Show Posts
Pages: 1 ... 3 4 [5] 6 7 ... 30
61  Using Arduino / Project Guidance / Re: Can I secure my code from being copied on arduino boards? on: January 27, 2013, 07:47:18 pm
The arduino board is open source. Your project is not unless you make it so. As long as you don't share your files with anyone no one can see your code. And if someone really really wanted to go to some trouble they could maybe duplicate your chip. If that is a concern then CrossRoads' suggestion of Lock Bits would be of use to you.
62  Using Arduino / Installation & Troubleshooting / Re: Troubleshooting sketchy uploads to breadboard on: January 27, 2013, 06:45:29 am
Like I said, the reset pin is wired to the reset pin on the arduino so it should act just like it does on the arduino.

But that's irrelevant because I cannot even pull it down manually. There's no problem with it being pulled up, it's running the last uploaded sketch just fine. I just can't get it to reset so it won't upload a new one.
63  Using Arduino / Installation & Troubleshooting / Re: Troubleshooting sketchy uploads to breadboard on: January 27, 2013, 04:45:58 am
I'm using an external oscillator. The problem seems to be that the reset wont pull down, not that it wont stay up. During upload I have the reset pin connected to the reset pin on the arduino so it should act exactly as it does on the board as far as I'm aware. Does anyone know why the arduino would refuse to reset when pulled directly to ground? I mean I have it completely disconnect from anything else, then I put a jumper straight to ground and it still operates normally, it wont reset.
64  Using Arduino / Installation & Troubleshooting / Re: Troubleshooting sketchy uploads to breadboard on: January 26, 2013, 10:04:11 pm
One thing I'm noticing is that while it doesn't work, I am completely unable to use the reset pin. The reset button doesn't working and it doesn't even reset when I short it to ground without any other connections. What would cause this? I think it is the problem.

Thanks.
65  Using Arduino / General Electronics / Re: Reliable digital Pot for audio on: January 26, 2013, 09:03:24 pm
Pretty expensive for just one channel. It's got the higher voltage but totally overkill on the resolution. Plus is doesn't seem to be suited for audio circuits which was one of my first issues above.

I'm afraid I might just have to figure out how to get the optoisolators working the way I need.
66  Using Arduino / General Electronics / Re: Reliable digital Pot for audio on: January 26, 2013, 08:45:07 pm
MAX5394 is 6v max, MAX5395 5.5v max.
67  Using Arduino / Installation & Troubleshooting / Troubleshooting sketchy uploads to breadboard on: January 26, 2013, 08:42:11 pm
I have my atmega328p on a breadboard with an 8Mhz chip and the arduino IDE set to Pro Mini 3.3v 8Mhz although I am powering it with 5v for uploading. Then I have the serial lines and the reset line connecting to the arduino board that has no chip seated. I also have D13 connected from the breadboard to the arduino because I found that helps. However it will work sometimes and sometimes it won't. Right now it wont. And it continues to not work even after restarting everything. I have the correct com port selected. I always get :
Quote
avrdude: stk500_getsync(): not in sync: resp=0x00

Whenever I do get it to work it's always randomly, I can't pinpoint what fixes it. Am I missing anything here? I've done this quite a few times and it's always so finicky.
68  Using Arduino / General Electronics / Re: Reliable digital Pot for audio on: January 26, 2013, 08:30:24 pm
The PGA23xx say they are for volume control but I actually need a pot, they don't mention resistance or anything. I need to control an effect pedal.
69  Using Arduino / General Electronics / Re: Reliable digital Pot for audio on: January 26, 2013, 06:09:10 pm
http://arduino.cc/forum/index.php/topic,74465.msg
This one is about the optoisolator. I never managed to find one with two outputs.

As for that chip, I know it says "audio" but I think that refers to the log taper. I actually want a linear taper. Does the word "audio" refer to the taper, or to it's ability to be used in audio applications? I mean I know it's a log taper but does that necessarily mean it is suited for audio applications?

Oh sorry, also the first issue I ran into was that my circuit uses 9v. So the digipot would need to be suited for that.
70  Using Arduino / General Electronics / Reliable digital Pot for audio on: January 25, 2013, 09:43:55 pm
So a while back I wanted to automate a guitar pedal with 5 pots. I was told that an actual digital pot chip is too noisy for an audio circuit. Also using optoisolation was really difficult, I never got it working right. I ended up giving up.

Has anyone done this? Is there a well documented way of doing it?

Thanks.
71  Using Arduino / Project Guidance / Re: Help a newbie with an important decision! on: January 25, 2013, 09:39:39 pm
Also with the uno you can take the atmega out rather than dedicating your entire arduino board to a project.
72  Using Arduino / Project Guidance / Re: 328 3v 8mhz boot loader on: January 25, 2013, 09:32:13 pm
Ok I figured it out. I had two main problems. First, the tinyusbavr was supposed to be powering the arduino while it programmed but I guess it wasn't doing it right (maybe something about the other 5v pins on the chip). I switched it to no power and powered the arduino with USB and it bootloaded fine. Then to program it I had to take it out of the arduino and stick the 8Mhz crystal on a breadboard, it wouldn't program with the 16Mhz chip in the arduino.
73  Using Arduino / Project Guidance / Re: 328 3v 8mhz boot loader on: January 25, 2013, 12:48:49 am
I am trying to bootload the pro mini 8Mhz board onto my 328 with a tinyusbavr but I get this error:

Quote
avrdude: verification error, first mismatch at byte 0x7980
         0x21 != 0x88
avrdude: verification error; content mismatch


I have no problems burning the regular UNO bootloader. I tried doing it on the arduino board and on a breadboard with different combos of 3/5v and 8Mhz crystal.

Any advice?

Thanks.
74  Using Arduino / Project Guidance / Re: How to get power supply from Car on: January 22, 2013, 04:44:44 am
There should be a battery wire for the stereo, just splice into that. Sometimes it's also called the memory wire because it's always on, keeping the volatile memory working.
75  Using Arduino / Project Guidance / 328 3v 8mhz boot loader on: January 22, 2013, 04:42:41 am
I wish to use the atmega328 at 3v but still with ok timing. I have some 8mhz crystals, would the arduino pro mini boot loader work fine for this or is there a better boot loader for this scenario?

Thanks
Pages: 1 ... 3 4 [5] 6 7 ... 30