STK1000/Troubleshooting

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The RED power LED is not on

The DC cable is not connected
Wrong power supply polarity is used


The LEDs display a random pattern when a cable is connected from the GPIO header to the LED header.

When the CPU does not drive the output pins the input of the inverters driving the LEDs will not have a defined input potential. This is seen as a random pattern on the LEDs. Check the code running on the CPU.


When a cable is inserted from the GPIO header to the LED header the CPU is reset and the starter kit make a high pitch sound.

The 3.3V pin on one of the headers have been shorted to GND.
Static version created: 2007-03-07
Copyright (c) 2007 Atmel Corporation