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181  Using Arduino / Project Guidance / Re: Powering Uno with LiPo and solar panel on: September 27, 2013, 04:47:22 am
These types of questions cant be answered unless the power consumption of the Uno is known.
Will the Uno and the WiFi shield be running all the time , or just for a few hours a day?
182  Using Arduino / Project Guidance / Re: connecting solar panel? pv datalogger. measure voltage and current on: September 23, 2013, 01:31:42 am
What exactly is the aim of the project?
Are you trying to measure how much energy the solar panel makes over some period of time
or just how much power the solar panel makes into some random value resistor?
Ideally, to measure how much energy a solar panel can make over some time frame , you need
some kind of MPPT tracker, but thats probably not what you had in mind .
183  Using Arduino / Networking, Protocols, and Devices / Re: Looking for a simple wireless "switch" on: September 20, 2013, 06:20:02 pm
You need at the transmitting end some kind of data processing device , either an encoder or a small MCU.
As you previously indicated you had trouble sourcing the SC2262 encoders, then the next option available is
a small Micro at the transmitting end, which is what the ATTiny is for.
Its important to understand that the simple transmitter / receivers by themselves cannot simulate a hard wired link.
Also, you arnt the only person in the world who uses these simple transmitter / receivers, so you must have some way
of identifying your transmissions from any others that your receiver will pick up.
For most people who use these devices , the virtualwire library which needs to run in an Atmel based Micro and does all the hard work for you
is the easiest way.
Note that you will still need to do some basic programming of the Micros at both ends to make this work.
184  Using Arduino / Motors, Mechanics, and Power / Re: Driving a Car Alternator as a Motor on: September 20, 2013, 02:21:52 am
Car alternators are 3 phase with a full wave diode bridge to produce the DC.
The only way to run one as a motor is to supply 3 phase AC at whatever frequency you want the motor to run at.
Its possible but a lot of work, and needs specialised electronics.
185  Using Arduino / Networking, Protocols, and Devices / Re: Looking for a simple wireless "switch" on: September 19, 2013, 08:13:43 pm
If sourcing the encoder / decoder chips is difficult, then you can use something like an ATtiny at the transmitting end.
You will need to use the Virtualwire library at both ends to handle the data encoding for the Transmitter and Receiver.
https://www.sparkfun.com/products/10532
https://www.sparkfun.com/products/10534
https://www.sparkfun.com/products/9378



186  Using Arduino / Networking, Protocols, and Devices / Re: Looking for a simple wireless "switch" on: September 18, 2013, 06:27:46 pm
Use an SC2262 encoder at the push button end, and a SC2272 decoder at the Arduino.
These devices are designed for the transmitting of momentary information and can handle 4 bits, ie
setting 1 or more bits high or low at the transmitting end , causes the equivalent bits at the receiving end to change.
You also need a cheap transmitter and receiver.
187  Using Arduino / Project Guidance / Re: Lithium Battery Management System on: September 18, 2013, 12:27:12 am
Heres an IC specifically designed for managing 12 series LIPO batteries for the EV market.
http://www.intersil.com/content/dam/Intersil/documents/isl7/isl78600.01_product_brief_hr.pdf
If you really want to do this , then its best to use electronics specifically designed for the purpose.
Theres a lot of energy in a series LIPO battery string, and you sure dont want anything to go wrong.
As Grumpy_Mike has indicated, this is not a beginners project.
188  Using Arduino / Project Guidance / Re: Lithium Battery Management System on: September 17, 2013, 04:29:27 am
Your question is a bit vague.
If you are going to have 11 battery packs in series , why do you just want to measure one of them.
You will need to measure them all , and thats a far bigger exercise than just measuring one.
Can you explain a bit more about the project.
189  Using Arduino / Sensors / Re: Wind Speed and Direction Sensor on: September 15, 2013, 12:52:26 am
Be careful buying el cheapo anemometers off the net .
Many will not come with any calibration data which means that you wont know what the relationship between spin rate and the wind speed actually is.
190  Using Arduino / General Electronics / Re: CT Clamp and AC to DC on: September 15, 2013, 12:45:16 am
How accurate do you want the result to be?
CT type power measurements arnt very accurate because they assume the supply voltage never varies
which is almost never the case.
191  Using Arduino / Motors, Mechanics, and Power / Re: Can 12v 100mA solar panel run the Arduino and one question about Li-Ion battery on: September 13, 2013, 08:08:13 pm
In order to make a project like this work off Solar, its critical that you know the maximum daily total energy consumption.
So you need to determine how much power the Arduino uses and how much power the water pump will use per day.
Based on that its possible to determine whether the Solar panels are sufficient or not.
The water pump will most likley be the biggest energy consumer.

With any kind of Solar powered project, sizing the Solar Panels is the last thing you do after determining the projects total daily
energy consumption.

192  Using Arduino / General Electronics / Re: Voltage regulator help on: September 13, 2013, 07:15:48 pm
Buck converters are strange things to many people.
Heres a good simple explanation of how they work.
http://www.ecircuitcenter.com/Circuits/smps_buck/smps_buck.htm

And yes, the Inductor is a critical part of the converter.
So is the catch diode which you cant see because its inside the IC
193  Using Arduino / Sensors / Re: is there anyway to make smaller antenna for FPV system ? on: September 13, 2013, 04:18:07 am
Its not possible to make the antenna smaller without adversly affecting the range.
Depends on how far you want to transmit.
194  Using Arduino / Motors, Mechanics, and Power / Re: Induction Motor Control through PWN of arduino on: September 07, 2013, 07:28:55 am
Not possible with PWM.
You can vary the speed of a 3 phase induction motor with a VFD (variable speed drive) that you control with the Arduino.
If its a single phase capacitor start induction motor, you cant vary the speed at all.
195  Using Arduino / Networking, Protocols, and Devices / Re: 433 RF question. on: September 05, 2013, 06:20:16 pm
If you dont want to use 2 mcus, its possible to use dedicated hardware such as SC2262,SC2272 encoder / decoder chips
with those radios to send simple 4 bit logic states from one location to another.
This method is designed for applications where a simple button press is all thats needed, and the decoding process is slow.
Can take a few 100 ms to decode the data.

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