arduino.cc posted:

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.
Arduino can sense the environment by receiving input from a variety of sensors and can affect its surroundings by controlling lights, motors, and other actuators. The microcontroller on the board is programmed using the Arduino programming language (based on Wiring) and the Arduino development environment (based on Processing). Arduino projects can be stand-alone or they can communicate with software running on a computer (e.g. Flash, Processing, MaxMSP).

peepsalot posted:

Use an old ATX power supply or a find a 12V wall wart like in the picture, or a lab bench power supply set to 12V, or 8 alkaline cells in series, or a 12V lead acid or 10 NiMh or NiCd in series or pretty much anything that's even close to 12V. It will accept a wide range of power supply voltages, from 7V up to 30V actually, as long as you are properly limiting the current (it explains using the current limiting pot in the article).

Huskalator posted:

Where is the best place to purchase one of these to be shipped to the US?

I have found a site that has an UNO for 10.95 with 2.95 shipping but I'm kinda skeptical about that.

Goon Matchmaker posted:

Is there any way to tell if I've horked the boot loader on my rainbowduino? I was messing with it earlier today, uploading various sketches to see what they did, and now my computer no longer recognizes it as a USB-Serial device. As far as I know I didn't tell the IDE to flash the boot loader. Do these things get messed up randomly or something?

TVarmy posted:

TVarmy posted:

The Teensy and Digisparks are cool if you're interested in either a smaller/cheaper footprint, which is great for certain projects.

Get some mosfets and an led light strip roll for big led projects.

If you're interested in controlling an appliance, say a rice cooker for sous vide cooking, a relay kit or solid state relay is nice. Be careful of mains power, though. And never plug the Arduino into a bare mechanical relay, as it takes too much power, and if it does switch, when it turns off, it can send a jolt that fries can fry the board.

A raspberry pi is kind of a peripheral, in the way that a tall wags a dog, but the two boards work really well together, and it really simplifies stuff like hosting a server that works with physical input/output, logging data, tweeting, processing images from a camera, etc. Just send the Arduino commands from python or c over serial.

Acid Reflux posted:

huhu, I've got a discrete component collection that rivals lots of small stores. I'd be *more* than happy to put together a care package for you with a variety of capacitors, diodes, and a wider range of resistors for you if you'd like. Nothing worse than being stuck in the middle of nowhere, unable to complete a project due to lack of materials.

output posted:

548
556
503
516
454
483
426
457
397
429
378
400
322
346
239
279
143
195
53
117
0
88
34
107

Bad Munki posted:

If I'm reading your output right, it's printing x,y,x,y,x,y,x,y,x,y etc, so every other value is for one axis. In which case, that 0 was preceded by 53 and followed by 34, which doesn't seem TOO far off. I mean, you were bring the joystick "down" along that axis. What is the full range of each axis? That is, does it go from 0 at the middle up/down to +/-MAX, or is it 0 on one edge and MAX on the other?

evensevenone posted:

Is it normal for left and right to be on separate axes? Shouldn't they just be one axis?

Can you post a diagram of how you have it connected?

Vlad the Retailer posted:

What sort of peripherals/sensors do you have available?

One project that comes to mind is writing an emulator for an early microcomputer, like the SSEM or the Kenbak-1. The instruction set shouldn't take too long to implement, and the only components you need are switches and LEDs, plus a few multiplexers or shift registers depending on how many of those you add.

Mega Fone posted:

Does anybody have any recommendations for starter kits to get in the UK?

I'm thinking about getting this one

Looking around each website does their own set so I don't really know which one I should go for as I don't have anything specific in mind and just want to create cool things.

mod sassinator posted:

How big is your sketch? Usually a linker error like that means your sketch is too big to fit in flash memory. Even though it might be physically smaller than the available flash memory (usually 30-28kb on an Uno.. the bootloader takes a few kilobytes up) the compiler sometimes needs to move variables and code and pad them to be properly aligned for the CPU to access. Sometimes when you're starting to near the limits of available flash memory the compiler can't relocate things properly and gives up with an error like you see. Check out this for more of a description: http://stackoverflow.com/questions/8188849/avr-linker-error-relocation-truncated-to-fit Changing the loop condition is probably changing the code a bit and causing the relocation error (comparing against zero is usually a native jump or branch instruction, but comparing against an arbitrary value like -1 likely requires a different jump and more code). See if you can trim down your sketch and simplify or remove parts that aren't important.

evil_bunnY posted:

Get a zero and forget about silly memory limitations.

mod sassinator posted:

What board are you using right now, like a little Trinket or other ATtiny85-based board? Those things are super small on memory and just have a few kilobytes to play with. If you want a small board with more memory check out the Teensy 3.1, Arduino Micro, or Adafruit's feathers (like the 32u4 or M0 feather).

Sagebrush posted:

Dunno why you're using setupCountdown-1 instead of just starting at 5 and setting your end condition to >= 0, but yes, that will work.

huhu posted:

code:

void screen3(){
    int setupCountdown = 5;
    while(setupCountdown > 0){
        lcdClearLine();
        lcd.setCursor(0,0);
        lcd.print("Creating Folder");
        lcd.setCursor(0,1);
        lcd.print("Starting in " + String(setupCountdown) + "s");
        delay(1000);
        setupCountdown--; 
    }     
}

Is there something I'm missing that changing the content of the paranthases of the while loop to (setupCountdown >= 0) or (setupCountdown >-1) results in an error?

code:

sketch\camera.ino.cpp.o: In function `screen3()':

C:\Documents and Settings\huhu\Desktop\Photostitch\camera/camera.ino:124:(.text._Z7screen3v+0x9c): relocation truncated to fit: R_AVR_7_PCREL against `no symbol'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling.

simplefish posted:

Please do, I'm just getting started with Arduino, I want to avoid doing the same thing

Collateral Damage posted:

Vcc and Gnd?

Combat Pretzel posted:

Macros are handled different than regular C-ifs and need to be ended with #endif.

Goes pretty much like this:

code:

#if condition
    hurrdurrdurr();
    hurrdurrdurr();
    hurrdurrdurr();
    hurrdurrdurr();
#endif

Can do else-if, too with #elif and #else.

They're also resolved at compile time. Means if the condition for the section doesn't resolve, the code isn't compiled in.

In your case, it looks whether __SAM3X8E__ is defined in one of the header files, and if it is, the code in the #if section applies. It it won't, the #else section will apply. This is one way of creating portable code. Depending on what platform you'll be compiling the project, different defines will be set.

Star War Sex Parrot posted:

Neat. Reminds me of the intervalometer I made a year or so ago:



Could set number of shots, time before beginning the sequence, time interval between shots, and exposure time (since camera was in Bulb mode).