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1  Using Arduino / Project Guidance / Re: Arduino based MP3 player on: Today at 12:31:29 am
If you want an event-driven MP3 player that plays certain tunes depending on what happens, then you can still use the said android tablet and slave an arduino to sense the events. You may be able to use arduino micro to send keyboard short cuts to play certain tunes (I know you can do that with windows desktop icons.)

This has been tested on win 8.1. If you set a short cut for a program to be ctrl + alt + 1, then let leo or micro send this:
Code:
      Keyboard.press(KEY_LEFT_CTRL);
      Keyboard.press(KEY_LEFT_ALT);
      Keyboard.press('1');
      delay(100);
      Keyboard.releaseAll();

Tested with minimal latency, especially when the mp3 file is already open. It works under desktop or metro.
2  Using Arduino / Project Guidance / Re: Arduino based MP3 player on: September 21, 2014, 11:27:33 pm
Something like a cheap android tablet can do:

http://www.banggood.com/CHUWI-V17HD-RK3188-Quad-Core-16GHz-7-Inch-Android-44-Tablet-p-928701.html

What exactly is an arduino doing in this project? Is it just for learning arduino?
3  Using Arduino / Project Guidance / Re: Type on keyboard and characters show up on LCD screen? on: September 21, 2014, 11:15:50 pm
The guy in the video DID use an arduino.

If you want to do the same thing, get an old PS/2 keyboard and use the library. If you want to use a USB keyboard, it's going to cost you quite a bit to get a usb host shield to do the same thing.
4  Development / Other Hardware Development / Re: How to burn the bootloader and sketches on Atmega328p-Au on: September 21, 2014, 08:34:35 pm
Maybe enough cooling will help the overclocking.
5  Using Arduino / Programming Questions / Re: Turning on multiple relays with space bar on: September 21, 2014, 01:18:13 pm
If all you are doing is controlling relays, not other stuff, try the firmata.
6  Development / Other Hardware Development / Re: Custom Arduino Board Project on: September 21, 2014, 01:07:57 pm
Not too bad if OP just started with soldering. I did a few bad ones when I was starting.

If OP wants to build a board with ATMEGA328 on it, find a board with connected traces like this one:

http://www.radioshack.com/product/index.jsp?productId=2102845

Your IC pins will have two extra pads to connect to things and you get two buses under the IC for 5V and GND.
7  Development / Other Hardware Development / Re: Arduino mini arcade cabinet on: September 21, 2014, 01:03:01 pm
So cool! I like it!
8  Development / Other Hardware Development / Re: How to burn the bootloader and sketches on Atmega328p-Au on: September 21, 2014, 12:18:27 pm
I believe the maximum speed at 3.3V is 8 Mhz.


Not according to spec sheet. You can safely go up to about 13MHz with 3.3V supply. 16MHz will be overclocking.

9  Development / Other Hardware Development / Re: Introducing WiDo - Open Source IoT Node (Arduino Compatible) on: September 20, 2014, 11:46:43 pm
Is this pin assignment correct?!?

WIFI D7 (IRQ), D5 (VBAT), D10 (CS), D14 (MISO), D15 (SCK), D16 (MOSI)
MicroSD-D4 (CS), D14 (MISO), D15 (SCK), D16 (MOSI)

This would mean conflict, and wifi and sdcard not usable in same sketch!

Where do they conflict with each other?
10  Development / Other Hardware Development / Which 16MHz crystal is used on leonardo? on: September 20, 2014, 11:42:30 pm
I am designing an ATMEGA32U4 board based on Leonardo design. The crystal used in the original design is "16MHz 3.2mm*2.4mm KX-7". I wonder what other parameters such as load capacitance and frequency ppm etc I should consider in order to pick a crystal for my design.

Here is a digikey part search link:

http://www.digikey.com/product-search/en?pv7=2&FV=fff4000d%2Cfff8016d%2C40093a%2C403193%2Cb83521%2Cb87c2d%2C1140003%2C22c0011&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

There are many crystals with various specs. Any recommendations?

Has anyone made boards with digikey crystals and can you share your part number? Thanks.
11  Using Arduino / Project Guidance / Re: Read PH device LCD on: September 20, 2014, 06:08:56 pm
Does anyone know what protocol the atlas sensors use? SDI-12?
12  Using Arduino / Project Guidance / Re: Read PH device LCD on: September 20, 2014, 04:45:45 pm
The unit with lcd seems to have no way to connect to another device for logging. There is also no information on the sensor, such as how to operate it and pin out. You may have to use their sensors without the readout unit. Google their sensors and see if you can find something useful.
13  Community / Bar Sport / Re: Lead free solder on: September 20, 2014, 12:02:55 am
I just got an architect desk lamp and LED bulbs. The bulbs are so heavy that the lamp can only stay at one position, the worst one of course. It stands tall and won't get closer to my desk without toppling over. I am in need of lead bricks.
14  Using Arduino / Microcontrollers / Re: [SOLVED] Building ATMEGA32U4 bootloader and pin 13 behavior on: September 19, 2014, 09:10:27 am
Combining Caterina.hex and blink.hex also worked. Now I have removed control of the TXLED, RXLED, and L_LED pins from the bootloader, increasing the usable pin amount by 3 (have to define TXLED pin to be D30).

Many thanks to hiduino!
15  Using Arduino / Microcontrollers / Re: Building ATMEGA32U4 bootloader and pin 13 behavior on: September 18, 2014, 09:49:09 am
Update:

Using the solution I provided above (link to a file to replace mysys-1.0.dll) and compiling in command line prompt cmd.exe under c:\system\SysWOW64\ worked. When I was compiling earlier, I was using cmd.exe in c:\system\System32. The two are different. I was using this one in win 7 but it worked without the .dll replacement. It must be the difference between win 8.1 and win 7/8. I spent a large part of the evening fighting this problem and didn't have time to compare the complied binary with the one I compiled in win7.
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