There is a main difference, you call a function pointer at address 0 (which is an invalid address), it is a null pointer assignment. this never happens because Arduino resets the loop routine runs over and over again forever:ĭigitalWrite(led, HIGH) // turn the LED on (HIGH is the voltage level)ĭigitalWrite(led, LOW) // turn the LED off by making the voltage LOW Serial.println("reset") //print reset to know the program has been reset and Serial.begin(9600) //initialize Serial Port initialize the digital pin as an output. the setup routine runs once when you press reset: BUT, the trick is: in setup() function, the FIRST thing that happens is we write HIGH to the pin 12, which is called our reset pin (digitalWrite(resetPin, HIGH), thereby pulling the Arduino RESET pin HIGH. This would therefore disable Arduino from every running.
Typically, this would be a problem because when the application starts up, all pins get pulled LOW. Pin 12 gets connected to the RESET pin by one wire. In this example, pin 13, connected to the internal LED pin 13 is blinking. electronically, using only 1 wire connecting an OUTPUT pin (12 in this example) to the RESET pin.
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