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1  Forum 2005-2010 (read only) / Troubleshooting / Re: RX / TX Lights constantly on with external pow on: August 10, 2007, 09:56:59 am
Thanks for the heads up. Is there a way to burn the new bootloader to the NG via USB?
2  Forum 2005-2010 (read only) / Troubleshooting / Re: RX / TX Lights constantly on with external pow on: August 09, 2007, 06:52:43 pm
I haven't tried 0009 so far, since there's no Linux release, and I've been reluctant to compile from CVS. I'll take a look now.

Quote
that would be a bad idea to connect them together, as you would possibly damage both the USB chip and the Atmega, since when the Atmega TX is low the USB TX could drive current into it, and vice-versa

If that's the case, http://www.arduino.cc/en/Guide/Troubleshooting is giving dangerous advice; the part that recommends connecting RX and TX together should be edited out.

So is connecting RX to one of the GND pins on the Arduino via a resistor the safest thing to do?

3  Forum 2005-2010 (read only) / Troubleshooting / Re: RX / TX Lights constantly on with external pow on: August 08, 2007, 04:44:15 pm
Thanks; it indeed was.

Does everyone using an external power source experience this? In other words, is it a known and confirmed "bug"?

Another question: Would it hurt to keep RX and TX connected to each other all the time I don't use them, to work around this?
4  Forum 2005-2010 (read only) / Troubleshooting / Re: RX / TX Lights constantly on with external pow on: August 07, 2007, 10:03:48 pm
Everything works when the Arduino is powered via USB, but nothing works (only the PWR led is lit as normal, and the TX and RX leds are constantly lit very dimly) when the DC power supply is connected.
5  Forum 2005-2010 (read only) / Troubleshooting / Re: RX / TX Lights constantly on with external pow on: August 07, 2007, 08:51:36 pm
I just tried executing a program that works when the Arduino is powered via USB; it didn't work, so I immediately disconnected the adapter.

What could be wrong here?
6  Forum 2005-2010 (read only) / Troubleshooting / RX / TX Lights constantly on with external power on: August 07, 2007, 07:08:14 pm
Hi,

Upon my first time connecting external power to the Arduino, I noticed that the RX and TX leds are dimly lit all the time the power is connected. This is not the case when powering through USB.

My adapter is a 9V DC 1A center positive one.

Is this normal?

7  Forum 2005-2010 (read only) / Interfacing / Re: Interfacing Arduino with Numeric LEDs on: August 07, 2007, 09:03:40 pm
And how about doing it via USB power? I just noticed that my external adapter isn't working..
8  Forum 2005-2010 (read only) / Interfacing / Re: Interfacing Arduino with Numeric LEDs on: August 07, 2007, 06:24:35 pm
Thanks for the quick reply.

Would it be dangerous to use the Arduino's 5V power out (with an external adapter) to do this? I don't have any other 5V supply.
9  Forum 2005-2010 (read only) / Interfacing / Interfacing Arduino with Numeric LEDs on: August 07, 2007, 05:58:27 pm
Hi,

I'm just getting started with Arduino, and would like to learn a simple way to use it to control some numeric LED digit displays that I have lying around.



I don't have the specifications of the LEDs; all I know is that they're common cathode, and that their voltage ratings are somewhere between 1V and 2.3V.

From large to small, the following text is imprinted on their sides:

KPS-1106 / A S R N D (corresponding to each lower leg)
FYS-8011BS-31G
CLS0561CRWH

I couldn't find their specifications by doing searches with this text on the web. I haven't dealt with numeric LEDs before, so I'd appreciate links to any common information regarding how they work as well.

Regards
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