Add support few cryptocurrencies

Author: Sgoldik

api/api.ino

@@ -6,8 +6,11 @@
 const char* ssid = "TP-Link_408";
 const char* password = "84570550";
 
-#define API_URL "https://pro-api.coinmarketcap.com/v1/cryptocurrency/quotes/latest?id=1,2,3"
-#define API_KEY ""
+const int timeout = 300000; // timeout between next API query
+
+const String API_URL = "https://pro-api.coinmarketcap.com/v1/cryptocurrency/quotes/latest";
+const String CRYPTO = "?slug=bitcoin,ethereum,litecoin";
+#define API_KEY "2831fae4-a23b-4b17-85ee-cce0a4520df2"
 
 void setup() {
   Serial.begin(115200);
@@ -26,7 +29,6 @@ void setup() {
 
 void loop() {
   getData();
-  delay(7650);
 }
 
 void getData() {
@@ -39,7 +41,7 @@ void getData() {
 
     HTTPClient http;
 
-    http.begin(*client, API_URL);
+    http.begin(*client, API_URL + CRYPTO);
     http.addHeader("X-CMC_PRO_API_KEY", API_KEY); 
     int httpCode = http.GET();
 
@@ -52,16 +54,21 @@ void getData() {
       DeserializationError error = deserializeJson(doc, payload);
 
       JsonObject data = doc["data"];
-      JsonObject crypto = data["1"];
-      String ticker = crypto["name"];
 
-      // get price
-      JsonObject quote = crypto["quote"];
-      JsonObject usd = quote["USD"];
-      String price = usd["price"];
-    
-      Serial.print(price);
+      for (JsonPair key : data) {
+        JsonObject crypto = data[key.key().c_str()];
+        String ticker = crypto["name"];
+  
+        // get price
+        JsonObject quote = crypto["quote"];
+        JsonObject usd = quote["USD"];
+        String price = usd["price"];
+      
+        Serial.print(ticker + ",$" + price);
+        delay(timeout / data.size());
+      }
     }
     http.end();
   }
+  delay(timeout);
 }

main/main.ino

@@ -11,9 +11,7 @@ void setup() {
   esp8266.begin(115200);
 
   lcd.init();                     
-  lcd.backlight();
-  lcd.print("Bitcoin");
-  
+  lcd.backlight();  
 }
 
 String strData = "";
@@ -28,15 +26,39 @@ void loop() {
   }
 
   if (recievedFlag) {
-    lcd.setCursor(4, 1);
-    lcd.print(strData);
-    Serial.println(strData);
+    printOnDisplay(strData);
     strData = "";
     recievedFlag = false;
-  }
+  }  
 
 
   if (Serial.available()) {
     esp8266.write(Serial.read());
   }
 }
+
+void printOnDisplay(String string) {
+  // length (with one extra character for the null terminator)
+  int str_len = string.length() + 1; 
+  
+  // prepare the character array (the buffer) 
+  char sz[str_len];
+  
+  // copy it over 
+  string.toCharArray(sz, str_len);
+
+  char *saveptr;
+  char *crypto, *price;
+  
+  crypto = strtok_r(sz, ",", &saveptr);
+  price = strtok_r(NULL, ",", &saveptr);
+  
+  lcd.clear();
+  lcd.setCursor(0, 0);
+  lcd.print(crypto);
+  lcd.setCursor(4, 1); // (16 - 8) / 2
+  lcd.print(price);
+  
+  Serial.println(crypto);
+  Serial.println(price);
+}