Cryptocurrency tracker with the GIGA Display Shield

1#include <WiFi.h>
2#include <SPI.h>
3#include <ArduinoHttpClient.h>
4#include <ArduinoJson.h>
5#include "Arduino_GigaDisplay_GFX.h"
6
7// Define colors for use with the display
8#define BLACK 0x0000
9#define GREEN 0x07e0
10#define RED 0xb000
11#define WHITE 0xffff
12
13// Replace with your network credentials
14const char* SSID = " ";
15const char* PASS = " ";
16
17int status = WL_IDLE_STATUS;
18
19// Create the display object that will be used for display functions
20GigaDisplay_GFX display;
21
22// Variables to keep track of previous crypto prices
23float lastUSDPrice = 0;
24float lastEURPrice = 0;
25float lastETHPrice = 0;
26
27// Variables to keep track of the cryptos value difference between each update
28float usdDiff = 0;
29float eurDiff = 0;
30float ethDiff = 0;
31
32void setup() {
33  // Initialize serial communication
34  Serial.begin(9600);
35  delay(3000);
36  display.begin();  //init display library
37  display.setRotation(1); // rotates the display to horizontal
38
39  // Connect to Wi-Fi
40  display.fillScreen(BLACK); // Makes the screen blank
41  display.setCursor(10, 10);  //x,y
42  display.setTextSize(5);     //adjust text size
43  display.print("Connecting to Wi-Fi....");
44
45  while (status != WL_CONNECTED) {
46    status = WiFi.begin(SSID, PASS);
47
48    // wait 10 seconds for connection:
49    delay(10000);
50  }
51
52  display.fillScreen(BLACK); // Makes the screen blank
53  display.setCursor(10, 10); //x,y
54  display.print("Connected to Wi-Fi!");
55
56  // This function makes the API call and displays the results
57  displayCryptoPrice();
58}
59
60void loop() {
61  // Sets the waiting time between the API calls. This delay function will wait for 5 minutes
62  // before it will use the API call to update the currency values. If you want a shorter interval change this number
63  delay(300000);
64  displayCryptoPrice();
65}
66
67void displayCryptoPrice() {
68  if (WiFi.status() == WL_CONNECTED) {
69    String usdDiffText, eurDiffText, ethDiffText; // Variables that keep track of the value difference
70    int httpPort = 443; // Port for connecting with HTTPS
71    char serverAddress[] = "api.coinbase.com";  // Server to connect to
72    WiFiSSLClient wifi;
73    HttpClient client = HttpClient(wifi, serverAddress, httpPort);
74    client.get("/v2/exchange-rates?currency=BTC"); // API call
75
76    String result = client.responseBody(); // Collects the API response
77
78    if (result > 0) {
79      DynamicJsonDocument doc(32000);
80      deserializeJson(doc, result);
81      
82      //Sorts the information from the API call
83      String currency = doc["data"]["currency"];
84      float usdPrice = doc["data"]["rates"]["USD"];
85      float eurPrice = doc["data"]["rates"]["EUR"];
86      float ethPrice = doc["data"]["rates"]["ETH"];
87
88      // Display the selected crypto currency on the display, which is gotten from the API call.
89      // If you change the call to track another crypto this will update
90      display.fillScreen(BLACK);
91      display.setCursor(10, 10);
92      display.setTextSize(5);
93      display.print(currency + " Prices");
94
95      /* Shows the BTC price in USD */
96      // Changes tect color depending on the updated value
97      if(lastUSDPrice < usdPrice){
98        display.setTextColor(GREEN); 
99        usdDiff = usdPrice - lastUSDPrice;
100        usdDiffText = "(+" + String(usdDiff) + ")";
101      }
102      if(lastUSDPrice > usdPrice){
103        display.setTextColor(RED);
104        usdDiff = usdPrice - lastUSDPrice;
105        usdDiffText = ("(" + String(usdDiff) + ")");
106      }
107      if(lastUSDPrice == 0){
108        display.setTextColor(WHITE);
109        usdDiffText = " ";
110        }
111      // Updated last value for future comparison
112      lastUSDPrice = usdPrice;
113      // Puts the info on the display 
114      display.setTextSize(5);
115      display.setCursor(10, 100);
116      display.print("USD: ");
117      display.setCursor(130, 100);
118      display.print(usdPrice, 2);
119      // Puts the value difference on the display
120      display.setTextSize(2);
121      display.setCursor(440, 100);
122      display.print(usdDiffText);
123
124      /* Shows the BTC price in EUR */
125      // Changes tect color depending on the updated value
126      if(lastEURPrice < eurPrice){
127        display.setTextColor(GREEN); 
128        eurDiff = eurPrice - lastEURPrice;
129        eurDiffText = ("(+" + String(eurDiff) + ")");
130      }
131      if(lastEURPrice > eurPrice){
132        display.setTextColor(RED); 
133        eurDiff = eurPrice - lastEURPrice;
134        eurDiffText = ("(" + String(eurDiff) + ")");
135      }
136      if(lastEURPrice == 0){
137        display.setTextColor(WHITE);
138        eurDiffText = " ";
139        }
140      // Updated last value for future comparison
141      lastEURPrice = eurPrice;
142      // Puts the info on the display
143      display.setTextSize(5);
144      display.setCursor(10, 190);
145      display.print("EUR: ");
146      display.setCursor(130, 190);
147      display.print(eurPrice, 2);
148      // Puts the value difference on the display
149      display.setTextSize(2);
150      display.setCursor(440, 190);
151      display.print(eurDiffText);
152
153      // /* Shows the BTC price in ETH */
154      // Changes tect color depending on the updated value
155      if(lastETHPrice < ethPrice){
156        display.setTextColor(GREEN);
157        ethDiff = ethPrice - lastETHPrice;
158        ethDiffText = ("(+" + String(ethDiff) + ")");
159      }
160      if(lastETHPrice > ethPrice){
161        display.setTextColor(RED);
162        ethDiff = ethPrice - lastETHPrice;
163        ethDiffText = ("(" + String(ethDiff) + ")");
164      }
165      if(lastETHPrice == 0){
166        display.setTextColor(WHITE);
167        ethDiffText = " ";
168        }
169      // Updated last value for future comparison
170      lastETHPrice = ethPrice;
171      // Puts the info on the display
172      display.setTextSize(5);
173      display.setCursor(10, 280);
174      display.print("ETH: ");
175      display.setCursor(130, 280);
176      display.print(ethPrice, 2);
177      // Puts the value difference on the display
178      display.setTextSize(2);
179      display.setCursor(440, 280);
180      display.print(ethDiffText);
181
182      // Adding additional information
183      display.setTextColor(WHITE);
184      display.setTextSize(4);
185      display.setCursor(130, 380);
186      display.print("Updates every 5 minutes");
187    } else {
188      // Error checking the HTTPS request
189      display.fillScreen(BLACK);
190      display.setCursor(10, 10);  //x,y
191      display.print("Error on HTTP request");
192    }
193    client.stop();  // End the request
194  }
195}