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1  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.
2  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

3  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
4  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.
5  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
6  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.
7  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.
8  Using Arduino / Project Guidance / Re: RFID based Water ATM project on: August 18, 2014, 06:29:02 am
the "reset function at 0" certainly starts the code back at the very beginning, but it doesn't reset any of the things that are reset by a power-on...,12874.0.html

And if you read the rest of that thread you'd see why jumping to address 0 is not really a reset and not recommended.

All that does is start the code over, it doesn't reset the chip - an important distinction.
9  Using Arduino / Project Guidance / Re: I'm really new at this I need some help on: August 17, 2014, 11:50:57 am
You can control the relay by Bluetooth.
10  Using Arduino / Project Guidance / Re: TLC5925 LED clock on: August 16, 2014, 10:02:43 pm

At the bottom where it says "Links" there is no link (that works).
I can't find the code or a usable schematic. All I can find is lots of photos of the clock.
The links work, it link to Google Doc. to clock.rar had all the files "Eagle files, HEX  & Arduino code + script for LED placement & rotation"
11  Using Arduino / Project Guidance / Re: Multicontroller on: August 14, 2014, 07:07:34 am
This Multicontroller using PIC 18F2520
12  Using Arduino / Project Guidance / Re: how to activate pwm pins in arduino duemilanove atmega328 on: August 12, 2014, 06:24:16 am
Base on ken shirriff's "A Multi-Protocol Infrared Remote Library for the Arduino"

How to send
This infrared remote library consists of two parts: IRsend transmits IR remote packets, while IRrecv receives and decodes an IR message. IRsend uses an infrared LED connected to output pin 3. To send a message, call the send method for the desired protocol with the data to send and the number of bits to send. The examples/IRsendDemo sketch provides a simple example of how to send codes:

#include <IRremote.h>
IRsend irsend;

void setup()

void loop() {
  if ( != -1) {
    for (int i = 0; i < 3; i++) {
      irsend.sendSony(0xa90, 12); // Sony TV power code

Have you try it? what was the out come?
13  Community / Gigs and Collaborations / Re: Arduino Timer/Clock on: August 11, 2014, 04:50:38 pm
No, not able to drive by turn on/off of supply.
you can use this Buzzer
14  Using Arduino / General Electronics / Re: what's this phenomenon called? on: August 11, 2014, 03:30:09 am
But when you use ground between the 2 voltages we get a voltage shift, anyone know the name of this?

Bipolar Power Supplies
15  Using Arduino / General Electronics / Re: High current Measuring sensor on: August 11, 2014, 02:51:50 am
You can use HCPL-7520 linear optoisolator in circuit to isolate the high voltage.
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