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+// Using Arduino as keyboard emulator on iOS devices (HID/Keyboard)
+//
+// *used Arduino Pro Micro Clone, 5v
+// *selected Arduino Leonardo as board when compiling
+//
+// for use with iOS without complaining, modify the USBCore.h file to tell the arduino to use less usb poiwer 
+// change USB_CONFIG_POWER from 500 to 100, on line 98, see below
+//
+//  bMaxPower in Configuration Descriptor
+//   #define USB_CONFIG_POWER_MA(mA)                ((mA)/2)
+// #ifndef USB_CONFIG_POWER
+//   #define USB_CONFIG_POWER                      (100)
+// #endif
+//
+// on mac the USBCore.h is located at:
+//  /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino/USBCore.h 
+//
+// ref: https://arduino.stackexchange.com/questions/60771/arduino-micro-draws-too-much-power-from-iphone-how-can-i-change-that
+//
+// tested on:
+// iPhone 6 + iOS 12.4.4
+// iPhone X + iOS 14.2
+// 
+
+#include <Keyboard.h>
+
+void setup() {
+  pinMode(3,INPUT_PULLUP);
+}
+
+void loop() {
+  Keyboard.begin();
+  if(digitalRead(3) == 0)
+    {
+        Keyboard.write('A');
+        delay(100);
+    }
+  Keyboard.end();
+}