debugging, comments etc.

examples/3. Projects/2-Crypto_tracker_example/2-Crypto_tracker_example.ino

@@ -5,12 +5,14 @@
    Don't have "Inkplate 6(ESP32)" option? Follow our tutorial and add it:
    https://e-radionica.com/en/blog/add-inkplate-6-to-arduino-ide/
 
-   This example will show you how you can use Inkplate 6 to display API data,
-   e.g. coingecko api
+   This example will show you how you can use Inkplate 6 to display API data.
+   Here we use Coingecko API to get latest cryptocurrency prices and display
+   them on the Inkplate screen. If you wish to change the currecny, you can
+   edit it below. 
 
    IMPORTANT:
    Make sure to change your timezone and wifi credentials below
-   Also have ArduinoJSON installed in your Arduino libraries
+   Also have ArduinoJSON installed in your Arduino libraries, download here: https://arduinojson.org/
 
    Want to learn more about Inkplate? Visit www.inkplate.io
    Looking to get support? Write on our forums: http://forum.e-radionica.com/en/
@@ -19,7 +21,7 @@
 
 // ---------- CHANGE HERE  -------------:
 
-// Adjust your time zone
+// Adjust your time zone, 2 means UTC+2
 int timeZone = 2;
 
 // Put in your ssid and password
@@ -31,6 +33,9 @@ char *pass = "";
 char *currency = "bitcoin";
 char *currencyAbbr = "BTC";
 
+// You can find your currency id here:
+// https://api.coingecko.com/api/v3/coins
+
 // ----------------------------------
 
 // Include Inkplate library to the sketch
@@ -47,10 +52,10 @@ char *currencyAbbr = "BTC";
 // create object with all networking functions
 Network network;
 
-// create
+// create display object
 Inkplate display(INKPLATE_3BIT);
 
-// Delay between API calls
+// Delay between API calls in miliseconds
 #define DELAY_MS 5000
 
 // Variable for counting partial refreshes
@@ -60,7 +65,7 @@ long refreshes = 0;
 const int fullRefresh = 20;
 
 // Used for storing raw price values
-float data[64];
+double data[64];
 
 // Used to simplify UI design
 struct textElement
@@ -106,9 +111,9 @@ textElement elements[] = {
     {190, 185, &Roboto_Light_40, fromToDate, 0},
     {570, 140, &Roboto_Light_40, "Current price:", 0},
     {790, 190, &Roboto_Light_40, current, 1},
-    {630, 275, &Roboto_Light_40, "Minimum", 0},
+    {630, 275, &Roboto_Light_40, "Minimum:", 0},
     {790, 320, &Roboto_Light_40, minimum, 1},
-    {625, 420, &Roboto_Light_40, "Maximum", 0},
+    {625, 420, &Roboto_Light_40, "Maximum:", 0},
     {790, 466, &Roboto_Light_40, maximum, 1},
 
     {18, 570, &Roboto_Light_36, dates, 0},
@@ -136,8 +141,8 @@ void drawGraph()
     int textMargin = 68;
 
     // Set min to a very high value, and max to very low, so that any real world data changes it
-    float minData = 1e9F;
-    float maxData = -1e9F;
+    double minData = 1e9F;
+    double maxData = -1e9F;
 
     // Find min and max in data
     for (int i = 0; i < 31; ++i)
@@ -146,7 +151,9 @@ void drawGraph()
         maxData = max(maxData, data[i]);
     }
 
-    // Copy current, min and max data to har arrays to be displayed
+    double span = max(0.3D, (double)abs(maxData - minData));
+
+    // Copy current, min and max data to char arrays to be displayed
     dtostrf(data[30], 8, 2, current);
     strcat(current, "$");
     dtostrf(minData, 8, 2, minimum);
@@ -159,7 +166,7 @@ void drawGraph()
 
     for (int i = 0; i < 4; ++i)
     {
-        dtostrf(minData + (float)i / 4 * (maxData - minData), 5, 0, temp);
+        dtostrf(minData + (double)i / 4 * span, 5, (maxData < 10.0D ? 3 : 0), temp);
         strncpy(prices + 16 * (3 - i), temp, 16);
     }
 
@@ -167,11 +174,24 @@ void drawGraph()
     int day;
     sscanf(date + 3, "%d", &day);
 
+    // Find current month
+    int month = 0;
+    for (int i = 0; i < 12; ++i)
+    {
+        if (strncmp(months[i], date, 3) == 0)
+            month = ((i + 2) % 12 ? i + 2 : 12);
+    }
+
     // Find days to display underneath the graph
     for (int i = 0; i < 5; ++i)
     {
         itoa(((day - i * 7) % 31 + 31) % 31, temp, 10);
+        itoa(month - ((day - i * 7) <= 0), temp + 32, 10);
+
         strncpy(dates + 8 * (4 - i), temp, 8);
+        strcat(dates + 8 * (4 - i), ".");
+        strcat(dates + 8 * (4 - i), temp + 32);
+        strcat(dates + 8 * (4 - i), ".");
     }
 
     // Used for drawing lines
@@ -183,20 +203,20 @@ void drawGraph()
     {
         // Calculate heights and current x value for a data point
         int tx = x1 + i * (x2 - x1 - textMargin) / 31;
-        float v = data[i];
-        int h = (int)((float)(v - minData) * (float)abs(y1 - y2) / (float)abs(maxData - minData));
+        double v = data[i];
+        int h = (int)((double)(v - minData) * (double)abs(y1 - y2) / span);
         int ty = y1 - h;
 
         // If i is not 0, hence prev x and y exsist so draw gradients under them
         if (i)
         {
             // Rise over run for one pixel
-            float dy = (float)(ty - prev_y) / (float)((x2 - x1 - textMargin) / 31);
+            double dy = (double)(ty - prev_y) / (double)((x2 - x1 - textMargin) / 31);
 
             // Draw a gradient line from every pixel to bottom line in graph line
             for (int j = 0; j < (x2 - x1 - textMargin) / 31 + 1; ++j)
                 display.drawGradientLine(prev_x + j,
-                                         (int)round((float)prev_y + dy * (float)j),
+                                         (int)round((double)prev_y + dy * (double)j),
                                          prev_x + j,
                                          y1, 3, 7);
         }
@@ -211,8 +231,8 @@ void drawGraph()
     {
         // Calculate heights and current x value for a data point
         int tx = x1 + i * (x2 - x1 - textMargin) / 31;
-        float v = data[i];
-        int h = (int)((float)(v - minData) * (float)abs(y1 - y2) / (float)abs(maxData - minData));
+        double v = data[i];
+        int h = (int)((double)(v - minData) * (double)abs(y1 - y2) / span);
         int ty = y1 - h;
 
         // If i is not 0, hence prev x and y exsist so draw lines
@@ -255,7 +275,7 @@ void drawAll()
         for (int i = 0; i < 12; ++i)
         {
             if (strncmp(months[i], date, 3) == 0)
-                sprintf(fromToDate, "%d.%d to %d.%d", ((i + 1) % 12 ? i + 1 : 12), day, ((i + 2) % 12 ? i + 2 : 12), day);
+                sprintf(fromToDate, "%d.%d. to %d.%d.", day, ((i + 1) % 12 ? i + 1 : 12), day, ((i + 2) % 12 ? i + 2 : 12));
         }
 
         // Draw graph
@@ -329,14 +349,17 @@ void setup()
 
     // Initial display settings
     display.begin();
-    display.clearDisplay();
     display.clean();
+    display.clearDisplay();
     display.setTextWrap(false);
+    display.setTextColor(0, 7);
 
     // Welcome screen
-    display.setCursor(50, 290);
-    display.setTextSize(3);
-    display.print(F("Welcome to Inkplate 6 btc/eth tracker example!"));
+    display.setCursor(70, 230);
+    display.setTextSize(2);
+    display.println(F("Welcome to Inkplate 6 btc/eth tracker example!"));
+    display.setCursor(70, 250);
+    display.println(F("Connecting to WiFi..."));
     display.display();
 
     delay(5000);
@@ -364,4 +387,4 @@ void loop()
 
     // Increment refresh count
     ++refreshes;
-}
+}

examples/3. Projects/2-Crypto_tracker_example/Network.cpp

@@ -5,6 +5,8 @@
 #include <HTTPClient.h>
 #include <WiFiClientSecure.h>
 
+#include "Inkplate.h"
+
 // Must be installed for this example to work
 #include <ArduinoJson.h>
 
@@ -13,6 +15,8 @@ extern char *ssid;
 extern char *pass;
 extern char *currency;
 
+extern Inkplate display;
+
 // WiFiMulti object declaration
 WiFiMulti WiFiMulti;
 
@@ -61,7 +65,7 @@ void Network::getTime(char *timeStr)
     timeStr[8] = hr % 10 + '0';
 }
 
-bool Network::getData(float *data)
+bool Network::getData(double *data)
 {
     bool f = 0;
 
@@ -111,11 +115,23 @@ bool Network::getData(float *data)
             // Save our data to data pointer from main file
             for (int i = 0; i < 31; ++i)
             {
-                data[i] = doc["prices"][92 - 31 + i][1].as<float>();
+                data[i] = doc["prices"][92 - 31 + i][1].as<double>();
                 //Serial.println(data[i]);
             }
+            f = 0;
         }
     }
+    else if (httpCode == 404)
+    {
+        // Coin id not found
+        display.clearDisplay();
+        display.setCursor(50, 230);
+        display.setTextSize(2);
+        display.println(F("Your entered coin does not exsist!"));
+        display.display();
+        while (1)
+            ;
+    }
     else
     {
         f = 1;

examples/3. Projects/2-Crypto_tracker_example/Network.h

@@ -22,7 +22,7 @@ public:
     // Functions we can access in main file
     void begin();
     void getTime(char *timeStr);
-    bool getData(float *data);
+    bool getData(double *data);
 
 private:
     // Functions called from within our class