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1  Using Arduino / Project Guidance / Re: A really cool LED matrix display - can be a killer dissplay+serial communication on: October 11, 2013, 11:47:13 am
Thank you!
2  Using Arduino / Project Guidance / Re: A really cool LED matrix display - can be a killer dissplay+serial communication on: October 11, 2013, 12:23:23 am
The display has a micro usb port. That connects to one side of the Prolific USB-Serial adapter with a USB cable. The other side of the Prolific adapter has a standard male USB which connects directly to the PC.

So I was thinking that the output of Prolific adapter is actually a serial connection "masked" in a USB cable.
3  Using Arduino / Project Guidance / Re: A really cool LED matrix display - can be a killer dissplay+serial communication on: October 10, 2013, 05:37:46 pm
You can see it in action here:
http://youtu.be/f8td8t9Wbic
Some pictures:

4  Using Arduino / Project Guidance / A really cool LED matrix display - can be a killer dissplay+serial communication on: October 10, 2013, 04:34:14 pm
I got $10 "name badge" which I can connect to the computer using a USB cable and Prolific USB-serial adapter, and, using the provided software, I can have it display 120 chars scrolling message.

I used a serial monitor and figured out the protocol it is using to upload the text. Also wrote a short tool to send my own text. Now, I would like to have the Arduino send text to it using software serial.

So my question is: When I connect the Prolific adapter, I get a serial port on my PC. The cable from the adapter is a to the LED display is a USB cable. Can I assume that the D+ and D- pins in the USB cable are the serial Tx and Rx? Can I just take those two pins and connect them to my Arduino's digital pins and use the software serial library?
5  Using Arduino / Project Guidance / Re: Power Arduino Nano with USB cable from car charger on: September 17, 2013, 07:27:13 am
Ok, thank you.
6  Using Arduino / Project Guidance / Re: Power Arduino Nano with USB cable from car charger on: September 17, 2013, 04:07:31 am
Im connecting a USB cable to the Nano and don't use any analog inputs.

Was wondering if the 4.7uF and 0.1uF capacitors can filter this 0.2V ripple at around 100-500Hz
7  Using Arduino / Project Guidance / Power Arduino Nano with USB cable from car charger on: September 17, 2013, 03:37:12 am
I am powering my Arduino Nano based project through its USB port using a cheap 12V-USB car adapter.

I have two kinds, but are ebay $0.99 models.

I connected a scope to see how constant the voltage is and got mixed results. One of them shows very constant voltage with minimal noise while the other is very noisy.

My question is, what noise level can the Arduino Nano tolerate before it will cause damage and/or shorten its life?
8  Using Arduino / Project Guidance / Data compression in my code on: August 15, 2013, 07:57:49 am
I need to store a long list of GPS coordinates. I use progmem to have them in the flash. Problem is, my program takes about 16K of the memory which leaves me with only 16K to store my coordinates. Each coord is basically two floats, so I need 8 bytes for each. This lets me store only ~2000 coords. Is there a way to compress my list?
I don't know if it's relevant, but if I take my coords list and save it in notepad, and then zip the file, I get a file half the size...
9  Using Arduino / Programming Questions / Re: Is there a way to connect a USB device (like a Wifi dongle) to the Arduino? on: August 15, 2013, 07:49:38 am
I looked and looked but could not find a cheap solution.

How the hell the chinese make those USB modules so cheap?!
10  Using Arduino / Programming Questions / Re: Is there a way to connect a USB device (like a Wifi dongle) to the Arduino? on: August 14, 2013, 02:24:27 pm
I need a cheap solution for a product I am working on. It will be mass produced, so I need a cheap solution.
11  Using Arduino / Programming Questions / Re: Is there a way to connect a USB device (like a Wifi dongle) to the Arduino? on: August 13, 2013, 01:29:02 pm
So what is the cheapest way to add Wifi support to my project?
12  Using Arduino / Programming Questions / Is there a way to connect a USB device (like a Wifi dongle) to the Arduino? on: August 13, 2013, 09:18:05 am
There are many very cheap Wifi dongles selling for around $5 including shipping. I was wondering if anyone has tried to use these low cost USB Wifi adapters with the Arduino...

I am asking because I don't understand why all Wifi modules/shields for the Arduino are so expensive when you can get a fully functional Wifi adapter for a fraction of the price.
13  Using Arduino / Project Guidance / Send beeps to my bluetooth headset on: August 04, 2013, 09:48:47 am
I would like my Arduino project to send simple notifications (a simple beep in fine) to my bluetooth headset.
All BT modules I found only support serial communication and not audio.
Anyone know of BT module that can pair with a standard BT headset and let me send audio?
14  Using Arduino / Programming Questions / Re: Blink not in sync with two Arduinos. Is it supposed to be? on: July 28, 2013, 03:52:27 pm
Nick, the devices have a GPS module in them. They are both powered on at the same time and at the same location but they never lock on to the GPS signal at the same time... But I guess the problem (or behavior) is the GPS module itself since it, like the FTDI chip, has external clock.
I was wondering if it can be related to the serial communication between the atmega328 chip and the GPS module.
15  Using Arduino / Programming Questions / Re: Blink not in sync with two Arduinos. Is it supposed to be? on: July 27, 2013, 01:02:39 pm
majenko, what do you mean? The Nano has a USB FT232RL chip and there is no problem using it...
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