Support for 4-digit TM1637 display
Opened this issue · 10 comments
thijstriemstra commented
Recently got one of these 4 Bits TM1637 Digital Tube LED Clock displays. Would be cool to support this in luma.led_matrix.
thijstriemstra commented
I've ordered one for you @rm-hull if you want to play around with it.
twdkeule commented
I already encountered this while looking to buy one: raspberrytips.nl
Also found this on github
thijstriemstra commented
Ok. It uses wiringPi2. Thanks for info though.
rm-hull commented
@thijstriemstra - Package arrived today
thijstriemstra commented
Yay nice :) @rm-hull any luck getting it to work?
rm-hull commented
I connected this up, but not getting anything displayed (connected to an RPi Zero) using the scripts from https://raspberrytips.nl/tm1637-4-digit-led-display-raspberry-pi/
Not sure if it's a dud or something specific to the pi zero.
thijstriemstra commented
Here's an arduino reference library with a wiring table: https://github.com/bremme/arduino-tm1637
Hardware setup
| TM1637 PIN | Arduino PIN | Description |
|---|---|---|
| CLK | Any digital pin | Clock |
| DIO | Any digital pin | Digital output |
| VCC | 5V | Supply voltage |
| GND | GND | Ground |
And using https://github.com/johnlr/raspberrypi-tm1637 I couldn't get it to work with CLK on gpio 21 and DIO on 20.
thijstriemstra commented
Maybe this is easy to port.. https://github.com/blueSolder/tm1637-Chip/blob/master/tm1637_Chip.py
thijstriemstra commented
Also couldn't get https://raspberrytips.nl/tm1637-4-digit-led-display-raspberry-pi/ to work. @twdkeule did you get it to work?
thijstriemstra commented
any chance we can resurrect this @rm-hull? :) one of my most used projects uses this display and it feels weird to use a 'third-party' library for this, I'd love to use luma for this.
Update: I thought I was using a library but turns out it's some code I copy/pasted from somewhere, don't remember where. Anyway, here it is:
import math
import logging
import threading
from time import sleep, localtime
from ..utils import GPIO as IO
logger = logging.getLogger(__name__)
HexDigits = [0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F,
0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71, 0x3D, 0x76,
0x06, 0x1E, 0x76, 0x38, 0x55, 0x54, 0x3F, 0x73, 0x67,
0x50, 0x6D, 0x78, 0x3E, 0x1C, 0x2A, 0x76, 0x6E, 0x5B,
0x00, 0x40, 0x63, 0xFF]
ADDR_AUTO = 0x40
ADDR_FIXED = 0x44
STARTADDR = 0xC0
# DEBUG = False
class TM1637:
"""
TM1637is a kind of LED (light-emitting diodedisplay) drive control special
circuit with keyboard scan interface and it's internally integrated with
MCU digital interface, data latch, LED high pressure drive and keyboard
scan. Mainly used in small household electrical appliances.
"""
__doublePoint = False
__Clkpin = 0
__Datapin = 0
__brightness = 1.0 # default to max brightness
__currentData = [0, 0, 0, 0]
def __init__(self, CLK, DIO, brightness):
self.__Clkpin = CLK
self.__Datapin = DIO
self.__brightness = brightness
IO.setup(self.__Clkpin, IO.OUT)
IO.setup(self.__Datapin, IO.OUT)
def cleanup(self):
"""Stop updating clock, turn off display, and cleanup GPIO"""
self.StopClock()
self.Clear()
IO.cleanup()
def Clear(self):
b = self.__brightness
point = self.__doublePoint
self.__brightness = 0
self.__doublePoint = False
data = [0x7F, 0x7F, 0x7F, 0x7F]
self.Show(data)
# Restore previous settings:
self.__brightness = b
self.__doublePoint = point
def ShowInt(self, i):
s = str(i)
self.Clear()
for i in range(0, len(s)):
self.Show1(i, int(s[i]))
def Show(self, data):
for i in range(0, 4):
self.__currentData[i] = data[i]
self.start()
self.writeByte(ADDR_AUTO)
self.br()
self.writeByte(STARTADDR)
for i in range(0, 4):
self.writeByte(self.coding(data[i]))
self.br()
self.writeByte(0x88 + int(self.__brightness))
self.stop()
def Show1(self, DigitNumber, data):
"""show one Digit (number 0...3)"""
if(DigitNumber < 0 or DigitNumber > 3):
return # error
self.__currentData[DigitNumber] = data
self.start()
self.writeByte(ADDR_FIXED)
self.br()
self.writeByte(STARTADDR | DigitNumber)
self.writeByte(self.coding(data))
self.br()
self.writeByte(0x88 + int(self.__brightness))
self.stop()
# Scrolls any integer n (can be more than 4 digits) from right to left display.
def ShowScroll(self, n):
n_str = str(n)
k = len(n_str)
for i in range(0, k + 4):
if (i < k):
self.Show([int(n_str[i-3]) if i-3 >= 0 else None, int(n_str[i-2]) if i-2 >= 0 else None, int(n_str[i-1]) if i-1 >= 0 else None, int(n_str[i]) if i >= 0 else None])
elif (i >= k):
self.Show([int(n_str[i-3]) if (i-3 < k and i-3 >= 0) else None, int(n_str[i-2]) if (i-2 < k and i-2 >= 0) else None, int(n_str[i-1]) if (i-1 < k and i-1 >= 0) else None, None])
sleep(1)
def SetBrightness(self, percent):
"""Accepts percent brightness from 0 - 1"""
max_brightness = 7.0
brightness = math.ceil(max_brightness * percent)
if (brightness < 0):
brightness = 0
if(self.__brightness != brightness):
self.__brightness = brightness
self.Show(self.__currentData)
def ShowDoublepoint(self, on):
"""Show or hide double point divider"""
if(self.__doublePoint != on):
self.__doublePoint = on
self.Show(self.__currentData)
def writeByte(self, data):
for i in range(0, 8):
IO.output(self.__Clkpin, IO.LOW)
if(data & 0x01):
IO.output(self.__Datapin, IO.HIGH)
else:
IO.output(self.__Datapin, IO.LOW)
data = data >> 1
IO.output(self.__Clkpin, IO.HIGH)
# wait for ACK
IO.output(self.__Clkpin, IO.LOW)
IO.output(self.__Datapin, IO.HIGH)
IO.output(self.__Clkpin, IO.HIGH)
IO.setup(self.__Datapin, IO.IN)
while(IO.input(self.__Datapin)):
sleep(0.001)
if(IO.input(self.__Datapin)):
IO.setup(self.__Datapin, IO.OUT)
IO.output(self.__Datapin, IO.LOW)
IO.setup(self.__Datapin, IO.IN)
IO.setup(self.__Datapin, IO.OUT)
def start(self):
"""send start signal to TM1637"""
IO.output(self.__Clkpin, IO.HIGH)
IO.output(self.__Datapin, IO.HIGH)
IO.output(self.__Datapin, IO.LOW)
IO.output(self.__Clkpin, IO.LOW)
def stop(self):
IO.output(self.__Clkpin, IO.LOW)
IO.output(self.__Datapin, IO.LOW)
IO.output(self.__Clkpin, IO.HIGH)
IO.output(self.__Datapin, IO.HIGH)
def br(self):
"""terse break"""
self.stop()
self.start()
def coding(self, data):
if(self.__doublePoint):
pointData = 0x80
else:
pointData = 0
if(data == 0x7F or data is None):
data = 0
else:
data = HexDigits[data] + pointData
return data
def clock(self, military_time):
"""Clock script modified from:
https://github.com/johnlr/raspberrypi-tm1637"""
self.ShowDoublepoint(True)
while (not self.__stop_event.is_set()):
t = localtime()
hour = t.tm_hour
if not military_time:
hour = 12 if (t.tm_hour % 12) == 0 else t.tm_hour % 12
d0 = hour // 10 if hour // 10 else 36
d1 = hour % 10
d2 = t.tm_min // 10
d3 = t.tm_min % 10
digits = [d0, d1, d2, d3]
self.Show(digits)
# # Optional visual feedback of running alarm:
# print digits
# for i in tqdm(range(60 - t.tm_sec)):
for i in range(60 - t.tm_sec):
if (not self.__stop_event.is_set()):
sleep(1)
def StartClock(self, military_time=True):
# Stop event based on: http://stackoverflow.com/a/6524542/3219667
self.__stop_event = threading.Event()
self.__clock_thread = threading.Thread(
target=self.clock, args=(military_time,))
self.__clock_thread.start()
def StopClock(self):
try:
logger.info('Attempting to stop live clock')
self.__stop_event.set()
except:
logger.info('No clock to close')
class TM1637Display(object):
"""
"""
display = None
msg = None
def __init__(self, clk_pin, dio_pin, brightness=1.0):
self.clk_pin = clk_pin
self.dio_pin = dio_pin
self.brightness = brightness
if IO:
self.display = TM1637(
CLK=self.clk_pin,
DIO=self.dio_pin,
brightness=self.brightness
)
self.clear()
def clear(self):
if IO:
self.display.Clear()
def setBrightness(self, brightness):
if IO:
self.display.SetBrightness(brightness)
def write(self, msg):
if IO:
if msg != self.msg:
self.msg = msg
self.clear()
start_pos = 0
if len(msg) == 2:
start_pos = 1
for index, ch in enumerate(msg):
self.display.Show1(start_pos + index, int(ch))
def startup(self):
if IO:
self.setBrightness(0)
self.write('0000')