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Initial (boot up) state of digital IO


#1

When I first apply power to a Domino (usb), the digital pins output somewhere around 2.3V. Once the pin is instantiated in code, it can be 0V or 3.3V.

You can see this through the on board LED… it’s partially lit for a few seconds before any C# code is run.

Is it possible to set the output to 0V while booting up?.. in the CLR maybe?


#2

They have pull up resistors, this is why you see them partially high.

If you need a pin 0V at power up then a 1K pull down resistor will do the job.