use TaskScheduler

- use task for displaying colon
- update display only when minute changes

include/display.h

@@ -9,7 +9,12 @@
 
 namespace Display {
 
+  void displayColon();
+
   uint8_t brightness = BRIGHTNESS;
+  int currentMin = -1;
+
+  Task blinkColon(500, TASK_FOREVER, displayColon, &ts, true);
 
   // Create display object
   Adafruit_7segment clockDisplay = Adafruit_7segment();
@@ -35,6 +40,7 @@ namespace Display {
 
   void changeBrightness(bool increase) {
     increase ? brightness = (brightness + 2) % 15 : brightness = (brightness - 2) % 15;
+    clockDisplay.setBrightness(brightness);
   }
 
   void adjustBrightness() {
@@ -44,12 +50,20 @@ namespace Display {
     } else {
       brightness = 1;
     }
+    clockDisplay.setBrightness(brightness);
   }
 
-  void displayColon(bool on) {
+  void displayColon() {
-    clockDisplay.setBrightness(brightness);
+    static bool colonOn = false;
-    clockDisplay.drawColon(on);
+
+    if (colonOn && currentMin != minute()) {
+      currentMin = minute();
+      displayTime();
+    }
+    clockDisplay.drawColon(colonOn);
     clockDisplay.writeDisplay();
+    
+    colonOn = !colonOn;
   }
 
   void displayValue(int value) {
@@ -60,6 +74,6 @@ namespace Display {
     clockDisplay.begin(DISPLAY_ADDRESS);
     clockDisplay.setBrightness(brightness);
     displayTime();
-    displayColon(false);
+    displayColon();
   }
 }

include/ir.h

@@ -64,7 +64,7 @@ namespace Ir {
     void loop() {
         if (readCommand()) {
             Display::displayValue(lastCommand);
-            Display::displayColon(false);
+            // Display::displayColon(false);
             delay(1000);
             switch (lastCommand)
             {

platformio.ini

@@ -20,6 +20,7 @@ lib_deps =
 	jchristensen/Timezone@^1.2.4
 	ottowinter/AsyncMqttClient-esphome@^0.8.5
 	crankyoldgit/IRremoteESP8266@^2.7.18
+	arkhipenko/TaskScheduler@^3.4.0
 
 [env:dev_mode]
 build_flags = -D IR=1

src/esp_clock.cpp

@@ -1,4 +1,8 @@
 #include <Arduino.h>
+
+#include <TaskScheduler.h>
+Scheduler ts;
+
 #include "wifi.h"
 #include "ota.h"
 #include "ntp_time.h"
@@ -42,11 +46,6 @@ void loop() {
       wifi.disconnect();
     }
   }
-  Display::displayTime();
-  Display::displayColon(true);
-  delay(500);
-  Display::displayColon(false);
-  delay(500);
 
-  yield();
+  ts.execute();
 }