The script is very useful if you want to display humidity and temperature without scrolling.
The show_number function accepts the number to be displayed and RGB values of the color to be used.
Here is the full script.
from sense_hat import SenseHat
import time
OFFSET_LEFT = 1
OFFSET_TOP = 2
NUMS =[1,1,1,1,0,1,1,0,1,1,0,1,1,1,1, # 0
0,1,0,0,1,0,0,1,0,0,1,0,0,1,0, # 1
1,1,1,0,0,1,0,1,0,1,0,0,1,1,1, # 2
1,1,1,0,0,1,1,1,1,0,0,1,1,1,1, # 3
1,0,0,1,0,1,1,1,1,0,0,1,0,0,1, # 4
1,1,1,1,0,0,1,1,1,0,0,1,1,1,1, # 5
1,1,1,1,0,0,1,1,1,1,0,1,1,1,1, # 6
1,1,1,0,0,1,0,1,0,1,0,0,1,0,0, # 7
1,1,1,1,0,1,1,1,1,1,0,1,1,1,1, # 8
1,1,1,1,0,1,1,1,1,0,0,1,0,0,1] # 9
# Displays a single digit (0-9)
def show_digit(val, xd, yd, r, g, b):
offset = val * 15
for p in range(offset, offset + 15):
xt = p % 3
yt = (p-offset) // 3
sense.set_pixel(xt+xd, yt+yd, r*NUMS[p], g*NUMS[p], b*NUMS[p])
# Displays a two-digits positive number (0-99)
def show_number(val, r, g, b):
abs_val = abs(val)
tens = abs_val // 10
units = abs_val % 10
if (abs_val > 9): show_digit(tens, OFFSET_LEFT, OFFSET_TOP, r, g, b)
show_digit(units, OFFSET_LEFT+4, OFFSET_TOP, r, g, b)
################################################################################
# MAIN
sense = SenseHat()
sense.clear()
for i in range(0, 100):
show_number(i, 200, 0, 60)
time.sleep(0.2)
sense.clear()
This is amazing! Thank you so much for creating this. I was spinning my wheels for a little while trying to come up with my own solution but this looks great!
ReplyDeleteThanks again!
Dwayne
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ReplyDeleteNew to the rpi and python. I'm at a loss as to how this is writing the numbers via the loop in show_digit and how NUMS is used. Any chance of some pseudocode to help in understanding?
ReplyDeleteDisplays digits in 3x5 grid
DeleteOFFSET_LEFT and OFF_SET_TOP provide padding to centre on 8x8 grid
Each digit 0-9 is represented in NUM list as 15 bits - a stack of five 3 bit sets
Zero is 111, 101, 101, 101, 111
Five is 111, 100, 111 001, 111
If you stack e.g five and replace the 0s with spaces, you get
111
1
111
1
111
def show_digit is responsible for drawing a single digit
- offset finds where this digit starts in NUMS list
- the for loop provides an index into NUMs for each of the 15 required bits
- xt/yt find the x/y position to plot this digit
- set_pixel plots the digit at the offsetted x/y position
- the r/g/b*NUMS[p] trick results in a zero or the selected colour
def_show_number is responsible for showing both digits
- the first digit is plotted according to OFFSET_LEFT, OFFSET_RIGHT
- the second digit is plotted 4 points to the right of that
the python scrip just scrolls from 1 to 100 and doesn't seem to show the actual temperature??
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