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196  Using Arduino / Project Guidance / Re: The simplest way to amplify a guitar signal on: June 20, 2013, 09:05:25 pm
What kind of guitar is it ?
The output that you will get depends on what kind of pickup the guitar is using.
Is it an electric guitar or an acoustic guitar as if its the latter, it will use a magnetic pickup
which depending on whether its a passive or active pickup could have a low output voltage
in the millivolt range.
197  Using Arduino / Sensors / Re: Weather Station on: June 14, 2013, 07:37:59 pm
Without knowing anything about the Sensor, the project will be very difficult unless you can determine
what the data format is.
Proprietary sensors are a pain unless you have some kind of ability to display the data format and decode it.
198  Using Arduino / Project Guidance / Re: Making my keyboard wireless on: June 14, 2013, 06:44:02 pm
You can do what you want, but its not cheap.
You need a wireless USB extender like the one below.
The reasons these devices are expensive is that extending USB over wireless is a very hard thing to do
mainly due to the tight timing requirements that USB has.
199  Using Arduino / Project Guidance / Re: Connect wireless alarm sensors to computer on: June 14, 2013, 06:38:02 pm
The answer is yes and no.
If you buy commercial premade alarm sensors, then you will have to do the work to figure out how to decode
the data from them.
Its possible, but a lot of work.
If you use your own sensors, then you get to define what data the sensors will send so its a lot easier to decode them.
200  Using Arduino / General Electronics / Re: Power meter on: June 12, 2013, 06:56:19 pm
What kind of power meter are you trying to make.
What are you intending to measure with the power meter.
Measuring power is not a trivial exercise if you want accurate power readings especially if the loads being measured
contain switch mode power supplies.

201  Using Arduino / General Electronics / Re: What module I can use for VHF Range between 135MHz and 175MHz on: June 11, 2013, 06:50:18 pm
Do you know the modulation type of the data being transmitted.
The module you have selected is a NBFM receiver.
It will only work is the transmitter is also using NBFM to send the data.
202  Using Arduino / Project Guidance / Re: RF 433mhz. Missing antenna? (lots of junk receiving) on: June 10, 2013, 04:00:59 am
Garbage data is normal for those cheap ASK receivers.
They have no squelch, so in the absence of any signals they simply output broadband noise.
Your receiving code has to identify the valid signals whilst ignoring the junk.
203  Using Arduino / Motors, Mechanics, and Power / Re: Advice seeked to find a LiPo cell with short length (< 7 cm) on: June 04, 2013, 07:07:25 pm
This is about the closest I could find.
To go smaller, you would have to reduce the battery capacity.
Note that you have to use a LIPO balance charger to charge these batteries if used over a long time frame.
204  Using Arduino / Project Guidance / Re: Reading 433MHz square wave signal. With Arduino Micro on: June 04, 2013, 06:53:52 pm
Just use a pair of these chips , SC2262 encoder, SC2272 decoder and connect the output of the decoder to the Arduino.
Does all the hard work for you.
SC2262 are specifically designed for small transmitters like key fobs.
205  Using Arduino / General Electronics / Re: Receiver's Noice Input =K*T*BWeq ? on: June 02, 2013, 10:39:11 pm
What are you trying to measure .
Measuring the noise input to a receiver isnt a very useful measurement , unless you know
the IF bandwidth of the receiver, as this tells you the signal to noise ratio of the signal at the
receivers detector.
This is generally what most people need to know, as it defines the minimum signal input to the receiver
thats needed to decode a wanted type of modulation.
206  Using Arduino / Project Guidance / Re: Distance sensor on a helicopter toy on: June 01, 2013, 01:43:27 am
Without knowing how the helicopter is controlled, what capacity it has to lift extra weight etc,
its impossible to answer your questions.
207  Using Arduino / Project Guidance / Re: 433Mhz Receiver AND Piezzo Buzzer on: May 27, 2013, 02:30:45 am
What is the receiver supposed to be receiving?
Not possible to even guess what may be wrong.
208  Using Arduino / Motors, Mechanics, and Power / Re: best way to control city water pressure valves on: May 26, 2013, 06:46:44 pm
Solenoid type water valves need a minimum water pressure to work.
If you dont have enough pressure, the valve will never turn on.
Its likley that adding a pressure reducer before the valve will simply mean that the valve wont turn on.
209  Using Arduino / Motors, Mechanics, and Power / Re: best way to control city water pressure valves on: May 24, 2013, 06:28:37 pm
If you are using solenoid type water valves, commonly used in things like washing machines and dishwashers,
the valves are very reliable , and fail safe in the sense that the water pressure keeps the valve off with no power applied to the solenoid.
You only need to make sure that your controlling circuit cant fail in a manner that keeps the valve energised.

210  Using Arduino / General Electronics / Re: Determining right way to drive a polarized speaker. on: May 24, 2013, 06:20:43 pm
Speakers arnt polarized.
They work on AC.
However most speakers do have some kind of mark on one of the terminals to allow multiple speakers of the same kind
to be connected in phase when stereo sound is needed.
The mark indicates which way the speaker cone moves for current thru the voice coil in a particular direction.
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