()
+
+
+try:
+    client = connect_and_subscribe()
+except OSError as e:
+    restart_and_reconnect()
+
+
+POWERSTATE = False
+WATER_TIME = 120
+START_TIME = time.time()
+client.publish(topic_pub, b'OFF')
+
+while True:
+    try:
+        new_message = client.check_msg()
+        if new_message != 'None':
+        
+            # Check for button push
+            if check_pin():
+                START_TIME = time.time()
+                client.publish(topic_pub, b'ON')
+                POWERSTATE = True
+                sleep_ms(500)
+            
+            # Check if timer has run out
+            if (time.time() - START_TIME) > WATER_TIME:
+                if POWERSTATE:
+                    client.publish(topic_pub, b'OFF')
+                    print("Time is up.!")
+                    POWERSTATE = False
+            
+            #If water is running, show time left on LEDs 
+            if POWERSTATE:
+                for i in range(PIXELS):
+                    np[i] = (0, 0, 0)
+                #time_left = WATER_TIME - (time.time() - START_TIME)
+                i = translate((time.time() - START_TIME), 0, WATER_TIME, 0, PIXELS-1)
+                np[i] = (20,20,20)
+            else:
+                for i in range(PIXELS):
+                    np[i] = (0, 0, 0)
+            np.write()
+
+    except OSError as e:
+        restart_and_reconnect()