adafruit · jose1711 · Aug 5, 2015 · Aug 6, 2015 · Aug 27, 2015 · Aug 27, 2015
diff --git a/Adafruit_LEDBackpack/Adafruit_14Segment.py b/Adafruit_LEDBackpack/Adafruit_14Segment.py
@@ -0,0 +1,205 @@
+#!/usr/bin/python
+
+import time
+import datetime
+from Adafruit_LEDBackpack import LEDBackpack
+
+# ===========================================================================
+# 14-Segment Display
+# ===========================================================================
+
+#   11111111111111
+# 32           1  2
+# 32  2   5   0   2
+# 32   5  1  2    2
+# 32    6 2 4     2
+#     64      128
+# 16    2 4 8     4
+# 16   0  0  1    4
+# 16  4   9   9   4
+# 16 8    6    2  4
+#   88888888888888   16384
+
+
+
+# This class is meant to be used with the four-character, fourteen segment
+# displays available from Adafruit
+
+class FourteenSegment:
+  disp = None
+
+  # Hexadecimal character lookup table (row 1 = 0..9, row 2 = A..F)
+  digits = [ 0x3F, 0x06, 0xDB, 0xCF, 0xE6, 0xED, 0xFD, 0x07, 0xFF, 0xEF, \
+             0xF7, 0xFC, 0x39, 0xDE, 0x79, 0x71 ]
+
+  chars = [
+0x1,    #
+0x2,    #
+0x4,    #
+0x8,    #
+0x10,   #
+0x20,   #
+0x40,   #
+0x80,   #
+0x100,  #
+0x200,  #
+0x400,  #
+0x800,  #
+0x1000, #
+0x2000, #
+0x4000, #
+0x8000, #
+0x0,    #
+0x0,    #
+0x0,    #
+0x0,    #
+0x0,    #
+0x0,    #
+0x0,    #
+0x0,    #
+0x12c9, #
+0x15c0, #
+0x12f9, #
+0xe3,   #
+0x530,  #
+0x12c8, #
+0x3a00, #
+0x1700, #
+0x0,    # 
+0x6,    # !
+0x220,  # "
+0x12ce, # #
+0x12ed, # $
+0xc24,  # %
+0x235d, # &
+0x400,  # '
+0x2400, # (
+0x900,  # )
+0x3fc0, # *
+0x12c0, # +
+0x800,  # ,
+0xc0,   # -
+0x0,    # .
+0xc00,  # /
+0xc3f,  # 0
+0x6,    # 1
+0xdb,   # 2
+0x8f,   # 3
+0xe6,   # 4
+0x2069, # 5
+0xfd,   # 6
+0x7,    # 7
+0xff,   # 8
+0xef,   # 9
+0x1200, # :
+0xa00,  # ;
+0x2400, # <
+0xc8,   # =
+0x900,  # >
+0x1083, # ?
+0x2bb,  # @
+0xf7,   # A
+0x128f, # B
+0x39,   # C
+0x120f, # D
+0xf9,   # E
+0x71,   # F
+0xbd,   # G
+0xf6,   # H
+0x1200, # I
+0x1e,   # J
+0x2470, # K
+0x38,   # L
+0x536,  # M
+0x2136, # N
+0x3f,   # O
+0xf3,   # P
+0x203f, # Q
+0x20f3, # R
+0xed,   # S
+0x1201, # T
+0x3e,   # U
+0xc30,  # V
+0x2836, # W
+0x2d00, # X
+0x1500, # Y
+0xc09,  # Z
+0x39,   # [
+0x2100, #
+0xf,    # ]
+0xc03,  # ^
+0x8,    # _
+0x100,  # `
+0x1058, # a
+0x2078, # b
+0xd8,   # c
+0x88e,  # d
+0x858,  # e
+0x71,   # f
+0x48e,  # g
+0x1070, # h
+0x1000, # i
+0xe,    # j
+0x3600, # k
+0x30,   # l
+0x10d4, # m
+0x1050, # n
+0xdc,   # o
+0x170,  # p
+0x486,  # q
+0x50,   # r
+0x2088, # s
+0x78,   # t
+0x1c,   # u
+0x2004, # v
+0x2814, # w
+0x28c0, # x
+0x200c, # y
+0x848,  # z
+0x949,  # {
+0x1200, # |
+0x2489, # }
+0x520,  # ~
+0x3fff  #
+]
+
+  # Constructor
+  def __init__(self, address=0x70, debug=False):
+    if (debug):
+      print "Initializing a new instance of LEDBackpack at 0x%02X" % address
+    self.disp = LEDBackpack(address=address, debug=debug)
+
+  def writeDigitRaw(self, charNumber, value):
+    "Sets a digit using the raw 16-bit value"
+    if (charNumber > 7):
+      return
+    # Set the appropriate digit
+    self.disp.setBufferRow(charNumber, value)
+
+  def writeDigit(self, charNumber, value, dot=False):
+    "Sets a single decimal or hexademical value (0..9 and A..F)"
+    if (charNumber > 7):
+      return
+    if (value > 0xF):
+      return
+    # Set the appropriate digit
+    self.disp.setBufferRow(charNumber, self.digits[value] | (dot << 14))
+
+  def writeChar(self, charNumber, value, dot=False):
+    "Writes an ascii character on the screen"
+    if (charNumber > 7):
+      return
+    # Set the appropriate character
+    self.disp.setBufferRow(charNumber, self.chars[ord(value)] | (dot << 14))
+
+
+  def setColon(self, state=True):
+    "Enables or disables the colon character"
+    # Warning: This function assumes that the colon is character '2',
+    # which is the case on 4 char displays, but may need to be modified
+    # if another display type is used
+    if (state):
+      self.disp.setBufferRow(2, 0x4000)
+    else:
+      self.disp.setBufferRow(2, 0)
+
diff --git a/Adafruit_LEDBackpack/ex_14segment_asciichars.py b/Adafruit_LEDBackpack/ex_14segment_asciichars.py
@@ -0,0 +1,43 @@
+#!/usr/bin/python
+
+import time
+import datetime
+import sys
+from Adafruit_14Segment import FourteenSegment
+from Adafruit_LEDBackpack import LEDBackpack
+
+# ===========================================================================
+# Ascii characters enumeration - tests all segments and LCD dimming
+# ===========================================================================
+lcd = LEDBackpack(address=0x70)
+segment = FourteenSegment(address=0x70)
+print "Press CTRL+Z to exit"
+
+for pos in range(127):
+  segment.writeChar(0,chr(pos))
+  segment.writeChar(1,chr(pos))
+  segment.writeChar(2,chr(pos))
+  segment.writeChar(3,chr(pos))
+  time.sleep(0.3)
+
+byeword="Done     "
+for pos in range(4):
+  segment.writeChar(pos,byeword[pos])
+
+# demoes dimming function
+for level in range(16):
+  lcd.setBrightness(level)
+  time.sleep(0.3)
+
+for level in reversed(range(16)):
+  lcd.setBrightness(level)
+  time.sleep(0.3)
+
+# make byeword scroll away
+for c in range(5):
+  segment.writeChar(0,byeword[0])
+  segment.writeChar(1,byeword[1])
+  segment.writeChar(2,byeword[2])
+  segment.writeChar(3,byeword[3])
+  byeword=byeword[1:]
+  time.sleep(0.3)
diff --git a/Adafruit_LEDBackpack/ex_14segment_clock.py b/Adafruit_LEDBackpack/ex_14segment_clock.py
@@ -0,0 +1,31 @@
+#!/usr/bin/python
+
+import time
+import datetime
+from Adafruit_14Segment import FourteenSegment
+
+# ===========================================================================
+# Clock Example
+# ===========================================================================
+segment = FourteenSegment(address=0x70)
+
+print "Press CTRL+Z to exit"
+
+# Continually update the time on a 4 char, 14-segment display
+while(True):
+  now = datetime.datetime.now()
+  hour = now.hour
+  minute = now.minute
+  second = now.second
+  # Set hours
+  segment.writeDigit(0, int(hour / 10))     # Tens
+  # Set minutes
+  segment.writeDigit(2, int(minute / 10))   # Tens
+  segment.writeDigit(3, minute % 10)        # Ones
+  # Toggle colon
+  if second % 2:
+    segment.writeDigit(1, hour % 10, True)    # Ones, dot on
+  else:
+    segment.writeDigit(1, hour % 10)          # Ones, dot off
+  # Wait one second
+  time.sleep(1)
diff --git a/Adafruit_LEDBackpack/ex_14segment_one_digit_clock.sh b/Adafruit_LEDBackpack/ex_14segment_one_digit_clock.sh
@@ -0,0 +1,99 @@
+#!/bin/bash
+# uses one 14-segment character on LCD BackPack from Adafruit
+# to display current system time. accuracy is +-3.75 minutes
+#
+# time display is implemented as follows:
+#  inner segments indicates direction of a longer hand on an analog clock
+#  each outer segment lit counts for 2 hours, if a decimal dot is lit it adds another one hour
+#  furthermore outer segments are enabled in such a way to resemble the shape of a respective number
+#
+#  example:
+#
+# all segments off
+# :-------:
+# : : : : :
+# :  :::  :
+#  --- --- 
+# :  :::  :
+# : : : : :
+# :-------: :
+#
+# 7 hours (am or pm) and around 7.5 minutes
+# :ooooooo:
+# : : : o o
+# :  ::o  o
+#  --- ---
+# :  :::  o
+# : : : : o
+# :-------: o
+#
+# around quarter to 1
+# :-------:
+# : : : : :
+# :  :::  :
+#  ooo --- 
+# :  :::  :
+# : : : : :
+# :-------: :
+#
+# when started without arguments it displays the current time. argument "demo" starts a continous cycle
+# where in each iteration additional minute is added to time and shown on both stdout and LCD.
+# this can give you an better idea how indication of time works.
+
+
+#trap 'echo -e "\e0;$BASH_COMMAND\007"' DEBUG
+address=0x70
+bus=0
+# which character to use (counted from 0)
+pos=0
+
+digitsmin=(512 1536 1024 1152 128 8320 8192 12288 4096 6144 2048 2112 64 320 256 768 768)
+digitshrs=(0 16384 1 16385 36 16417 56 16391 51 16423 59 16443 63)
+
+# set brightness to low
+sudo i2cset -y ${bus} "${address}" 0xe0
+
+demo=0
+min=1
+if [ "$1" = "demo" ]
+	then
+	echo "demo mode set"
+	demo=1
+	fi
+
+echo "Clock invoked"
+while :
+	do
+	if [ "${demo}" -eq 1 ]
+		then
+		DATEARGS="-d now + ${min} minutes"
+		read hours minutes seconds < <(date "$DATEARGS" '+%I %M %S' | sed 's/\b0//g')
+		echo "displaying $hours:$minutes:$seconds"
+		min=$((min+1))
+		else
+		read hours minutes seconds < <(date '+%I %M %S' | sed 's/\b0//g')
+		fi
+
+	if [ ${minutes} -gt 58 ]
+		then
+		minutes=0
+		fi
+
+	# better accuracy now
+	minutes=$(perl -e 'print '$minutes'+'$seconds'/60')
+	indexm=$(perl -e 'print int((('${minutes}'-1.875)/3.75+1))')
+
+	maskm=${digitsmin[$indexm]}
+	maskh=${digitshrs[$hours]}
+	mask=$((maskm | maskh))
+	if [ "${mask}" != "${lastmask}" ]
+		then
+		sudo i2cset -y ${bus} "${address}" $((${pos}*2)) ${mask} w
+		lastmask=$mask
+		fi
+
+	if [ "${demo}" -ne 1 ]
+		then
+		break
+		fi
+	done