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31  Using Arduino / Project Guidance / Re: Driving multiple Solid State Relay on: July 14, 2014, 09:46:54 am
Yes, direct control from on arduino output pin will work. And yes, it will not do PWM output, just on and off control.

32  Using Arduino / Microcontrollers / Re: New 1284P format - 1284OnTop, Bobweeny? on: July 12, 2014, 11:19:23 pm
Nice, another winner.

 Except what's with the reset switch mounted under the chip, how useful will that be?  smiley-wink

33  Using Arduino / Project Guidance / Re: Momentary connection between two wires on: July 12, 2014, 11:08:15 pm
Thank you very much for the help here.  I'd like to further my understanding on this topic a little bit more.  Can you go into some more detail on the polarity and current direction with transistors and Arduino?

Thank you!

 I cannot think of a easy way to condense basic electronic and semiconductor theory into a simple posting response. There is a way to learn all that but not via an internet forum. Start reading some basic electronic theory and if a given topic or subject isn't clear ask a specific question here.

34  Topics / Robotics / Re: Why would it not accept DC jack as power supply on: July 12, 2014, 04:02:35 pm
As simple test will prove to yourself that a 9 volt transistor battery won't cut it for you project. Just take you multimeter and measure voltage between the Vin pin and ground when trying to power using the battery. Tell us what voltage you measure.

35  Using Arduino / Installation & Troubleshooting / Re: No version of Arduino will start on Windows 8.1 on: July 12, 2014, 03:36:05 pm
I had this problem for awhile too, and I think I know your problem.

Check the file location of the software. Chances are, it is in the "Documents" folder. Drag it out of the folder and into the "Downloads" Folder. I'm guessing you were using windows 7 before, and it is able to run the software when it is in the "Documents" Folder. If this doesn't work, or it was in the downloads folder already, please let me know.

Well I don't know what his problem might be, but I've been running arduino on a win 8.1/64 laptop with the IDE folder located in my Documents folder with no problem. I do run as administrator so he might check what access level he is running at.

36  Using Arduino / Microcontrollers / Re: Arduino UNO as ISP doesn't work on: July 11, 2014, 06:17:31 pm
The essayist way to program those is to swap chips its super easy and you load it just like the uno then take it out pop it in your project and done smiley

I like the sounds of this method. Once flashed with the bootloader and your sketch, will it then require an external oscillator or will the internal be used? 

It will require an external crystal or ceramic resonator as when the bootloader is burned into the chip it also burns the fuse bytes which set up what clock source to use.

 If internal, does it require calibration?  I'm trying to time some blinky project pretty specifically, and it didn't work out for me so well with the ATTiny85 as the internal oscillator required calibration, which apparently is not something I'm capable of.
37  Using Arduino / Audio / Re: Need help determining which speaker is louder on: July 11, 2014, 06:07:47 pm
Well one is rated at 2 watts max and the  other at 0.2 watts max power consumption. Neither gives what it's audio output is at their rated max power (SPL rating), but I would suspect the first can be driven louder then the second based on the very limited information given in the product descriptions.

38  Using Arduino / Microcontrollers / Re: ATMEGA 1284 - Definative Bootloader Solution.... on: July 11, 2014, 12:42:50 pm
From what I can see its a whole heap of work to go down the bootloader route....
Is it easier to just program the 1284 via ISP ??

Not really. Once a bootloader is installed it works pretty much automatically with the arduino IDE when doing normal uploading. There are two parts of that process, first the hardware that connects the USB serial converter chips DTR or RTS signal via a series capacitor that triggers a auto-reset on the 1284 which starts the bootloader and then the actual uploading of the sketch code via serial data.

 But programming via the arduino IDE's upload using programmer option under the file menu is pretty simple requiring no USB serial converter nor auto-reset circuit, but does require a 'hardware programmer' which can be one of six different kinds supported by the Arduino IDE programmer selection menu.

39  Using Arduino / Project Guidance / Re: triple pole triple throw relay on: July 11, 2014, 10:31:43 am
You need to use two relays. First a DPST where the common goes to the motor and the NC to CW and NO to CCW. The second SPST relay just switches the motor common. In your arduino you would use two digital output pins each using a switching transistor to control each relay coil. In your software one output is motor on/off and the other output is rotation direction. It would not be possible to switch on CW and CCW at the same time in error as it's a single digital output.

40  Using Arduino / General Electronics / Re: Reading voltage - Product already exists?? on: July 10, 2014, 06:09:38 pm
I think our legs are being pulled.  smiley-wink
41  Using Arduino / Installation & Troubleshooting / Re: Arduino IDE Beta 1.5.x ? on: July 10, 2014, 02:00:48 pm
If you are using a 8 bit AVR arduino board then 1.0.5r2 is the current stable release. If you are using a 32 bit arduino board then `1.5.x is what you must run and it is still in beta. Eventually they will most likely be merged into a single stable release.

42  Using Arduino / Programming Questions / Re: attachInterrupt() not working for RISING and FALLING edges. on: July 10, 2014, 01:50:05 pm
Using a steady HIGH or LOW as an interrupt trigger is almost always problematic unless the ISR is able to do something to remove the external trigger level back to it's inactive state, it just adds complexity. Change, rising, falling are the useful trigger states.

43  Using Arduino / Programming Questions / Re: Relay not activating – help please on: July 10, 2014, 10:47:58 am
Well I just stopped at the first error I see in the code. Not to say you don't also have a wiring problem but correct this first:

const int threshold = 1.5;

Integer type (int) can't have fractional parts, only whole numbers. This will effect your testing logic in software. Floating point types do allow fractional parts.
44  Using Arduino / General Electronics / Re: short time buzzer sound at constantly High. on: July 09, 2014, 08:34:47 pm
Well an arduino output pin can't switch +12vdc directly, you will have to use a switching transistor. As far as having a brief pulse of the buzzer you might try wiring a  large electrolytic capacitor in series with the buzzer. Start with maybe 470 ufd and adjust higher or lower to your requirement.

45  Using Arduino / General Electronics / Re: short time buzzer sound at constantly High. on: July 09, 2014, 07:17:42 pm
Do you have a link to your specific buzzer that we could look over?

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