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181  Using Arduino / General Electronics / Re: Lithium backpack on: December 11, 2013, 07:30:29 am
182  Using Arduino / Project Guidance / Re: 12V Sources? on: December 08, 2013, 09:38:14 am
No, MOSFET alone was not able to bump up the voltage from 5v -> 12v.
You need the DC DC step up converter like this

183  Using Arduino / General Electronics / Re: beginner resistor question on: December 05, 2013, 05:59:04 am
End result is the data pins need to have correct voltage to signal the charge, you can use other way to generate the voltage but resistors voltage dividers is the cheaper.
184  Using Arduino / Project Guidance / Re: DS1307 problem and DS3231 on: December 05, 2013, 05:29:35 am
The I2C 'DS3231' interface is very straight forward and
   virtually identical to the register addresses of the popular DS1337
   and DS1307 RTCs, which means that existing code for the Arduino,
   Basic Stamp, Cubloc, and other controllers should work with no modification.
185  Using Arduino / Project Guidance / Re: 2 ext power sources one pot on: December 05, 2013, 05:24:45 am
 "A picture is worth a thousand words" Please show us how you connect all the staff,
and please read this,148850.0.html
186  Using Arduino / Project Guidance / Re: Arduino Microcontroller to control light bulbs on: December 03, 2013, 10:04:01 pm
If you like to control AC 120/230V lamps, then this circuit using the glued LED/LDR combination to control the Triac, PWM the LED to control the brightness, the speed, and the variation for the overall system. But this is nosy circuit have a lot of EMI.
187  Using Arduino / Project Guidance / Re: How does my wiring look? on: December 03, 2013, 09:26:16 pm
You connected the 8.4V to Arduino Uno input pin, the Atmega 328 will gone in no time, and if you press the pushbutton, you will short the positive and negative of the 2 lipos in series, the battery will blow up.
188  Using Arduino / Project Guidance / Re: Postion Tracking on: December 03, 2013, 10:48:08 am
It is possible to calculate your position by using an accelerometer. This requires some math; Acceleration integrated is velocity, velocity integrated is position. Thus if you integrate your input signal twice from the accelerometer you'd get position. Bare in mind though that integration is somewhat error sensitive. If your accelerometer would give a normally distributed error (overestimates and underestimates equally), you should have a decent positioning. However, if it tends to underestimate or overestimate, you could get large errors. There will probably be a lot of error with using the accelerations, you probably will only be able to do that for short distances. Also what if you are on a hill? Turning around would seem like acceleration. I guess you could write code to figure that out but it won't be perfect.
I haven't tried it myself yet though...

There is an entire practice around this question.  SLAM or Simultaneous Location And Mapping ( ) is the practice of identifying where you are within an environment, and mapping it for future use.

189  Using Arduino / Project Guidance / Re: First project on: December 03, 2013, 03:12:18 am
For your reference
190  Using Arduino / Project Guidance / Re: ATmega328-AU vs ATmega328P on: December 02, 2013, 05:02:05 am
Short answer
ATmega328-AU  -  surface-mount device, so if you damages it, not easy to change it. have two more analog pins A6 & A7
ATmega328P   - DIP dual in-line packages, so if you damages it, you can get a new one to change it.

ATMega16U2 and ATMega8U2 these are for USB interface to upload your sketch. one have 16KB flash and other have 8KB .

191  Using Arduino / Project Guidance / Re: Reading output from LEGO NXT to Arduino on: December 02, 2013, 04:44:16 am
The NXT and the Arduino can be made to talk over I2C.  In this tutorial, we setup the Arduino as an I2C slave, and the NXT as an I2C master.
192  Using Arduino / Project Guidance / Re: Float Number Calculation on: December 02, 2013, 12:50:32 am
You can used this

lat1_d=(float) lat1_d1*10+lat1_d2;

or this
lat1_d=(float) lat1_d1*10+lat1_d2;

193  Using Arduino / General Electronics / Re: 5V Regulator on: December 01, 2013, 08:49:30 pm
If you need Linear Regulator with 3A, you may try LT1085

but charging iPhone need higher then 5V, like 5.25V,

for high current like 3A, i would suggest go for a switching regulator.
194  Using Arduino / Project Guidance / Re: Arduino Uno Powers Off on: December 01, 2013, 02:15:04 am
RedBoard using LM1117 Regulator can supply 800mA, each motor draw 170mA no load, the power of the RedBoard should not off.
so you may some where have short circuit in your connection, please use multi-meter to check your connections.
or your battery is low in charge.
195  Using Arduino / Project Guidance / Re: Software Serial Question on: November 30, 2013, 11:31:35 pm
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