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31  Topics / Home Automation and Networked Objects / Re: arduino android application on: August 08, 2014, 10:43:43 am
What is the easiest way to monitor the uno through the android ??

HC-05 bluetooth - $7- is probably the simplest. You send the data in exactly the same way you would send it to the serial monitor. Use BlueTerm on Android
32  Using Arduino / Project Guidance / Re: Can i put a 9V battery on VIN pin? on: August 07, 2014, 11:02:16 pm
   So are you saying that there is a risk of burning the arduino board or something?   

No risk so long as you are sensible about the connection, and nothing wrong with using it either.  Kind for kind,  the grunt of a battery is more or less reflected by its volume, so 6xAAs trumps a 9v and 6xDs puts you on a (short) road to glory.
33  Using Arduino / Project Guidance / Re: Can i put a 9V battery on VIN pin? on: August 07, 2014, 06:38:32 pm
Yes, but read reply #1 again.
I guess a 9v battery is useful for confirming that another power source is causing you problems, and using the VIN pin is an appropriate measure.
34  Using Arduino / Displays / Re: Fix LCD flickering problem - Nokia 5110 on: August 06, 2014, 11:42:21 am
, it is necessary to connect SDIN and SCLK pins to Arduino's MOSI and SCK pins, in't it?

No.
35  Using Arduino / Sensors / Re: Transmitting the output data of my TMP 36 Sensor to my mobile? on: August 06, 2014, 09:27:27 am
If you are less than 10m from the Arduino. A bluetooth module may suffice.
If you are on holiday in Acapulco, it probably won't, and a GSM shield is probably in order.
36  Using Arduino / Sensors / Re: Help with PT 500 Sensor on: August 06, 2014, 09:24:01 am
The problem may be down to difficulty in measuring. It is common to amplify the signal first.

http://openenergymonitor.org/emon/buildingblocks/rtd-temperature-sensing
37  Using Arduino / Displays / Re: Fix LCD flickering problem - Nokia 5110 on: August 06, 2014, 09:09:27 am
Maybe, because I have connected digital wires using 10k resistors without any level shifter,

And maybe not. Irrespective of whether it is a good idea or not, that is a fixed situation, whereas you have a varying problem.

Quote
A1 pin used to adjust brightness

Probably something you don't need, and possibly the cause of the problem. If you are referring to the brightness of the LEDs, you might question whether you need the LEDs at all. This particularly applies of you have blue LEDs.

Quote
Also I'm going to visit local store to see if any level shifter is in stock.

I don't think you need any level shifters, you can just run it off the 3.3v pin.
38  Using Arduino / Displays / Re: Fix LCD flickering problem - Nokia 5110 on: August 06, 2014, 03:12:36 am
Proably bad wiring. I notice something unusual on pin A1. If it is the display that is flickering, this might have something to do with it. It is also possible that 5110 cannot handle the data feed rate.  At the moment you are reading and sending data about 50 times a second. Even if 5110 can handle that, I bet you can't, so it might be time to reconsider. You may find that loop cycle is actually down to the 5110, and that can't possibly be a good idea.

You might consider using a library instead of wading though all that stuff. I use the Philips PCD8544, but I think the Henning Karlsen might be better.

You also might consider what you are doing rather than what you merely intend to do. Writing
Code:
#include <SPI.h> // We'll use SPI to transfer  data. Faster!
doesn't mean you are actually using SPI.

39  Using Arduino / Networking, Protocols, and Devices / Re: Problem displaying data on serial monitor on: August 05, 2014, 09:59:27 pm
I had to reboot my computer and close down the Arduino IDE multiple times because the port it wanted was "In use". 

This is a chronic problem and just as likely to happen with Megas and Unos. You should not have to reboot the computer, just closing down all your Arduino stuff should suffice.

It's just something you get used to..........
40  Using Arduino / Networking, Protocols, and Devices / Re: Controlling Arduino with iPhone on: August 04, 2014, 10:32:05 pm
I'm afraid a WiFI router will kill battery life.

This might not help you much unless you ditch the iPhone.

The plain-vanilla HC-0x Bluetooth isn't famous for being frugal either, but it is possible that the on-board LED is the real villain. If you get the module and JY-MCU backboard separately and assemble them yourself, you can omit the LED by simply not soldering the connection.  This might make a a significant difference
41  Using Arduino / Interfacing w/ Software on the Computer / Re: Turn Serial Monitor Data into Graph? on: August 04, 2014, 07:08:08 pm
more advanced for several values with different colors..

The simplest way of doing that would have to be by sending it direct to Excel. You can do this with PLX-DAQ, which is a macro that effectively makes Excel into a live terminal.

Live update, several values, several colours

and it's free!

All the graph setup is done in Excel and is thus as comprehensive as any other Excel graph. (What more could you ask for?)

http://www.parallax.com/tabid/393/default.aspx
42  Using Arduino / Project Guidance / Re: Clarification on power source(s)? on: August 04, 2014, 12:55:48 am
The whole circus depends on the servo, about which you say nothing.

It doesn't matter how big the power supply is, each I/O pin on the Uno is still only good for 40mA. If the servo demands ten times that, remember where you heard it first. It is commonplace to have a separate power supply for servos and, If by bunch you really mean a lot of LEDs, you might use it to power those too.
43  Using Arduino / Project Guidance / Re: Help with one wire temperature sensor project on: August 03, 2014, 07:05:54 pm
Thermistor1 and thermistor1 are not the same variable. Since the sensors are returning floats you might find it helps to use 78.00 in the if statements. The code you post is verbose and ill-considered, but works OK, so I assume the only problems are with the conditionals.
44  Using Arduino / Networking, Protocols, and Devices / Re: how to use serial monitor with HC-05 bluetooth module? on: August 03, 2014, 06:01:36 pm
Your post is incomprehensible, and so is the objective, but you could be using the wrong software for what you want to do.
If you need to use the serial monitor simultaneously with bluetooth, you need to have them on different ports. With a Uno, this means you are obliged to run Bluetooth on software serial.
45  Using Arduino / Networking, Protocols, and Devices / Re: Bluetooth module drawing a bit too much power? on: August 03, 2014, 05:54:51 pm
I'm playing with an HC-05 module, and measured that it draws 60-70ma when idle or active.
Does this seems a bit too much since this is a bluetooth class 2.0 dongle with 2.5mw output at the antenna?

It could mean bad measurement. The HC-0x isn't famous for low power consumption but I think it runs at 8mA with up to 40mA
when active. I imagine most of the power is taken by the LED. If power is perceived as a problem, you could get a bare module and omit the connection to the LED.

Quote
Probably better to feed it from a separate power feed, rather than directly from 5v+ pin on the Arduino?

No.
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