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1  Using Arduino / Sensors / Re: conntecting 4 srf08 sensors on: January 28, 2011, 03:46:13 am
First of all, you must connect the srf's one by one and chance the adress(at least for 3 of them , so that they all have different adresses).
Connecting shouldn't be to difficult, just connect the 5V and GND to arduino power pins. And the SDA and SCL go to pin 20 and 21. Pull up resistors are included in the board.
Then just send these commands to the old adress: 0xA0, 0xAA, 0xA5, <new adress> . So if we want to chance the adress to E2:
Code:
Wire.beginTransmission(0x70);
Wire.send(0xA0);                         
Wire.send(0xAA);   
Wire.send(0xA5);
Wire.send(0xE2);
Wire.endTransmission();
2  Using Arduino / Installation & Troubleshooting / Re: Arduino mega 2650 usb problem‏ on: January 28, 2011, 03:32:24 am
Ok, but if i understand correct that is to reflash the 8U2 via the usb port. But the problem is that the pc doesn't recognize the 2650 at all. It does not show up in the device manager. Is it possible to reflash the complete 8U2 with the provided "MEGA-dfu_and_usbserial_combined.hex" file via the isp header with a stk 500?
3  Topics / Robotics / Re: MKII Auto tank on: January 26, 2011, 12:26:03 pm
That looks awesome...
To import images from flickr:
- Go to share this -> Grab the HTML/BB code
- Select BBCode
- Paste it here like so:
[u rl=http://www.flickr.com/photos/58848339@N08/5390459006/][i mg]http://farm6.static.flickr.com/5140/5390459006_e98b09fd1d.jpg[/img][/url]
[u rl=http://www.flickr.com/photos/58848339@N08/5390459006/]MKI TESTING 1[/url] by [u rl=http://www.flickr.com/people/58848339@N08/]overclock1[/url], on Flickr

Of course without the space between het "u" and "r" smiley-wink
4  Using Arduino / Installation & Troubleshooting / Re: Arduino mega 2650 usb problem‏ on: January 26, 2011, 11:11:17 am
No, if we send serial data we can receive it trough pin 0 and 1. Not via the USB connection. Also the leds doesn't light up. How do you reflash the firmware on the Mega 8U2? And does that dispose my chance on factory waranty?

Btw: I have access to a stk 500 and another arduino if necessary...
5  Using Arduino / Installation & Troubleshooting / Arduino mega 2650 usb problem‏ on: January 26, 2011, 03:45:35 am
We have encoutered a problem with our new arduino mega 2650 board. After a week it stopped recogniting the board as a usb/com port. We where powering the board with a external ac/dc 12v adaptor. There was a h-bridge(devantech md22) and a rs232/ttl converter connected to the board. Both where powered trough the on-board power regulators.
 
The board itself is still working, and we are able to program it trough pin 0 and 1 with the ttl converter. When connected with the usb plug it does start up and runs as normal, but programming trough usb is impossible. Also the tx and rx leds doesn't light up once. There is no device visible in the device manager when plugged in.

Hope you guys can help..
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