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display.py
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"""
A Wrapper for the sparkfun LCD display library to help display datapoints.
"""
from sparkfun_serlcd import Sparkfun_SerLCD_I2C
class LCD_16x2(Sparkfun_SerLCD_I2C):
def __init__(self, i2c):
Sparkfun_SerLCD_I2C.__init__(self, i2c)
self.set_fast_backlight_rgb(255, 255, 255)
self.clear()
# initialise variables for show_data_*() functions
self.labels = ['','','','','','','','']
self.values = ['','','','','','','','']
self.page = False
def show_text(self, text):
self.clear()
self.write(text)
# ----------------------------------
# show_data_16x2()
# A helper function to display 8 strings, typically 4 labels and 4 data
# points.
# Intended for use with 16x2 LCD
# Can toggle pages to show a different set of data
def show_data(self, toggle=False):
if toggle:
self.page = not self.page
l = self.labels
v = self.values
if not self.page:
# prints labels and values, forcing 4 characters wide
self.set_cursor(0,0)
self.write(f'{l[0]:>4}'[:4])
self.write(f'{v[0]:<4}'[:4])
self.set_cursor(8,0)
self.write(f'{l[1]:>4}'[:4])
self.write(f'{v[1]:<4}'[:4])
self.set_cursor(0,1)
self.write(f'{l[2]:>4}'[:4])
self.write(f'{v[2]:<4}'[:4])
self.set_cursor(8,1)
self.write(f'{l[3]:>4}'[:4])
self.write(f'{v[3]:<4}'[:4])
if self.page:
self.set_cursor(0,0)
self.write(f'{l[4]:>4}'[:4])
self.write(f'{v[4]:<4}'[:4])
self.set_cursor(8,0)
self.write(f'{l[5]:>4}'[:4])
self.write(f'{v[5]:<4}'[:4])
self.set_cursor(0,1)
self.write(f'{l[6]:>4}'[:4])
self.write(f'{v[6]:<4}'[:4])
self.set_cursor(8,1)
self.write(f'{l[7]:>4}'[:4])
self.write(f'{v[7]:<4}'[:4])
class LCD_20x4(Sparkfun_SerLCD_I2C):
def __init__(self, i2c):
Sparkfun_SerLCD_I2C.__init__(self, i2c)
self.set_fast_backlight_rgb(255, 255, 255)
self.clear()
# initialise variables for show_data_*() functions
self.labels = ['','','','','','','','']
self.values = ['','','','','','','','']
self.page = False
def show_text(self, text):
self.clear()
self.write(text)
def show_data_20x2(self, toggle=False):
if toggle:
self.page = not self.page
l = self.labels
v = self.values
if not self.page:
# prints labels and values, forcing 5 characters wide
self.set_cursor(0,0)
self.write(f'{l[0]:>5}'[:5])
self.write(f'{v[0]:<5}'[:5])
self.set_cursor(10,0)
self.write(f'{l[1]:>5}'[:5])
self.write(f'{v[1]:<5}'[:5])
self.set_cursor(0,1)
self.write(f'{l[2]:>5}'[:5])
self.write(f'{v[2]:<5}'[:5])
self.set_cursor(10,1)
self.write(f'{l[3]:>5}'[:5])
self.write(f'{v[3]:<5}'[:5])
if self.page:
self.set_cursor(0,0)
self.write(f'{l[4]:>5}'[:5])
self.write(f'{v[4]:<5}'[:5])
self.set_cursor(10,0)
self.write(f'{l[5]:>5}'[:5])
self.write(f'{v[5]:<5}'[:5])
self.set_cursor(0,1)
self.write(f'{l[6]:>5}'[:5])
self.write(f'{v[6]:<5}'[:5])
self.set_cursor(10,1)
self.write(f'{l[7]:>5}'[:5])
self.write(f'{v[7]:<5}'[:5])
def show_data_20x4(self, data_dict=None):
if data_dict:
labels = sorted(data_dict)
self.labels=[]
self.values=[]
for label in labels:
self.labels.append(f'{label}=')
self.values.append(f'{data_dict[label]}')
while len(self.labels) < 8:
self.labels.append('')
self.values.append('')
l = self.labels
v = self.values
# prints labels and values, forcing 5 characters wide
self.set_cursor(0,0)
self.write(f'{l[0]:>5}'[:5])
self.write(f'{v[0]:<5}'[:5])
self.set_cursor(10,0)
self.write(f'{l[1]:>5}'[:5])
self.write(f'{v[1]:<5}'[:5])
self.set_cursor(0,1)
self.write(f'{l[2]:>5}'[:5])
self.write(f'{v[2]:<5}'[:5])
self.set_cursor(10,1)
self.write(f'{l[3]:>5}'[:5])
self.write(f'{v[3]:<5}'[:5])
self.set_cursor(0,2)
self.write(f'{l[4]:>5}'[:5])
self.write(f'{v[4]:<5}'[:5])
self.set_cursor(10,2)
self.write(f'{l[5]:>5}'[:5])
self.write(f'{v[5]:<5}'[:5])
self.set_cursor(0,3)
self.write(f'{l[6]:>5}'[:5])
self.write(f'{v[6]:<5}'[:5])
self.set_cursor(10,3)
self.write(f'{l[7]:>5}'[:5])
self.write(f'{v[7]:<5}'[:5])
def show_data_long(self):
l = self.labels
v = self.values
# prints labels and values, forcing 10 characters wide
self.set_cursor(0,0)
self.write(f'{l[0]:>10}'[:10])
self.write(f'{v[0]:<10}'[:10])
self.set_cursor(0,1)
self.write(f'{l[1]:>10}'[:10])
self.write(f'{v[1]:<10}'[:10])
self.set_cursor(0,2)
self.write(f'{l[2]:>10}'[:10])
self.write(f'{v[2]:<10}'[:10])
self.set_cursor(0,3)
self.write(f'{l[3]:>10}'[:10])
self.write(f'{v[3]:<10}'[:10])