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1  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.
2  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

  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:

// 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:
  delay(1);        // delay in between reads for stability
3  Using Arduino / Project Guidance / Re: Need a help. on: September 08, 2014, 07:10:01 am
Please don't cross post.
4  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.
5  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.
6  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.
7  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
8  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.
9  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.
10  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

11  Using Arduino / Project Guidance / Re: Battery powered DC lab bench power supply controlled by arduion on: August 26, 2014, 08:38:01 am
Take a look how people go around the voltage limit of the digital pot.
Building a Small Programmable Power Supply using LM2596
12  Using Arduino / Project Guidance / Re: RFC: 16-bit Address Debugger on: August 25, 2014, 07:40:05 am
Don't connect pin21 AREF pin to 5V, have to be leave open and decoupled by an external capacitor 0.1uF to improve noise immunity.
Otherwise, you will short together the active reference voltage (internally generated) and the AREF pin, possibly damaging the microcontroller.

You can control the back light of the LCD with a transistor.
13  Using Arduino / General Electronics / Re: Make HC SR04 water resistant on: August 20, 2014, 08:49:11 am
Change to ultrasonic sensors to this type
14  Using Arduino / Project Guidance / Re: reset program using watchdog timer on: August 20, 2014, 07:53:42 am

Well the arduino uno has a WDT compatible bootloader (some bootloaders don't handle WDT interrupts so can get hung up if the timeout value is too short) so the main pertinent steps will be

1. Reset the WDT so it can't generate further interrupts
2. Wait to see if the IDE is requesting to upload a new sketch, and if not then
3. Jump to the sketch code which should
4. Initialize timer 0 properly so the millis() function will work.
5. Start the setup function of the user sketch.

There are other little details of course as the bootloader user digital pin 13 to blink the led and has to set it up as an output and then later set it back to a input, etc.
15  Using Arduino / Project Guidance / Re: Project help on: August 20, 2014, 05:54:52 am
Have you read this page
You can change the freq for the PWM

What sort of voltage, current are you looking for?
Use a proper switching mode DC-DC SMPS IC that is what they were designed for.
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