mqtt_pi_led-display/src/controller.py

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import paho.mqtt.client as mqtt
import time
import board
import busio
from adafruit_ht16k33 import segments
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from enum import Enum
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__TOPIC_BRIGHTNESS__ = "brightness"
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__TOPIC_SCROLL_INTERVAL__ = "scrollinterval"
__TOPIC_TEXT_STATIC__ = "textstatic"
__TOPIC_TEXT_ONCE__ = "textonce"
__TOPIC_TEXT_SCROLL__ = "textscroll"
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__TOPIC_TEXT_MARQUEE__ = "textmarquee"
__TOPIC_TEXT_PAN__ = "textpan"
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NUMDIGITS = 8
class Mode(Enum):
STATIC = 1 #show text constantly. may cut digits
ONCE = 3 #show once for some time
SCROLL = 2 #scroll thorugh once
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PAN = 4 #scroll back and forth
MARQUEE = 5
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class Controller:
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connected = False
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displayL = None
displayR = None
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def __init__(self, base_topic, mqtt_host, mqtt_port = 1883):
self.scroll_interval = 0.25
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self.text = " "
self.text_last = ""
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self.poscount = 0
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self.last_scrollupdate = 0
self.mode = Mode.STATIC
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# Create the I2C interface.
self.i2c = busio.I2C(board.SCL, board.SDA)
# Create the LED segment class.
# This creates a 14 segment 4 character display:
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self.displayL = segments.Seg14x4(self.i2c, address=0x70) # find address with "sudo i2cdetect -y 1" . you need to install: sudo apt-get install -y python-smbus i2c-tools
self.displayR = segments.Seg14x4(self.i2c, address=0x71)
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# Clear the display.
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self.displayL.fill(0)
self.displayR.fill(0)
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# set brightness, range 0-1.0, 1.0 max brightness
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self.displayL.brightness = 1.0
self.displayR.brightness = 1.0
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self.mqtt = mqtt.Client()
self.mqtt.on_connect = self.on_connect
self.mqtt.on_message = self.on_message
self.mqtt.on_disconnect = self.on_disconnect
self.mqtt.connect(mqtt_host, mqtt_port)
self.topic = base_topic
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self.displayL.print("LEFT")
self.displayR.print("RIGH")
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def on_disconnect(self, client, userdata, rc):
print("MQTT disconnected")
self.connected = False
def on_message(self, client, userdata, message):
msg = str(message.payload.decode("utf-8"))
print("msg = " + msg)
if message.topic.endswith(__TOPIC_BRIGHTNESS__ + "/set"):
val = float(msg)
if val >= 0.0 and val <=1.0:
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self.displayL.brightness = val
self.displayR.brightness = val
print("changed brightness to ", self.displayL.brightness)
self.mqtt.publish(self.topic + "/" + __TOPIC_BRIGHTNESS__, self.displayL.brightness, 1 )
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else:
print("invalid brightness ", val)
if message.topic.endswith(__TOPIC_SCROLL_INTERVAL__ + "/set"):
val = float(msg)
if val > 0.0:
self.scroll_interval = val
print("changed scroll_interval to ", self.scroll_interval)
self.mqtt.publish(self.topic + "/" + __TOPIC_SCROLL_INTERVAL__, self.scroll_interval, 1 )
else:
print("error not >0.0: ", val)
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if message.topic.endswith(__TOPIC_TEXT_STATIC__ + "/set"):
self.mode = Mode.STATIC
self.text = msg.ljust(NUMDIGITS)
print("changed text to ", self.text)
self.mqtt.publish(self.topic + "/" + __TOPIC_TEXT_STATIC__, self.text, 1 )
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if message.topic.endswith(__TOPIC_TEXT_MARQUEE__ + "/set"):
self.mode = Mode.MARQUEE
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self.poscount = 0 #start at beginning of new text
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self.text = msg
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for i in range(NUMDIGITS):
self.text = " "+self.text+" " #add spaces left and right for marquee to enter and leave the full frame
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print("changed text to ", self.text)
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self.mqtt.publish(self.topic + "/" + __TOPIC_TEXT_MARQUEE__, self.text, 1 )
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if message.topic.endswith(__TOPIC_TEXT_PAN__ + "/set"):
self.mode = Mode.PAN
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self.poscount = 0 #start at beginning of new text
self.text = msg
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for i in range(int(NUMDIGITS/4)):
self.text = " "+self.text+" " #add spaces left and right for marquee to enter and leave the full frame
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print("changed text to ", self.text)
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self.mqtt.publish(self.topic + "/" + __TOPIC_TEXT_PAN__, self.text, 1 )
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if message.topic.endswith(__TOPIC_TEXT_SCROLL__ + "/set"):
self.mode = Mode.SCROLL
self.poscount = 0 #start at beginning of new text
self.text = msg
for i in range(NUMDIGITS):
self.text = " "+self.text+" " #add spaces left and right for marquee to enter and leave the full frame
print("changed text to ", self.text)
self.mqtt.publish(self.topic + "/" + __TOPIC_TEXT_SCROLL__, self.text, 1 )
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def on_connect(self, client, userdata, flags, rc):
print("Connected to MQTT Broker")
self.mqtt.subscribe(self.topic + "/#")
self.connected = True
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def writeSegment(self, _digit, _char, clear=False):
if _digit>=0 and _digit<4:
if clear:
self.displayL[_digit]=' '
self.displayL[_digit] = _char
elif _digit<8:
if clear:
self.displayR[_digit-4]=' '
self.displayR[_digit-4] = _char
def displayTextOffset(self, _text, _offset = 0):
# This function is needed because library print functions only work for a single display module. This function handles the '.' character with its special cases.
_text+=" " #append NUMDIGITS spaces at end for when scrolling past end
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_text=_text[_offset:] #move by offset
i=0 #counter for reading pos
d=0 #counter for writing segment pos
while d<NUMDIGITS and i<len(_text):
if _text[i]=='.' and _text[max(0,i-1)]=='.': #is dot and was before (or is at start)
self.writeSegment(d,_text[i],True)
d+=1
i+=1
else:
if _text[i]!='.' : #normal char
self.writeSegment(d,_text[i])
i+=1
if i<len(_text):
if _text[i]=='.': #dot, but can be appended to last char
self.writeSegment(d,_text[i])
i+=1
d+=1
def seglen(self, _text): #len function but optimized for 14-segment display
i=0 #counter for reading pos
d=0 #counter for writing segment pos
while i<len(_text):
if _text[i]=='.' and _text[max(0,i-1)]=='.': #is dot and was before (or is at start)
d+=1
i+=1
else:
if _text[i]!='.' : #normal char
i+=1
if i<len(_text):
if _text[i]=='.': #dot, but can be appended to last char
i+=1
d+=1
return d
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def loop_forever(self):
run = True
while run:
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self.mqtt.loop(0.1) #with block timeout
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if self.displayL is not None and self.displayR is not None: #displays initialized
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if self.mode == Mode.STATIC:
if self.text != self.text_last: #time to update animation
self.displayTextOffset(self.text, 0)
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if self.mode == Mode.MARQUEE or self.mode == Mode.SCROLL:
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if time.time() > self.last_scrollupdate+self.scroll_interval or self.text != self.text_last: #time to update animation
self.displayTextOffset(self.text, self.poscount)
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self.poscount += 1
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if self.mode == Mode.MARQUEE:
self.poscount %= max(1,int(self.seglen(self.text)-NUMDIGITS+1))
elif self.mode == Mode.SCROLL:
if self.poscount >= max(1,int(self.seglen(self.text)-NUMDIGITS+1)): #reached end for scroll once
self.mode == Mode.STATIC
self.text=" ".ljust(NUMDIGITS) #empty
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self.last_scrollupdate = time.time()
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if self.mode == Mode.PAN:
if time.time() > self.last_scrollupdate+self.scroll_interval or self.text != self.text_last: #time to update animation
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print("pos=", self.poscount)
scrolloffset = self.poscount
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if scrolloffset >= (self.seglen(self.text)-NUMDIGITS):
scrolloffset = (self.seglen(self.text)-NUMDIGITS) - (scrolloffset-(self.seglen(self.text)-NUMDIGITS)) #reverse
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scrolloffset = max(0,scrolloffset) #cap at zero
print("scrolloffset=", scrolloffset)
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self.displayTextOffset(self.text, scrolloffset)
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self.poscount += 1
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self.poscount %= (self.seglen(self.text)-NUMDIGITS)*2 #if poscount over scrollable width means scroll backwards
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self.last_scrollupdate = time.time()
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self.text_last = self.text