I guess many of us find lighting up loads of LEDs to be rather interesting, so when I saw this group of 4 Matrix displays for sale cheaply, I had to pounce and find a use for them later.
There are a number of methods described for running them with the Raspberry Pi but I stumbled on an excellent library which does all of the hard work. The documentation is comprehensive and the examples really show what is possible.
I started out with just an 8×8 display originally, not trusting that I’d have any success with a larger module, but soon I got bored and upgraded. Woah… this thing works well, especially once the correct rotation had been added.
#!/usr/bin/env python import time from random import randrange import max7219.led as led from max7219.font import proportional, SINCLAIR_FONT, TINY_FONT, CP437_FONT import feedparser python_wiki_rss_url = "http://open.live.bbc.co.uk/weather/feeds/en/2649808/3dayforecast.rss" # create matrix device device = led.matrix(cascaded=4) device.orientation(90) print("Created device") while True: print("Getting feed") feed = feedparser.parse( python_wiki_rss_url) for repeats in range(10): print(repeats) for items in feed["items"]: msg = items["title"] msg = msg[0:msg.find(",")] print(msg) device.show_message(msg, font=proportional(SINCLAIR_FONT)) time.sleep(1) msg = time.asctime() msg= time.strftime("%H:%M") print(msg) device.show_message(msg, font=proportional(SINCLAIR_FONT)) time.sleep(10)
I quickly looked up reading RSS feeds as well as strftime for python, and in a short period of time the program above shows a clock for 10 seconds and then parts of the 3 day forecast.