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Topic: Using Arduino Uno TX and RX pins (Read 19262 times) previous topic - next topic

tim7

mr_johansen, is this the USB-to-Serial adapter you're using?

If so I'm not sure it will work with an Uno.  The Rx pin on the Uno's processor has a 1k pull-up (via the on-board USB adapter), which any external adapter has to overcome.  And I don't think the Arduino USB2Serial "Light" will be able to, because it's Tx pin is connected via a 500 Ohm resistance meaning it won't be able to pull the Uno's Rx pin below the threshold for logic-zero.


Grumpy_Mike

Quote
mr_johansen, is this the USB-to-Serial adapter you're using?

Well as he said it had a 9 pin serial connector then I don't think so.

tim7


Quote
mr_johansen, is this the USB-to-Serial adapter you're using?

Well as he said it had a 9 pin serial connector then I don't think so.

That was ThomasJJ, who seems to have a different adapter.

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