Arduino Bitcoin Ticker

MicroController's Class Project

Arduino bitcoin ticker - get's bitcoin's price from various exchanges and outputs it to the 16x2 display shield. Author/s: Wale Morenigbade
How it works.
Modes/Exchanges/Pairs:
There are five 'modes'
Mode 0 - Pulls the price from Kraken.com on the BTC/EUR Pair : https://api.kraken.com/0/public/Ticker?pair=XXBTZEUR
Mode 1 - Pulls the price from Kraken.com on the BTC/USD Pair : https://api.kraken.com/0/public/Ticker?pair=XXBTZUSD
Mode 2 - Pulls the price from Bitstamp.com on the BTC/EUR Pair : https://www.bitstamp.net/api/v2/ticker/btceur/
Mode 3 - Pulls the price from Bitstamp.com on the BTC/USD Pair : https://www.bitstamp.net/api/v2/ticker/btcusd/
Mode 4 - Pulls the price from Bitbay.net on the BTC/PLN Pair : https://bitbay.net/API/Public/BTCPLN/ticker.json

I'm using my server as a conduit to poll these apis : It simplifies the data into a simple array of [2] elements: Pros: Less RAM usage on the arduino.
I've attached the .php file running on my server along with this file.