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31  Using Arduino / Project Guidance / Re: Arduino controlled DC-DC boost power supply on: August 05, 2014, 07:08:05 am
Look at this circuit

http://cr4.globalspec.com/thread/91098/Power-Supply-DC-DC-step-up-converter-problem

The pot will have to work with high voltage up to 80V

MCP4151 digi pots only good for about 5V and 2.5mA
32  Using Arduino / Project Guidance / Re: Low power project and batteries on: August 04, 2014, 10:09:51 am
Quote
Further tests show that if you disable the brown-out detection (by changing a fuse byte) you can greatly save power, especially in sleep mode. With brown-out detection disabled power consumption goes down to around 6 uA. This is because the brown-out detection needs an internal voltage reference to be running.
http://www.gammon.com.au/forum/?id=11149
http://gammon.com.au/forum/?id=11497
33  Using Arduino / Project Guidance / Re: Robot supply problem on: July 31, 2014, 05:45:25 am
How you connect you motors? direct supply from the battery? or supply from the 5V 7805?
34  Using Arduino / Project Guidance / Re: double IF statement? Double Conditional? on: July 30, 2014, 04:54:06 pm
Use IF statement
Code:
if ((led13State == LOW) && (analogValue > threshold))
35  Using Arduino / Programming Questions / Re: programming for LCD Module 1602, I see this error. on: July 29, 2014, 11:52:14 am
Code:
LiquidCrystal_I2C lcd (0x27, 16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display

36  Using Arduino / Programming Questions / Re: programming for LCD Module 1602, I see this error. on: July 29, 2014, 06:15:47 am
I can't figure what this is for
Code:
line display
so I'm not surprised the compiler is also having trouble.

...R

line display was part of the comment.
37  Using Arduino / Project Guidance / Re: Using intel Galileo for auto alarm clock on: July 28, 2014, 04:00:28 am
Look at this Clock


http://thekemley.blogspot.be/2012/09/arduino-led-display-clock-project-this.html

Arduino Mega will do.
38  Using Arduino / Project Guidance / Re: Controlling TRIAC using DIGITAL pot for a 220v 500w dimmer on: July 18, 2014, 07:33:34 pm


T1 conducts when the optocoupler sends a pulse to its base. C1 discharges through the collector-emitter line.
The trigger current is limited by R2 to around 40 mA.
The discharge current time of C1 is less than 1 ms.

http://www.electroschematics.com/6561/universal-triac-control-with-optocoupler/
39  Using Arduino / Project Guidance / Re: Controlling TRIAC using DIGITAL pot for a 220v 500w dimmer on: July 18, 2014, 07:43:26 am


http://forum.arduino.cc/index.php?topic%3D132141.0

http://www.instructables.com/id/Arduino-controlled-light-dimmer-The-circuit/?ALLSTEPS
40  Using Arduino / Project Guidance / Re: Flash and Fade on: July 18, 2014, 04:43:29 am
Read this
http://gammon.com.au/blink
41  Using Arduino / Project Guidance / Re: arduino and peltier on: July 16, 2014, 07:38:34 am

http://softsolder.com/2012/02/28/peltier-pwm-temperature-control-mosfet-rc-snubber/
42  Community / Gigs and Collaborations / Re: Arduino Timer/Clock on: July 16, 2014, 06:37:09 am
The code had two part, you need to copy both parts into one file.
43  Using Arduino / Project Guidance / Re: odd or "shorted" pin transistor? on: July 14, 2014, 07:26:39 pm
This how PNP transistor connect.


Edit:
I have attach your image, where is the collector and emitter of your diagram? where is your load connect?
44  Using Arduino / Project Guidance / Re: how to combinig this two coding (newbie) on: July 12, 2014, 06:35:30 pm
Take a look on this
http://forum.arduino.cc/index.php?topic=223286.0




Code:
/* This will combining two coding using Blink without Delay
*/

int E1 = 5;
int M1 = 4;

int inRelay = 8 ;
int inRelay1 = 9 ;
int inPin = 11 ;
int inLimit = 6 ;
int inLimit1 = 7 ;


int val1 ;
int val2 ;
int val3 ;

int inRelay2 = 12 ;


// Generally, you shuould use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time LED was updated

// constants won't change :
const long interval = 3000;           // interval at which to toggle (milliseconds)

// Variables will change :
int relayState = HIGH;             // relayState used to set the Relay


void setup()
{
  pinMode(inRelay, OUTPUT);  // set the digital pin as output:
  pinMode(inRelay1, OUTPUT);  // set the digital pin as output:
  pinMode(inPin, INPUT);  // set the digital pin as input:
  pinMode(inLimit, INPUT);   // set the digital pin as input:
  pinMode(inLimit1, INPUT);  // set the digital pin as input:

  pinMode(inRelay2, OUTPUT);   // set the digital pin as output:

  digitalWrite(inRelay2, HIGH);
}

void loop()
{
  // check to see if it's time to toggle the Relay;
  unsigned long currentMillis = millis();


  if (currentMillis - previousMillis >= interval) {
    // save the last time you toggle the Relay
    previousMillis = currentMillis;

    // if the Relay is off turn it on and vice-versa:
    if (relayState == LOW)
      relayState = HIGH;
    else
      relayState = LOW;

    // set the Relay with the relayState of the variable:
    digitalWrite(inRelay2, relayState);
  }


  val1 = digitalRead(inPin);
  val2 = digitalRead(inLimit);
  val3 = digitalRead(inLimit1);


  if (val1 == HIGH)
  {
    digitalWrite(inRelay, HIGH);
    digitalWrite(inRelay1, LOW);
  }
  else if (val2 == HIGH)
  {
    forward();

  }
  else if (val2 == LOW)
  {
    forwardstop();

  }
  if (val1 == LOW)
  {
    digitalWrite(inRelay, LOW);
    digitalWrite(inRelay1, HIGH);
  }
  else if (val3 == HIGH)
  {
    backward();

  }
  else if (val3 == LOW)
  {
    backwardstop();

  }

}

void forward()
{
  digitalWrite(M1, LOW);
  analogWrite (E1, 255);
}

void backward()
{
  digitalWrite(M1, HIGH);
  analogWrite (E1, 255);
}

void forwardstop()
{
  digitalWrite(M1, LOW);
  analogWrite (E1, 0);
}

void backwardstop()
{
  digitalWrite(M1, LOW);
  analogWrite (E1, 0);
}

45  Using Arduino / Sensors / Re: Aruino for IMAGE PROCESSING on: July 12, 2014, 12:55:34 am
http://blog.oscarliang.net/raspberry-pi-face-recognition-opencv/
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