Created
November 4, 2018 09:25
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Raspberry Pi Sense Hat Fireworks
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| # This example gist makes fireworks appear on the Raspberry Pi Sense Hat. This could be adapted for other LED based Raspberry Pi Hats. | |
| from sense_hat import SenseHat | |
| from time import sleep | |
| from random import randint | |
| import threading | |
| DECAY = 0.7 # Colour decay of firework head. | |
| SPEED = 0.1 # Speed of firework explosion. | |
| DISPLAY_SPEED = 0.6 # Speed of firework launches. | |
| SIZE = 4 # Size of firework head, should be between 1 and 7. | |
| sense = SenseHat() | |
| sense.clear() | |
| def firework_head(i, j, r, g, b): | |
| # Make the firework explody bit. | |
| # Expand 4 pixels out by SIZE across the sense hat, using DECAY to fade the firework head. | |
| for x in range(0, SIZE): | |
| if(i-x >= 0): sense.set_pixel(i-x, j, r, g, b) | |
| if(j-x >= 0): sense.set_pixel(i, j-x, r, g, b) | |
| if(i+x <= 7): sense.set_pixel(i+x, j, r, g, b) | |
| if(j+x <= 7): sense.set_pixel(i, j+x, r, g, b) | |
| sleep(SPEED) | |
| # Tidy the head at each step. | |
| tidy_head(i, j, x) | |
| # Fade the head colour if requested. | |
| r = int(r * DECAY) | |
| g = int(g * DECAY) | |
| b = int(b * DECAY) | |
| def firework_tail(i, j, r, g, b): | |
| # Make the firework fiery tail. | |
| for x in range(7, j, -1): | |
| sense.set_pixel(i, x, r, g, b) | |
| sleep(SPEED) | |
| # Tidy the tail once the tail has gone all the way. | |
| tidy_tail(i, j) | |
| def tidy_tail(i, j): | |
| # Tidy up the tail. | |
| for x in range(7, j, -1): | |
| sense.set_pixel(i, x, 0, 0, 0) | |
| def tidy_head(i, j, x): | |
| # Tidy the head of the firework. | |
| if(i-x >= 0): sense.set_pixel(i-x, j, 0, 0, 0) | |
| if(j-x >= 0): sense.set_pixel(i, j-x, 0, 0, 0) | |
| if(i+x <= 7): sense.set_pixel(i+x, j, 0, 0, 0) | |
| if(j+x <= 7): sense.set_pixel(i, j+x, 0, 0, 0) | |
| def firework(): | |
| # Make a firework at a random point on the sense hat. | |
| i = randint(0, 7) | |
| j = randint(0, 4) # Not 7 so our fireworks will always be at least halfway. | |
| # Pick a random brightish colour for the firework. Also this allows for colour decay if using DECAY. | |
| r = randint(100, 255) | |
| g = randint(100, 255) | |
| b = randint(100, 255) | |
| # Tails will be orange, because that's what colour they are. | |
| firework_tail(i, j, 255, 100, 0) | |
| firework_head(i, j, r, g, b) | |
| try: | |
| while True: | |
| # Set up threading of firework so that multiple fireworks can be displayed at the same time. | |
| thread = threading.Thread(target=firework) | |
| thread.start() | |
| # Speed of firework display. | |
| sleep(DISPLAY_SPEED) | |
| except KeyboardInterrupt: | |
| # Clear the sense hat when the display is over. | |
| sense.clear() |
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