Online Bitcoin services
Before starting with online Bitcoin services, we need to know how to actually get the current price (in US dollars) of Bitcoin.
On the Web, it's quite easy to get the price or the historical value of Bitcoin. For example, a good website to look at is Coindesk:
http://www.coindesk.com/price/
On this website, you have access to the current price of Bitcoin, and also nice graphs showing the historical value of Bitcoin:
That's nice, but it is only accessible via the website and it's too complicated anyway for our little ESP8266 board.
A better solution is simply to have what is called a Bitcoin ticker that just displays the real-time value of Bitcoin. A good example of such a ticker can be found at the following URL:
You will see the current value of Bitcoin, which you can display in multiple currencies:
That's what we want to build for our project: a simple Bitcoin ticker that displays the current value of Bitcoin in USD.
However, we can't access...