Доброго дня или вечера, есть такой вопрос. у меня есть такой девайс. Если его использовать как управляющее устройство для реле или транзисторов..  При

int ledPin = PF_4;				 // LED connected to digital pin 13
void setup()
{
  pinMode(ledPin, OUTPUT);	  // sets the digital pin as output
}

void loop()
{
  analogWrite(ledPin, 255);   // sets the LED on
  analogWrite(ledPin, 0);	// sets the LED off
}

Выдает 3.3 вольта... можно ли сделать чтобы 5 вольт было!?. а то 3.3 маловато... а обвязку делать лень) можно ли малой кровью)





The only tricky part would be the 5V output.  The Stellaris Launchpad does have access to a 5 volt rail from the USB connection, but the GPIO can only drive 3.3V output.  You could achieve a 5V output if you set the GPIO to open drain output, and used a pull-up resistor to tie the GPIO to 5 volts.  When you need the GPIO low, Stellaris would drive it low.  When you need it at 5V, Stellaris will set the GPIO to open drain, and the pull-up will bring the signal up to 5 volts.

Hope this helps, and have fun!

You must use some consideration in the value of such pull-up R.  Stellaris GPIO usually default into 2mA sink (pull to ground) capability.  Thus a 2K7 pull-up will be w/in the default capability of the GPIO - and realize well-shaped waveforms should "reasonable" capacitance be encountered.  (too small a pull-up may be damaging to your MCU's GPIO!)



You have a wealth of GPIO on the board suggested.  Programming effort greatly simplifies should you route your driving signal to "multiple" timer input pins - in parallel.  In this means - you create a unique interrupt handler (per timer) which can more easily manage the differing count requirements - eliminating any possible conflicts created by the necessarily more complex - single interrupt handler.  (be sure that you properly label each/every of these timer IRQs w/in your, "Start-Up" file...)



Вроде ответ но не понимаю
Раздел: Песочница или Вопрос-Ответ