Commit 2600fb5

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add sleep and wdt examples

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	`1`	`+#include <avr/sleep.h>`
	`2`	`+`
	`3`	`+#define BUTTON_INT_PIN 2`
	`4`	`+`
	`5`	`+void setup() {`
	`6`	`+ Serial.begin(115200);`
	`7`	`+ Serial.println("start");`
	`8`	`+ delay(200);`
	`9`	`+ pinMode(BUTTON_INT_PIN, INPUT_PULLUP);`
	`10`	`+ attachInterrupt(digitalPinToInterrupt(BUTTON_INT_PIN), isrButtonTrigger, FALLING);`
	`11`	`+}`
	`12`	`+`
	`13`	`+void loop() {`
	`14`	`+ // sleep unti an interrupt occurs`
	`15`	`+ sleep_enable(); // enables the sleep bit, a safety pin`
	`16`	`+ set_sleep_mode(SLEEP_MODE_PWR_DOWN);`
	`17`	`+ sleep_cpu(); // here the device is actually put to sleep`
	`18`	`+ sleep_disable(); // disables the sleep bit, a safety pin`
	`19`	`+`
	`20`	`+ Serial.println("interrupt");`
	`21`	`+ delay(200);`
	`22`	`+}`
	`23`	`+`
	`24`	`+void isrButtonTrigger() {`
	`25`	`+ // nothing to do, wakes up the CPU`
	`26`	`+}`
	`27`	`+`

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	`1`	`+#include <avr/wdt.h>`
	`2`	`+`
	`3`	`+void setup() {`
	`4`	`+ pinMode(LED_BUILTIN, OUTPUT);`
	`5`	`+ digitalWrite(LED_BUILTIN, LOW);`
	`6`	`+`
	`7`	`+ wdt_enable(WDTO_4S);`
	`8`	`+ // First timeout executes interrupt, second does reset.`
	`9`	`+ // So first LED 4s off`
	`10`	`+ // then LED 4s on`
	`11`	`+ // then reset CPU and start again`
	`12`	`+ WDTCSR \|= (1 << WDIE);`
	`13`	`+}`
	`14`	`+`
	`15`	`+void loop() {`
	`16`	`+ // the program is alive...for now.`
	`17`	`+ wdt_reset();`
	`18`	`+`
	`19`	`+ while (1)`
	`20`	`+ ; // do nothing. the program will lockup here.`
	`21`	`+`
	`22`	`+ // Can not get here`
	`23`	`+}`
	`24`	`+`
	`25`	`+ISR (WDT_vect) {`
	`26`	`+ // WDIE & WDIF is cleared in hardware upon entering this ISR`
	`27`	`+ digitalWrite(LED_BUILTIN, HIGH);`
	`28`	`+}`
	`29`	`+`

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