Add Varipass Graph example.

examples/3. Others/3-Inkplate_VariPass_Graphs/3-Inkplate_VariPass_Graphs.ino

@@ -0,0 +1,75 @@
+/*
+   3-Inkplate_VariPass_Graphs example for e-radionica Inkplate6
+   For this example you will need a micro USB cable, Inkplate6, and an available WiFi connection.
+   Select "Inkplate 6(ESP32)" from Tools -> Board menu.
+   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 the API on the VariPass website to download and display
+   a sensor graph on the e-paper display.
+
+   VariPass is a website which allows you to host various online "variables" which you can write to
+   and read from using the VariPass API. This allows you to store sensor logs and later retrieve them
+   for graphing, analysis, etc.
+   This example uses an already public variable as an example. The graph is fed every minute with data
+   from Thorinair's (https://github.com/Thorinair/) geiger counter, so each startup of the Inkplate will
+   display updated values.
+
+   To learn more about VariPass and how you can use it for your own projects, please visit: https://varipass.org/
+   If you want to easily integrate the read/write functionality in your project, use the official library:
+   https://github.com/Thorinair/VariPass-for-ESP8266-ESP32
+
+   Want to learn more about Inkplate? Visit www.inkplate.io
+   Looking to get support? Write on our forums: http://forum.e-radionica.com/en/
+   23 July 2020 by e-radionica.com
+*/
+
+#include "Inkplate.h"               //Include Inkplate library to the sketch
+#include "WiFi.h"                   //Include library for WiFi
+Inkplate display(INKPLATE_1BIT);    //Create an object on Inkplate library and also set library into 1 Bit mode (Monochrome)
+
+const char* ssid     = "YourWiFiSSID"; //Your WiFi SSID
+const char* password = "YourPass";     //Your WiFi password
+
+void setup() {
+  display.begin();        //Init Inkplate library (you should call this function ONLY ONCE)
+  display.clearDisplay(); //Clear frame buffer of display
+  display.display();      //Put clear image on display
+
+  display.print("Connecting to WiFi...");
+  display.partialUpdate();
+
+  //Connect to the WiFi network.
+  WiFi.mode(WIFI_MODE_STA);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    display.print(".");
+    display.partialUpdate();
+  }
+  display.println("\nWiFi OK! Downloading...");
+  display.partialUpdate();
+
+  //Use a HTTP get request to fetch the graph from VariPass.
+  //The API expects a few parameters in the URL to allow it to work.
+  //  action - Should be set to "sgraph" or "graph" in order to generate a compatible image.
+  //  id     - ID of the variable. It is enough to specify just the ID if the variable is public,
+  //           but a "key" parameter should also be specified if not.
+  //  width  - Width of the generated graph, here set to half the Inkplate's width.
+  //  height - Height of the generated graph, here set to half the Inkplate's height.
+  //  eink   - Should be set to true to generate a monochrome 1 bit bitmap better suitable for Inkplate.
+  // For more detailed explanation and more parameters, please visit the docs page: https://varipass.org/docs/ 
+  if(!display.drawBitmapFromWeb("https://api.varipass.org/?action=sgraph&id=kbg3eQfA&width=400&height=300&eink=true", 200, 150)) {
+    //If is something failed (wrong filename or wrong bitmap format), write error message on the screen.
+    //REMEMBER! You can only use Windows Bitmap file with color depth of 1 or 24 bits with no compression! 
+    display.println("Image open error");
+    display.partialUpdate();
+  }
+  display.partialUpdate();
+
+  WiFi.mode(WIFI_OFF);
+}
+
+void loop() {
+  //Nothing...
+}