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1  Using Arduino / Project Guidance / Re: custom PCB on: July 17, 2014, 01:54:58 am
China shops underpricing each other, interesting.

Want the real price? I kind of know it but there is no way you or me can get it.
2  Development / Other Software Development / Re: IDE 1.0.5 doesn't work properly with wifi module on: July 16, 2014, 01:48:16 am
I have the same shield, many of them. I didn't upgrade the firmware on any of them except one that I use for testing. The original firmware (no version number) works best with a version of wifi library (no version number) that was released before arduino IDE starts including the wifi library. The 1.0.5 r2 IDE works with the latest firmware (no version number). Otherwise you don't get any connection to servers.
3  Using Arduino / Project Guidance / Re: custom PCB on: July 16, 2014, 01:40:38 am
@ CrossRoads,
OK, as an elecrow member, here i intruduce you the elecrow PCB service:
1. if you care about the price:
 the 5cmx5 cm max , 10 pcs , color free--> 9.9$
 the 5cm x 10 cm max, 10 pcs , color free--> 12.9$
 the 10 cm x 10 cm max , 10 pcs , color free --> 15.9$,
and also special for green board: 10cm x10 cm, 10 pcs, green, only 12.9$
so, as the price, elecrow is good!

2. as the Stencil service:
the Laser Cut PCB Stencil service 20$, and the Stencil service without frame 20$ too, which would reduce the shipping fee greatly for customers.
3. as the other kinds of PCB service:
 Provide the 4 layer PCB, FPC, and high-quality PCB service.

You guys seem new to me. I'll give you a try sometimes.
4  Using Arduino / Project Guidance / Re: Android tablet as keypad for RFID door entry on: July 15, 2014, 12:23:20 am
I don't know enough about android. Can you force it to enter a lock-down mode that it can't exit? Otherwise the person can close your app, browse the internet or do other things not related to a keypad. Plus it's expensive keypad. A regular keypad is no more than a couple of dollars.
5  Using Arduino / Project Guidance / Re: Guide on Arduino Uno on: July 15, 2014, 12:13:04 am
Fake it:
Just use the Arduino analog input and a known resistor with the resistor of interest, calculate the unknown value.


Good idea. Also have a table of standard resistor values in arduino so instead of saying "22.4Kohm" it will just say "22Kohm".
6  Using Arduino / Project Guidance / Re: Notification when door opens on: July 15, 2014, 12:11:07 am
What about a dedicated phone or tablet that you ONLY carry in the area and return to a shelf behind the door you exit so next time you can pick it up again? Will this solve the "how to detect proximity of YOUR phone"? If it won't work, try the bluetooth solution. Arduino only sends a message if its bluetooth is connected to your phone. But that only works with ONE phone. A bluetooth slave can't connect to multiple masters (your phones), unless you get one module for each master.
7  Using Arduino / Project Guidance / Re: custom PCB on: July 14, 2014, 11:25:59 am
CR,

I'm interested in stencils. Are they made for the entire board or can I get some small ones, each for a standard components so I can use them on separate boards? I'm still prototyping.

OP,

What's your location? There are cheaper services in US such as OSH park, not as cheap as iteadstudio but still worth considering, when you are doing pretty small boards. They charge per area, unlike iteadstudio that charges per maximal allowed area. You get 3 boards from OSH, not 5,10,20 boards. Everything is lead-free, compared to extra charge at iteadstudio.

Besides what CrossRoads said already about solder paste and surface mount, you can also use soldering iron for surface mount parts. I've just started doing that. A lot of "fun" but you need good iron and thin solder.
8  Community / Bar Sport / Re: The Cracked Pot on: July 14, 2014, 11:17:22 am
At least the cracked pot offers variable resistance...

You reminded me that I had an intro physics problem something like that. It's a tower with hole on the side. Calculate something about that hole and water flow. Variable resistance, not sure, but variable water speed, yes.
9  Community / Bar Sport / Re: Hello, its ..... here ringing you from Windows, to tell you that you have a .... on: July 14, 2014, 11:11:31 am
I'm surprised that I have not got any windows calls on any phones I have access to. It's just quiet all the time. I think my previous cell number was sold to a lot more places or a lot more times than my current one. I'm going to keep this number smiley
10  Community / Bar Sport / Re: How to make a smart watch using arduino on: July 14, 2014, 11:06:58 am
I just think it is a bit early to make this stuff as a DIYer, for those without a lot of money, time, and experience. But expect in a few years that these products become just as popular as smart phones and production of the parts becomes huge in quantity. That may spill some parts into the DIY market, like the accelerometers etc. There would be some legal issues too, unless the large companies all forget to slap patent claims all over their displays.
11  Using Arduino / Project Guidance / Re: which arduino to go in order to achieve highest data rate sending back to PC on: July 12, 2014, 10:27:54 pm
I never clocked ethernet shield speed. Since you use SPI for sensors and ethernet (SPI interface), then you are limited by SPI bus speed. I guess maybe 1 mega bits per second as the upper limit. Arduino can handle more than 16 SPI devices. No need for other chips.
12  Using Arduino / Project Guidance / Re: What is the best way to detect a stop point on a cable??? on: July 11, 2014, 01:28:40 pm
What about using the same object secured to the cable and a mechanical switch further away from the shut-off switch? This way the object on cable only moves between these two switches.
13  Using Arduino / Project Guidance / Re: Does anyone know how to change the adress of Melexis MLX90614 infrared sensor? on: July 11, 2014, 01:26:36 pm
And with a pen/masking tape or label machine carefully tag the sensor with new address. I only glanced at the data sheet. I don't fully understand whether arduino has to send 2 bytes for each write, which only needs 1 byte, and with some error checking code, or not. Also with EEPROM write, it needs to write zero first to erase and then your value. Google some arduino examples changing address. You definitely don't need any additional hardware.
14  Using Arduino / Project Guidance / Re: which arduino to go in order to achieve highest data rate sending back to PC on: July 11, 2014, 01:23:25 pm
OP,

Is your SPI device capable of generating enough data for the arduino to send at 10MB/s, assuming arduino is infinitely fast? Can you send less data or raw data (less than text data) so the PC can process it instead? Arduino has terrible data processing power. There are devices that bridge SPI and USB. Get one of those if all you want is for arduino to do some processing on the raw data. Your PC should do it.
15  Using Arduino / Project Guidance / Re: which arduino to go in order to achieve highest data rate sending back to PC on: July 11, 2014, 01:18:20 pm

I have no idea what might be possible with Wifi.

...R

Very very very slow if you use arduino official wifi shield as I do. It's around KB/s and has a nasty 90-byte limit. If you print a message over that limit, it simply won't be sent.
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