similar to standard Arduino Button example

examples/Button/Button/Button.ino

@@ -0,0 +1,56 @@
+/********************
+Arduino generic menu system
+control led on/off delays
+
+Rui Azevedo - ruihfazevedo(@rrob@)gmail.com
+
+output: Serial
+input: Serial
+mcu: nano328p
+*/
+
+#include <menu.h>
+#include <menuIO/serialOut.h>
+#include <menuIO/chainStream.h>
+#include <menuIO/serialIn.h>
+
+using namespace Menu;
+
+#define LEDPIN LED_BUILTIN
+#define MAX_DEPTH 1
+
+int timeOn=10;
+int timeOff=90;
+
+MENU(mainMenu, "Blink menu", Menu::doNothing, Menu::noEvent, Menu::wrapStyle
+  ,FIELD(timeOn,"On","ms",0,100,10,1, Menu::doNothing, Menu::noEvent, Menu::noStyle)
+  ,FIELD(timeOff,"Off","ms",0,100,10,1,Menu::doNothing, Menu::noEvent, Menu::noStyle)
+  ,EXIT("<Back")
+);
+
+serialIn serial(Serial);
+MENU_INPUTS(in,&serial);
+
+MENU_OUTPUTS(out,MAX_DEPTH
+  ,SERIAL_OUT(Serial)
+  ,NONE//must have 2 items at least
+);
+
+NAVROOT(nav,mainMenu,MAX_DEPTH,in,out);
+
+void setup() {
+  pinMode(LEDPIN, OUTPUT);
+  Serial.begin(115200);
+  while(!Serial);
+  Serial.println("Menu 4.x");
+  Serial.println("Use keys + - * /");
+  Serial.println("to control the menu navigation");
+}
+
+void loop() {
+  nav.poll();
+  digitalWrite(LEDPIN, HIGH);
+  delay(timeOn);
+  digitalWrite(LEDPIN, LOW);
+  delay(timeOff);
+}

examples/Button/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter, extra scripting
+;   Upload options: custom port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;
+; Please visit documentation for the other options and examples
+; http://docs.platformio.org/en/stable/projectconf.html
+
+
+[platformio]
+src_dir=Blink
+; lib_dir=~/Arduino/Libraries
+
+[env:nanoatmega328]
+platform = atmelavr
+board = nanoatmega328
+framework = arduino
+upload_port=/dev/ttyUSB*
+upload_flags=-V
+build_flags = -DNODEBUG
+
+; [env:uno]
+; platform = atmelavr
+; board = nanoatmega328
+; framework = arduino
+
+; [env:due]
+; platform = atmelsam
+; board = due
+; framework = arduino
+; build_flags = -Wno-comment -Wno-reorder -Wno-strict-aliasing -Wno-builtin-macro-redefined
+
+; [env:teensy31]
+; platform = teensy
+; board = teensy31
+; framework = arduino
+; build_flags = -DMENU_USERAM