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1  Using Arduino / Project Guidance / Re: Using H-bridge on: September 25, 2014, 06:34:38 am
I use dual H-bridge (aka 'full' h bridge) ?

Which  dual H-bridge that you used? do you have link to this  dual H-bridge ?
2  Using Arduino / Project Guidance / Re: How to configure a 4 hourly timer on: September 25, 2014, 06:21:51 am
have you read this
http://forum.arduino.cc/index.php?topic=223286.0
3  Using Arduino / Project Guidance / Re: PSTN/MODEM IC - Talk over Phone Line on: September 23, 2014, 07:43:14 am
IC
http://www.lsi.com/products/personal-connectivity/pages/data-modems.aspx#tab/tab1
Modules
http://www.cermetek.com/Catalog/High-Speed-Modems/
4  Using Arduino / Project Guidance / Re: RTC DS1307/IN1307 - Very innacurate time on: September 18, 2014, 08:29:30 am
The datasheets for the crystals I bought said specifically *not* to do that.  The heat of soldering can crack the crystal.
5  Using Arduino / Project Guidance / Re: RTC DS1307/IN1307 - Very innacurate time on: September 18, 2014, 08:16:42 am
Read this,
Quote
with some coding that improves accuracy from (typically) 5 - 10 seconds lost per day to maybe a couple of seconds a week or better.
http://forum.arduino.cc/index.php?topic=87846.msg686532#msg686532
6  Using Arduino / Project Guidance / Re: How to increase piezeo speaker range? on: September 10, 2014, 05:40:38 am
You may try Tweeter Speakers System like this with high power amplifier.
7  Using Arduino / Project Guidance / Re: Need a help. on: September 08, 2014, 07:21:21 am
Base on the datasheet, it have three pins, one is +5V another is Gnd, and the out is analog voltage from 1.2V to 3V
you can start using this code, attach the out pin to pin A0

Humidity output signal : (25 , 60% RH, the input voltage = 5V) Humidity 20 % 30 % 40 % 50 % 60 % 70 % 80 % 90 % 95% voltage V 1.25 1.50 1.80 2.00 2.20 2.40 2.57 2.75 2.82

 
Code:
/*
  AnalogReadSerial
  Reads an analog input on pin 0, prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
 
 This example code is in the public domain.
 */

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // print out the value you read:
  Serial.println(sensorValue);
  delay(1);        // delay in between reads for stability
}
8  Using Arduino / Project Guidance / Re: Need a help. on: September 08, 2014, 07:10:01 am
Please don't cross post.

http://forum.arduino.cc/index.php?topic=265592.msg1872872#msg1872872
http://forum.arduino.cc/index.php?topic=265635.msg1873198#msg1873198
9  Using Arduino / Project Guidance / Re: 5W or 10W Led Driver for RGB on: September 07, 2014, 10:53:38 am
You also can use PWM hardware IC.
For example, something like the TLC5940 offers 16 channel PWM control.
http://playground.arduino.cc/learning/TLC5940
10  Using Arduino / General Electronics / Re: DC DC inverter couple of questions on: September 07, 2014, 01:33:13 am
But with this DC-DC converter, you still need the High voltage coil.
look at the right side of the schematic, it connect to coil.
11  Using Arduino / Project Guidance / Re: 5W or 10W Led Driver for RGB on: September 06, 2014, 07:03:35 pm
3) ill look at both if you give me the names to look for for my specific need, keep in mind they are going to be flashing most of the time not steady burn
4) only  1/2 dim and 1/4 dim upon a push button input

When you said you need the LED flashing and dim, in arduino you have to used PWM, AnalogWrite() function.

With  AMC7135  you don't need MOSFET, you can control using Arduino digital out pin directly like this

This circuit show using 3 AMC7135 for higher current of about 1A, you don't need that you will driving it only 300mA.
12  Using Arduino / Project Guidance / Re: 5W or 10W Led Driver for RGB on: September 06, 2014, 07:53:07 am
You can go for this AMC7135 350mA Advanced Current Regulators if you can handle SMD, you can get 100 pcs for about US$11 at Here

This is how you can use it for higher voltage


You can control the VDD pin with P -channel MOSFET Arduino digital out pin directly for PWM
13  Using Arduino / Project Guidance / Re: Sett output pin to high Impedance mode on: September 03, 2014, 06:38:05 am
set the pin as an input to turn the LED off,

That is the correct way and more logical way.
14  Using Arduino / Project Guidance / Re: use arduino to control an adjustable boost converter? on: August 31, 2014, 09:50:55 pm
If you have fix resistance of your vaporizer heat up coils (0.6 Ohms), you do not need to have adjustable boost converter.

P = R x I2 and you have  P = > 50W , R = 0.6 Ohms, all you need is to adjustable current.

If your battery have 8.4V  with 0.6 Ohms , if will have max of 14A current, you just need to control the current with the PWM and logic level MOSFET with Arduino will do.
15  Using Arduino / Project Guidance / Re: First project: too much choice. on: August 28, 2014, 05:18:32 am
I recommend Pololu Zumo Robot for Arduino

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