{"id":362,"date":"2017-06-08T20:31:34","date_gmt":"2017-06-08T20:31:34","guid":{"rendered":"http:\/\/warmcat.uk\/?p=362"},"modified":"2020-06-06T02:14:08","modified_gmt":"2020-06-06T02:14:08","slug":"raspberry-pi-stock-ticker","status":"publish","type":"post","link":"https:\/\/warmcat.uk\/?p=362","title":{"rendered":"Raspberry Pi Stock Ticker"},"content":{"rendered":"\n

UPDATE: Yahoo\u2019s ystockquote is no longer available. However one person emailed me advising that it\u2019s still possible to obtain Yahoo\u2019s stock by parsing data with the python package \u201cBeautifulSoup\u201d.<\/p>\n\n\n\n

I love tinkering with displays, as you can see with my post about the DLR2416<\/a>, so I purchased Adafruit\u2019s 2.2\u2033 PiTFT plug-in display from www.pimoroni.com<\/a> to try out.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

This display works great with my Raspberry Pi B+ or A+. To get things started I followed the tutorial\/guide on Adafruit\u2019s website here<\/a>. I\u2019ll not go into detail regarding getting the PiTFT working with your Pi as Adafruit covers it very well.<\/p>\n\n\n\n

For network\/internet connection I used a Pi-compatable USB wifi dongle, again I\u2019ll not go into detail with installing that, as it differs a great deal depending on what make\/model dongle you get your hands on. There\u2019s tons of stuff on the internet discussing wifi dongles with the Raspberry Pi. Also you could always just use an ethernet cable.<\/p>\n\n\n\n

Once you get your PiTFT display working with the example code from Adafruit, there\u2019s only a few steps to take to turn your new display into a stock ticker.<\/p>\n\n\n\n

Install pygame. It\u2019s usually installed as standard with Raspbian. You can check by running Python at the command line, then the following at the interactive shell:
>>> import pygame<\/code>
If nothing happens then you already have pygame installed, else you\u2019ll get an error like:
ImportError: No module named pygame<\/code>
If it isn\u2019t installed, then quit Python and do a:
$ sudo apt-get install python-pygame<\/code><\/p>\n\n\n\n

Next we need to install Yahoo\u2019s API \u201cystockquote\u201d, at the console:
$ pip install ystockquote<\/code><\/p>\n\n\n\n

There is plenty of example code here<\/a> on Python\u2019s website if you want to have a mess about, or see how it can be used.<\/p>\n\n\n\n

I used a font from www.dafont.com called \u201cCodeNewRoman b\u201d, you can download that here<\/a>. Copy the font file into the same place as the Python script.<\/p>\n\n\n\n

Now it\u2019s just a case of saving and running the Python script below:
$ python PiStockTFT.py<\/code><\/p>\n\n\n\n

#!\/usr\/bin\/env python\nimport os\nimport time\nimport socket\nimport pygame\nimport ystockquote\ndef main():\n    #Colours\n    WHITE = (255,255,255)\n    GREY = (240,240,240)\n    BLACK = (0,0,0)\n    BLUE = (0,145,255)\n    RED = (255,0,0)\n    GREEN = (0,255,0)\n    YELLOW = (255,255,0)\n    tickersymbols = ['LWRF.L','BTG.L','AAPL','AUE.L']\n    print(\"\\n============================================\")\n    print(\"= StockPi stock ticker from www.warmcat.uk =\")\n    print(\"============================================\\n\")\n    print(\"Initialising TFT...\")\n    os.putenv('SDL_FBDEV', '\/dev\/fb1')\n    pygame.init()\n    pygame.mouse.set_visible(False)\n    lcd = pygame.display.set_mode((320,240))\n    lcd.fill(BLACK)\n    pygame.display.update()\n    myfont = pygame.font.Font(\"CodeNewRoman_b.otf\", 32)\n    myfont2 = pygame.font.Font(\"CodeNewRoman_b.otf\", 24)\n    keep_running = True\n    try:\n        textToPrint = myfont.render(\"Fetching data...\", 0, WHITE)\n        lcd.blit(textToPrint, (10,210))\n        pygame.display.update()\n        while keep_running:\n            x = 0\n            pygame.draw.circle(lcd, YELLOW, (307,12), 6, 0)\n            pygame.display.update()\n            print(\"Fetching data...\")\n            for tickerSymbol in tickersymbols:\n                try:\n                    allInfo = ystockquote.get_all(tickerSymbol)\n                except:\n                    textToPrint = myfont.render(\"Error...\", 0, WHITE)\n                    lcd.blit(textToPrint, (10,210))\n                    pygame.display.update()\n                    print(\"Connection Error, waiting 20 seconds.\")\n                    time.sleep(20)\n                    pass\n                price = float(allInfo[\"price\"])\n                change = float(allInfo[\"change\"])\n                percent = change\/(change + price)*100\n                peratio = allInfo[\"price_earnings_ratio\"]\n                if change == 0:\n                    ourColour = GREY\n                elif change > 0:\n                    ourColour = GREEN\n                else:\n                    ourColour = RED\n                print tickerSymbol + \"\\t= %3.2f (%+0.2f, %+0.2f%%) P\/E %s\" % (price, change, percent, peratio)\n                stockPrice = (\"{:>6.2f}\".format(price))\n                stockChanges = (\"({:>+5.2f}, {:>+5.2f}%)\".format(change, percent))\n                if x == 0:\n                    lcd.fill(BLACK)\n                textToPrint = myfont.render(tickerSymbol, 0, WHITE)\n                lcd.blit(textToPrint, (30,7+x))\n                textToPrint = myfont.render(stockPrice, 0, ourColour)\n                lcd.blit(textToPrint, (160,5+x))\n                textToPrint = myfont2.render(stockChanges, 0, ourColour)\n                lcd.blit(textToPrint, (62,32+x))\n                x=x+58;\n            pygame.display.update()\n            print(\"Done.\")\n            time.sleep(60) #seconds (so every 1 min)\n    except KeyboardInterrupt:\n        print(\"\\nQuitting...\")\n        keep_running = False\n    else:\n        print(\"Oh my god, it's all gone to shit!\")\n        lcd.fill(BLACK)\n        textToPrint = myfont.render(\"ERROR...\", 0, WHITE)\n        lcd.blit(textToPrint, (10,210))\n        pygame.display.update()\n        raise\nif __name__ == '__main__': main()<\/code><\/pre>\n\n\n\n
Here’s how it looks:<\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
I also used the same type of display for a train map project utilising the National Rail API, but alas did not document it:<\/p>\n\n\n\n