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121  Using Arduino / Project Guidance / Re: Large Radio Network ? on: February 21, 2014, 04:55:23 pm
Powering the radios could be a problem, depending on how long you want the batteries to last.
If the radios have to be listening all the time, that represents a sizeable power component.
What sort of batteries are you going to use.
122  Using Arduino / Sensors / Re: Solar Radiation Sensor By Campbell Scientific on: February 21, 2014, 02:01:16 am
From the information about the Sensor, its impossible to tell.
You really need to contact the manufacturer and get better specs on the output data format.
123  Using Arduino / Project Guidance / Re: DHT22 (or equivalent) over long distance. on: February 21, 2014, 01:57:20 am
The DHT22 needs a dedicated data line for each sensor.
You cant have multiple sensors on the same data line.
The maximum recommended line length is 30M.
124  Using Arduino / Motors, Mechanics, and Power / Re: Balancing Batteries on: February 20, 2014, 05:24:52 pm
Voltage regulators in parallel wont current share, and can oscillate uncontrollably..
The only way you can make such an arrangement work, is to disable the voltage sensing from one of the regulators
and connect the sense voltage to the other via a summing network.
But its just not good practice.
125  Using Arduino / Networking, Protocols, and Devices / Re: newbie question on interfacing with a mobile phone. on: February 15, 2014, 10:29:06 pm
The issue is how are you going to connect the Mobile phone to the Arduino?
Most mobile phones only have a USB connector designed to connect the phone to a computer.
To connect a USB device like a phone to an Arduino, you need a USB host shield for the Arduino.
But this only allows the phone to be connected.
You then have to somehow get the Arduino to recognise the phone so you can talk to it.
Its far easier to junk the mobile phone and use an Arduino GSM shield.
Why do you want to use a mobile phone?
126  Using Arduino / Networking, Protocols, and Devices / Re: newbie question on interfacing with a mobile phone. on: February 15, 2014, 06:49:22 pm
What kind of mobile phone are you using.
Does it have a serial port?
Most mobile phones usually only have a USB port, and need a custom driver for whatever they are being connected too.
127  Using Arduino / Networking, Protocols, and Devices / Re: newbie question on interfacing with a mobile phone. on: February 14, 2014, 05:21:43 pm
Your questions make no sense .
What are you trying to achieve here?
You will need as a minimum as Arduino with a GSM shield to be able to receive SMS messages.
What do you want the Arduino to do ?

How you create them is another matter altogether and probably beyond the scope of this forum.
128  Using Arduino / Motors, Mechanics, and Power / Re: Helicopter experiment on: February 14, 2014, 01:16:26 am
The most critical design parameter for a helicopter is its weight.
Without knowing that , its impossible to know what motors will be needed.
129  Using Arduino / Networking, Protocols, and Devices / Re: 433 MHz RF module increasing range on: February 08, 2014, 11:28:54 pm
There are many versions of those low power 433 modules.
The cheapest versions are only 1 mw and what you are seeing is pretty typical.
To get better range you will need either the 12 or 25 mw versions, which are claimed to be good for 1000m
You can improve the range also by soldering a proper SMA connector to the modules and connecting a better
antenna.
130  Topics / Home Automation and Networked Objects / Re: How to build a wireless camera system with Arduino? on: February 07, 2014, 02:13:36 am
What kind of webcam?
If its a USB Webcam , then its not possible to do with Arduino as the USB data rate is too fast.

131  Using Arduino / Project Guidance / Re: making a Reciever on: February 05, 2014, 10:41:41 pm
Building your own Radio receivers, other than a simple crystal set, is simply not a practical proposition for anyone
other than an experianced RF designer.
The design calculations alone will swamp anyone , let alone actually building the circuitry.
Its best to simply buy the hardware already assembled and treat it as a module which does all the hard work
and all you need to do is feed data in and get data out.
132  Using Arduino / Networking, Protocols, and Devices / Re: What rf to use? on: February 04, 2014, 05:16:19 pm
You can use Xbees without an antenna, but the range will be very limited, 10 metres or less.
To get any decent range, you will need a good external antenna.
133  Using Arduino / General Electronics / Re: suggest me a good Power Supply and solar panels question on: January 29, 2014, 04:23:14 pm
Its very hard to answer your questions without knowing what you are going to use the Arduino for, as this determines how much power it uses, and this determines whether its feasable to use solar panels to power it.
Even with Solar panels , you will still need a battery of some kind.
Will the Solar panels be outside in the sun?
How many sun hours per day do you get.
This is related to your latitude.
134  Using Arduino / Project Guidance / Re: dual axis solar tracker for mobile/portable installation of solar panels on: January 28, 2014, 07:36:13 am
The fundamental problem with small wind turbines, which are the type that might be used in camping or erected on a short pole
is the swept area is simply too small to gather any usuable wind , unless the wind speeds are 40 kmh + .
As the power in wind is proportional to the cube of the wind speed, small drops in the wind mean really large drops in output power.
A good example is a popular small wind turbine called an Air X 400, which is a small 400 watt turbine with a rotor diameter of 1.5 Metres.
To get 400 watts , you need a wind speed of 45 kmh, and because of the cubed law, at half the speed you get 50 watts.
Ok if you live somewhere near the coast where the wind is always blowing a gale.
Then there is the cost, and small wind turbines are very expensive relative to the power they make.
You are much better off with Solar panels for the same cost.

135  Using Arduino / Project Guidance / Re: dual axis solar tracker for mobile/portable installation of solar panels on: January 27, 2014, 06:29:46 pm
Before you even think about any kind of vertical axis wind turbine , make sure you examine closely the
power output versus wind speed for the turbine you are considering.
All VAWTs fall into 2 categories.
They are either a Savonious rotor design, which are fairly common , but extremely inefficient as they are a drag rotor and need
hi wind speeds to make any usuable amount of power.
The other type is a Darrieus vane which do work well, but are extremely large and need very substantial mounting structures, so are not viable for most people.
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