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+Arduino Scetch for MicroController Test Board with 4-Digit-Display and one button
+
+![mctestboard](https://raw.githubusercontent.com/faustech/mctestboard/master/mctestboard_bb.jpg)
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+// MicroController Test Board with 4-Digit-Display and one button
+// https://github.com/faustech/mctestboard
+// License: MIT License
+
+#include <Arduino.h>
+#include <Time.h>
+#include <Thread.h>
+#include <SevenSegmentExtended.h>      // Extended TM1637 library https://github.com/bremme/arduino-tm1637
+
+const byte PIN_CLK = 2;                // Define CLK pin (for 4-Digit Display)
+const byte PIN_DIO = 3;                // Define DIO pin (for 4-Digit Display)
+const byte buttonPin = 4;              // Analog PIN Button (a 10K resistor is necessary)
+const byte led = 13;                   // Default onboard LED
+long buttonPressed = 0;                // Button (PIN4) ms pressed counter
+int buttonView = 0;                    // Button (PIN4) viewing state
+long previousButtonMillis = 0;         // Button (PIN4) previous press counter
+
+long buttonInterval = 10000;           // Interval for highlighting 4-Digit Display after pressing button
+long buttonLongPress = 2500;           // Interval for long press button action
+long buttonCheck = 200;                // Interval for checking button state
+long ledPulse = 1000;                  // Interval for LED blinking pulse
+bool displayOn = false;                // Boolian for store display power status
+
+// Threads:
+Thread ledThread = Thread();           // Create thread for LED pulse indication
+Thread pressButtonThread = Thread();   // Create thread for button state checking
+
+SevenSegmentExtended display(PIN_CLK, PIN_DIO);
+
+void setup() {
+  Serial.begin(9600);                // initializes the Serial connection @ 9600 baud for debug
+  serStr("starting setup...");
+
+  pinMode(buttonPin, INPUT);
+  display.begin();                   // Initializes the display
+  displayOn = true;
+  display.setBacklight(100);         // Set the brightness to 100 %
+  display.print("INIT-INIT");        // Display INITx2 on the display
+
+  // LED blinking thread:
+  ledThread.onRun(ledBlink);
+  ledThread.setInterval(ledPulse);   // Interval for LED blinking
+  // Button state cheking thread:
+  pressButtonThread.onRun(pressButton);
+  pressButtonThread.setInterval(buttonCheck); // Interval for checking button pressing
+
+  display.off();
+  displayOn = false;
+  serStr("...setup finished");
+}
+
+void loop() {
+  // Threads init:
+  if (ledThread.shouldRun())
+    ledThread.run();
+  if (pressButtonThread.shouldRun())
+    pressButtonThread.run();
+}
+
+// LED pulse blinking thread
+void ledBlink() {
+  static bool ledStatus = false;     // LED status bool
+  ledStatus = !ledStatus;            // Invert LED state
+  digitalWrite(led, ledStatus);      // Activate LED state
+}
+
+// Check button pressing thread
+void pressButton() {
+
+  // Display off after buttonInterval ms slack
+  unsigned long currentMillis = millis();
+  if (currentMillis - previousButtonMillis > buttonInterval) {
+    previousButtonMillis = currentMillis;
+    if (displayOn == true) {
+      display.off();
+      displayOn = false;
+      serStr("display off after slack");
+    }
+  }
+
+  if (digitalRead(buttonPin) == HIGH) {
+    serStr("button pressed");
+    buttonPressed = buttonPressed + 200;
+    if (buttonPressed > buttonLongPress) {
+      buttonPressed = 0;
+      longPress();
+    }
+    previousButtonMillis = currentMillis;
+    display.on();
+    displayOn = true;
+    if (buttonView == 0) {
+      display.printTime(hour(), minute(), true);
+      serStr("time showed");
+    } else if (buttonView == 1) {
+      display.print("----");
+      serStr("something was showed");
+    }
+    if (buttonView < 1) buttonView += 1;
+    else buttonView = 0;
+  } else {
+    buttonPressed = 0;
+  }
+}
+
+// Send string to serial monitor with millis() counter
+void serStr(const char* serString) {
+  long currentTime = millis();
+  String space = " ";
+  String stringToPrint = currentTime + space + serString;
+  Serial.println(stringToPrint);
+}
+
+// Send string to serial monitor with millis() counter
+void longPress() {
+  serStr("long button pressed");
+  display.print("button was pressed long time");
+}
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