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rpi_weather.py
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rpi_weather.py
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#===============================================================================
# rpi_weather.py
#
# Class for interfacing to Raspberry Pi with four Adafruit 8x8 LEDs attached.
#
# 2015-04-15
# Carter Nelson
#===============================================================================
from time import sleep
from Adafruit_LED_Backpack import Matrix8x8
from led8x8icons import LED8x8ICONS
class RpiWeather():
"""Class for interfacing to Raspberry Pi with four Adafruit 8x8 LEDs attached."""
def __init__(self, ):
self.matrix = []
self.matrix.append(Matrix8x8.Matrix8x8(address=0x70, busnum=1))
self.matrix.append(Matrix8x8.Matrix8x8(address=0x71, busnum=1))
self.matrix.append(Matrix8x8.Matrix8x8(address=0x72, busnum=1))
self.matrix.append(Matrix8x8.Matrix8x8(address=0x73, busnum=1))
for m in self.matrix:
try :
m.begin()
m.set_brightness(1)
except :
self.matrix.remove(m)
pass
def is_valid_matrix(self, matrix):
"""Returns True if matrix number is valid, otherwise False."""
return matrix in xrange(len(self.matrix))
def clear_disp(self, matrix=None):
"""Clear specified matrix. If none specified, clear all."""
if matrix == None:
for m in self.matrix:
m.clear()
m.write_display()
else:
if not self.is_valid_matrix(matrix):
return
self.matrix[matrix].clear()
self.matrix[matrix].write_display()
def set_pixel(self, x, y, matrix=0, value=1):
"""Set pixel at position x, y for specified matrix to the given value."""
if not self.is_valid_matrix(matrix):
return
self.matrix[matrix].set_pixel(x, y, value)
self.matrix[matrix].write_display()
def set_bitmap(self, bitmap, matrix=0):
"""Set specified matrix to provided bitmap."""
if not self.is_valid_matrix(matrix):
return
for x in xrange(8):
for y in xrange(8):
self.matrix[matrix].set_pixel(x, y, bitmap[y][x])
self.matrix[matrix].write_display()
def set_raw64(self, value, matrix=0):
"""Set specified matrix to bitmap defined by 64 bit value."""
if not self.is_valid_matrix(matrix):
return
self.matrix[matrix].clear()
for y in xrange(8):
row_byte = value >> (8*y)
for x in xrange(8):
pixel_bit = row_byte >> x & 0x01
self.matrix[matrix].set_pixel(x, y, pixel_bit)
self.matrix[matrix].write_display()
def scroll_raw64(self, value, matrix=0, delay=0.15):
"""Scroll out the current bitmap with the supplied bitmap. Can also
specify a matrix (0-3) and a delay to set scroll rate.
"""
for step in xrange(7,-1,-1):
for old_row in xrange(7,0,-1):
self.matrix[matrix].buffer[old_row*2] = self.matrix[matrix].buffer[(old_row-1)*2]
new_row = (value >> (8*step)) & 0xff
new_row = (new_row << 7 | new_row >> 1) & 0xff #fix for memory buffer error
self.matrix[matrix].buffer[0] = new_row
self.matrix[matrix].write_display()
sleep(delay)
def disp_number(self, number):
"""Display number as integer. Valid range is 0 to 9999."""
num = int(number)
if num > 9999 or num < 0:
return
self.clear_disp()
matrix = 3
while num:
digit = num % 10
self.set_raw64(LED8x8ICONS['{0}'.format(digit)], matrix)
num /= 10
matrix -= 1
def disp_temp(self, number, scroll=True):
"""Display number as integer. Valid range is 0 to 99."""
num = int(number)
self.clear_disp(1)
self.clear_disp(2)
if num < 0:
return
if num > 99:
num = 99
matrix = 2
while num:
digit = num % 10
if scroll:
self.scroll_raw64(LED8x8ICONS['{0}'.format(digit)], matrix)
else:
self.set_raw64(LED8x8ICONS['{0}'.format(digit)], matrix)
num /= 10
matrix -= 1