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Author Topic: Porgramm does't start if 12v power only is used  (Read 464 times)
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Hi,

my programm does only start when I open the serial monitor or reset the arduino with the reset button, but I would like the arduino start working as soon it gets power.
Does anybody have a clue what I have could have done wrong?
I alredy eliminated  all Serial comm lines in my code.
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The Arduino will boot up as soon as it gets power. Is there any other hardware involved that might need time to initialise? Maybe you have a timing issue at startup. What have you got attached to the Arduino, and what sketch are you running? What happens when you just power up the Arduino?
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I uploaded "blink" so it is not the sketch. And I observed the same.
I disconnected the arduino from my hardware and "blink" startet as soon I connected the power. So it must be the hardware I conected.

My hadware consists of some bottons with 10K pull up resistors, MOSFETS on the PWM pins with RGB LEDS and some potiometers on the Analog in pins. I also use the V in pin to power the MOSFETS
PIN 13, 0, 1 are not connected.
When I connect the board to the 12V input the "on" LED os on and the L LED is also continously on but no so bright as it used to be.
Any clue?  
« Last Edit: April 29, 2012, 02:16:25 am by lukeskymuh » Logged

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Make sure the input is the right way round, outer ring -ve.
Make sure your power supply has a DC output not an AC one.
Make sure your power supply can supply sufficient current.
Measure the voltage on the Vin pin, this should be 0.7 V short of the power supply voltage.
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