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libraries/Blynk/examples/More/SetProperty/SetProperty_SingleValue/SetProperty_SingleValue.ino

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+/*************************************************************
+  Blynk is a platform with iOS and Android apps to control
+  ESP32, Arduino, Raspberry Pi and the likes over the Internet.
+  You can easily build mobile and web interfaces for any
+  projects by simply dragging and dropping widgets.
+
+    Downloads, docs, tutorials: https://www.blynk.io
+    Sketch generator:           https://examples.blynk.cc
+    Blynk community:            https://community.blynk.cc
+    Follow us:                  https://www.fb.com/blynkapp
+                                https://twitter.com/blynk_app
+
+  Blynk library is licensed under MIT license
+  This example code is in public domain.
+
+ *************************************************************
+
+  You can set predefined properties (color, label, ...) of any widget.
+  Read more: https://docs.blynk.io/en/blynk.edgent-firmware-api/widget-properties
+
+  App dashboard setup:
+    Gauge widget (0...100) on V0
+    Slider widget (0...100) on V1
+ *************************************************************/
+
+/* Comment this out to disable prints and save space */
+#define BLYNK_PRINT Serial
+
+/* Fill in information from Blynk Device Info here */
+//#define BLYNK_TEMPLATE_ID           "TMPxxxxxx"
+//#define BLYNK_TEMPLATE_NAME         "Device"
+//#define BLYNK_AUTH_TOKEN            "YourAuthToken"
+
+
+#include <SPI.h>
+#include <Ethernet.h>
+#include <BlynkSimpleEthernet.h>
+
+#define BLYNK_GREEN     "#23C48E"
+#define BLYNK_BLUE      "#04C0F8"
+#define BLYNK_YELLOW    "#ED9D00"
+#define BLYNK_RED       "#D3435C"
+#define BLYNK_DARK_BLUE "#5F7CD8"
+
+String gaugeColor;
+
+BLYNK_WRITE(V1) {
+  int gaugeValue = param.asInt();
+
+  String newColor;
+  if (gaugeValue > 80) {
+    newColor = BLYNK_RED;
+  } else if (gaugeValue > 50) {
+    newColor = BLYNK_YELLOW;
+  } else {
+    newColor = BLYNK_GREEN;
+  }
+
+  // Send only if changed
+  if (newColor != gaugeColor) {
+    gaugeColor = newColor;
+    Blynk.setProperty(V0, "color", gaugeColor);
+  }
+
+  Blynk.virtualWrite(V0, gaugeValue);
+}
+
+void setup()
+{
+  // Debug console
+  Serial.begin(9600);
+
+  Blynk.begin(BLYNK_AUTH_TOKEN);
+}
+
+void loop()
+{
+  Blynk.run();
+}
+