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1  Using Arduino / Installation & Troubleshooting / Re: problem with mac on: August 31, 2011, 01:47:04 pm
What type of Mac are you using?

On my MacBook Air running lion the proper serial port is /dev/tty.xxxx-SerialPort-1

- Matt
2  Using Arduino / Project Guidance / Re: I think my ADC friend, anything else to test before replacing the chip? on: August 31, 2011, 01:28:00 pm
I'm quite embarrassed to admit it, but this turned out to be a case of "tinkering late at night after a long day in the office" and can be chalked up to a simple oversight. I managed to plug into D5 instead of A5, arg......

Thanks to all who replied, and I sincerely apologize for wasting space on the board. As penance I will try to drop by more often to give input on any questions I can help with.

- Matt
3  Using Arduino / Project Guidance / I think my ADC friend, anything else to test before replacing the chip? on: August 31, 2011, 02:04:11 am
Board: Arduino Uno

I suspect the ADC on my Arduino has fried. When I call analogRead() on any of the pins (tried 3,4,5) and print the value to the serial port I read a value that starts at 300 and drops until it stabilizes around 250, similar to what you see for a floating pin. Here is the pertinent part of the code I am using for testing.

Code:
void loop()
{
  val = analogRead(5); 
  Serial.println(val);
}

The output on the serial monitor looks something like:

Quote
300
295
290
284
...
256
255
256
255

I have the wiper of a pot connected to pin 5 and have used a volt meter to make sure the pot is not faulty.

At this point I'm assuming the ADC is friend and I need a new chip. Is there anything else worth looking into before I place the order?

Thanks.

- Matt

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