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1  Using Arduino / Storage / Re: How to get name of directory when directory name is unknown? SdFat on: Today at 10:51:39 am
Have you tried running the example on the reference page I linked too, it's using Serial.print(entry.name()); to print the file/directory name.
You code snippet does not show if your using the standard SD library as the function names do not seem to match.
isDirectory() vs isDir()
2  Using Arduino / Storage / Re: How to get name of directory when directory name is unknown? SdFat on: Today at 01:48:13 am
I have not used the SD library but a quick look at the reference page seem to point to you using FileOpenNextFile and isDirectory to determine if next file is a directory or file. You can then extract the directory name using .name (all according to the reference)
3  Topics / Robotics / Re: Making a barrier for an Arduino on: August 21, 2014, 11:14:49 am
I have seen robot lawn mowers that use a buried cable to define perimeter. Maybe you could research how they detect and use it to stop the mower from crossing the line.
4  Community / Exhibition / Gallery / Re: Arduino WordClock on: August 21, 2014, 08:02:16 am
Each MAX7219 can control 64 LED's with 8x8 display being the most common layout but you could arrange the LED's in any pattern you want as long as they are wired on the 8x8 matrix style needed by the MAX7219 chip. Where it would become more complicated is determining what LED is what when they are set out in a non 8x8 pattern. For a simple word clock this would be relatively easy as the LED's go on/off in set patterns but if you want to include scrolling text then it will become really complex.
5  Using Arduino / LEDs and Multiplexing / Re: problem with the 8X8 linksprite led dot matrix board on: August 21, 2014, 07:07:39 am
i got rid of the ic socket and soldered the max chip in direct
A couple of probably stupid questions but...
Did you solder the chip in the correct way round?
Are you good at soldering as the IC could have been baked else?
6  Using Arduino / Programming Questions / Re: Compiling USB shield on: August 21, 2014, 07:03:42 am
What device are you trying to compile for?
I downloaded the zip package, extracted and renamed it, copied to libraries directory and tried compiling a few examples without problem.
7  Using Arduino / LEDs and Multiplexing / Re: problem with the 8X8 linksprite led dot matrix board on: August 20, 2014, 10:41:25 am
Do you have the 8x8 LED matrix on the right way round?
8  Using Arduino / Microcontrollers / Re: Using PROGMEM with Attiny 85 on: August 19, 2014, 11:58:30 am
At a guess I would say pgm_read_byte only reads byte values (8 bits) but both of your arrays are defined as int (16 bits).
Can you define the arrays as byte or does the range exceed 0-255
9  Community / Bar Sport / Re: Winter vs Summer on: August 19, 2014, 10:39:59 am
Crawley is some six degrees north of the latitude of St Johns, Nova Scotia, a place not noted for its balmy climate.

Crawley is doing quite nicely, I'd say.
Not today though.
10  Using Arduino / Microcontrollers / Re: Atmega328 - 28PU bootloader issues with USBasp | DIY arduino on: August 15, 2014, 06:57:16 am
Glad you got it working okay.
11  Community / Bar Sport / Re: What Faggot means in the UK on: August 15, 2014, 06:52:49 am
This stuff?
12  Using Arduino / Microcontrollers / Re: Atmega328 - 28PU bootloader issues with USBasp | DIY arduino on: August 15, 2014, 05:42:51 am
Ar the moment i dont have a pull down resistor, just a push button switch between the reset pin and ground.  Should i put a resistor in?  I will try all the things suggested after class.  Thanks for all the help!
Pullup not pulldown. You need to connect it between reset and VCC not reset and GND.
13  Using Arduino / Microcontrollers / Re: Atmega328 - 28PU bootloader issues with USBasp | DIY arduino on: August 14, 2014, 11:59:35 am
Do you have a 10K resistor pulling reset (pin 1) to V+ and how are you connecting the USBasp to the 328. All the programming pins you use look to be in the right place on the board but to what pins are they connected on the USBasp.
14  Topics / Device Hacking / Re: RF Communication, send data with an arduino, receive without. on: August 14, 2014, 03:24:53 am
Maybe a more simplistic though slightly bulkier (and less fun) option might be to just simulate the potentiometer control using the lillypad and keep the current transmitter/receiver. No need then to try decoding the RF signal, just work out the centre point and range of the throttle pot and emulate it.
15  Using Arduino / Networking, Protocols, and Devices / Re: Large wireless network on: August 12, 2014, 05:21:10 am
What are you using the network for if all the Arduino's independently log the sensor data to an SD card?

If you want to give each arduino a static IP address then either hardcode it into the sketch before upload or store it in eeprom memory so it survives power down if it's set dynamically using buttons during sketch execution.

Quote
There is no need for sending information from server, except maybe for confirming messages.
30 to 200 network enabled Arduinos are likely to swamp your network/server. Might be better for the server to periodically request data from each arduino in turn.
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