101 lines
2.7 KiB
Python
101 lines
2.7 KiB
Python
import paho.mqtt.client as mqtt
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import time
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import board
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import busio
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from adafruit_ht16k33 import segments
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__TOPIC_BRIGHTNESS__ = "brightness"
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__TOPIC_SCROLL_INTERVAL__ = "scroll_interval"
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__TOPIC_TEXT__ = "text"
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class Controller:
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connected = False
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display = None
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last_scrollupdate = 0
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def __init__(self, base_topic, mqtt_host, mqtt_port = 1883):
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self.scroll_interval = 0.25
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self.text = " "
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self.poscount = 0
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# Create the I2C interface.
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self.i2c = busio.I2C(board.SCL, board.SDA)
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# Create the LED segment class.
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# This creates a 14 segment 4 character display:
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self.display = segments.Seg14x4(self.i2c)
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# Clear the display.
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self.display.fill(0)
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# set brightness, range 0-1.0, 1.0 max brightness
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self.display.brightness = 1.0
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self.mqtt = mqtt.Client()
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self.mqtt.on_connect = self.on_connect
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self.mqtt.on_message = self.on_message
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self.mqtt.on_disconnect = self.on_disconnect
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self.mqtt.connect(mqtt_host, mqtt_port)
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self.topic = base_topic
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self.display.print("BOOT")
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def on_disconnect(self, client, userdata, rc):
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print("MQTT disconnected")
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self.connected = False
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def on_message(self, client, userdata, message):
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msg = str(message.payload.decode("utf-8"))
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print("msg = " + msg)
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if message.topic.endswith(__TOPIC_BRIGHTNESS__ + "/set"):
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val = float(msg)
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if val >= 0.0 and val <=1.0:
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self.display.brightness = val
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print("changed brightness to ", self.display.brightness)
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self.mqtt.publish(self.topic + "/" + __TOPIC_BRIGHTNESS__, self.display.brightness, 1 )
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else:
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print("invalid brightness ", val)
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if message.topic.endswith(__TOPIC_SCROLL_INTERVAL__ + "/set"):
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val = float(msg)
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if val > 0.0:
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self.scroll_interval = val
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print("changed scroll_interval to ", self.scroll_interval)
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self.mqtt.publish(self.topic + "/" + __TOPIC_SCROLL_INTERVAL__, self.scroll_interval, 1 )
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else:
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print("error not >0.0: ", val)
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if message.topic.endswith(__TOPIC_TEXT__ + "/set"):
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self.poscount = 0 #start at beginning of new text
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self.text = msg
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if len(self.text)==0:
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self.text=" "
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print("changed text to ", self.text)
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self.mqtt.publish(self.topic + "/" + __TOPIC_TEXT__, self.text, 1 )
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def on_connect(self, client, userdata, flags, rc):
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print("Connected to MQTT Broker")
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self.mqtt.subscribe(self.topic + "/#")
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self.connected = True
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def loop_forever(self):
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run = True
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while run:
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self.mqtt.loop(0.1) #with block timeout
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if self.display is not None and time.time() > self.last_scrollupdate+self.scroll_interval:
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self.display.print(self.text[self.poscount])
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self.poscount += 1
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self.poscount %= len(self.text)
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self.last_scrollupdate = time.time()
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