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April 2, 2016 20:03
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Display the price of Bitcoin with a Photon.
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| { | |
| "eventName": "bitcoin", | |
| "url": "https://api.bitcoinaverage.com/ticker/global/USD/", | |
| "requestType": "GET", | |
| "mydevices": true | |
| } |
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| /* | |
| Bitcoin Monitor: | |
| This sketch shows the current Bitcoin price | |
| on an LCD. | |
| The circuit: | |
| * LCD RS pin to digital pin D0 | |
| * LCD EN pin to digital pin D1 | |
| * LCD D4 pin to digital pin D2 | |
| * LCD D5 pin to digital pin D3 | |
| * LCD D6 pin to digital pin D4 | |
| * LCD D7 pin to digital pin D5 | |
| * 10K resistor: | |
| * ends to +5V and ground | |
| * wiper to LCD VO pin (pin 3) | |
| * connect R/W (pin 5) to ground | |
| */ | |
| #include "LiquidCrystal/LiquidCrystal.h" | |
| LiquidCrystal lcd(D0, D1, D2, D3, D4, D5); | |
| void setup() | |
| { | |
| lcd.begin(16,2); // set up the LCD's number of columns and rows: | |
| lcd.print("Bitcoin Price:"); // Print a message to the LCD. | |
| Particle.publish("bitcoin"); // Trigger bitcoin webhook | |
| Particle.subscribe("hook-response/bitcoin/0", bitcoinHandler, MY_DEVICES); // Subscribe to the webhook response | |
| Serial.begin(9600); // Begin serial | |
| } | |
| void loop() | |
| { | |
| if (millis()/1000 % 10 == 0) // Every ten seconds | |
| { | |
| Particle.publish("bitcoin"); // Trigger bitcoin webhook | |
| } | |
| } | |
| void bitcoinHandler(const char *event, const char *data) // This is called when the Photon recives the webhook data. | |
| { | |
| Serial.println(data); // Print the data to serial for debugging | |
| String ask = String(getAskPrice(data)); // Get the ask price of Bitcoin | |
| Serial.println(ask); // Print it to serial | |
| lcd.setCursor(0, 1); // Set the cursor to the second line | |
| lcd.print(" "); // Clear the second line | |
| lcd.setCursor(0,1); // Reset cursor | |
| lcd.print(ask); // Print the price of bitcoin | |
| lcd.print(" USD"); // Print "USD" after | |
| } | |
| String getAskPrice(String data) // This function gets the value in the "ask:" part of the JSON. | |
| { | |
| int kLocation = data.indexOf("k"); // Find where the "k" of ask appears | |
| int commaLocation = data.indexOf(",", kLocation); // Find where the comma after the value appears | |
| String value = data.substring(kLocation +4, commaLocation); // The value is from 4 characters after where "k" is and right before where the comma is. | |
| return value; // Return the ask price of Bitcoin | |
| } |
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Bitcoin Price Monitor:
To make this project you need a standard 16x2 LCD display, a breadboard, a Particle Photon and a Potentiometer.
1.) Wire up the LCD to the Photon like so:
2.) Flash the
LCD-Bitcoin-Monitor.inofile to your Photon by copying and pasting it into Particle Build and clicking on the flash icon.3.) Upload the
bitcoin.jsonfile to your Particle account:$ particle webhook create bitcoin.json4.) Click reset on your Photon and enjoy your bitcoin price monitor!
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