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1  Using Arduino / Project Guidance / 6V barrel battery - holder? on: January 27, 2011, 01:19:42 pm
Still working on my very compact arduino project where I'm using a 6V barrel shaped battery (duracell 28A) http://www.batteriesplus.com/pc-30370-30370-PX28ABPK.aspx

Anyone know if there exists a battery holder for this size battery?  Dimensions: 13mm Diameter x 25.2mm Height

Been looking everywhere and I can't find one.  Any ideas would be appreciated.
NYC
2  Forum 2005-2010 (read only) / Troubleshooting / Re: soldering Cat5, help on: December 17, 2010, 12:53:35 am
Yes, I bought those breakouts and they work great for the connector side.  My plan was a good one, except for the fact that I didn't count on the wire not cooperating.  Maybe screw headers will work.
3  Forum 2005-2010 (read only) / Troubleshooting / Re: soldering Cat5, help on: December 17, 2010, 12:27:36 am
RJ45s:
http://www.sparkfun.com/products/643

I'm still hoping that some flux paste will help my situation.
4  Forum 2005-2010 (read only) / Troubleshooting / soldering Cat5, help on: December 16, 2010, 10:07:43 pm
Hi,
I decided to use a few Cat5 cables to keep a project neat and tidy.  Bought some RJ45 pcb connectors and everything looks great except when I opened up the Cat5 cable.  I need to use 4 of the 8 wires.  I stripped off the wire coatings and then tried to solder the leads of an LED onto two of the wires.  No luck!  The solder wouldn't stick!  How do I fix this?  I tried wiping the wire with sandpaper.  No change.  Can I somehow treat the wire so that it will take up the solder? (p.s. using rosin core solder)
5  Forum 2005-2010 (read only) / Interfacing / Re: battery power for ardweeny or RRRRRRRBBA on: January 22, 2011, 07:36:42 pm
Thanks for the suggestions.

I am currently using a RBBB running off of a 9V battery which works great, but is still too bulky.  Ideally, I'm shooting for the fewest number of parts and the smallest battery possible.
6  Forum 2005-2010 (read only) / Interfacing / battery power for ardweeny or RRRRRRRBBA on: January 22, 2011, 01:23:18 pm
I want to power either the ardweeny (http://www.solarbotics.com/products/kardw/resources/) or the RRRRRRRRBBA (http://www.instructables.com/id/The-RRRRRRRRRRBA-or-What-They-Dont-Teach-You-in-/) by battery.  Can I stick a 6V battery onto their of these? ....or do I need to have a voltage regulator?
7  Forum 2005-2010 (read only) / Interfacing / Re: Speakjet trigger buttons on: November 16, 2010, 11:26:54 am
Genius!  Works great.  Thank you!
8  Forum 2005-2010 (read only) / Interfacing / Re: Speakjet trigger buttons on: November 16, 2010, 11:05:59 am
Thanks!  Is it possible to just wire a switch without using the Arduino?  Not sure how to create a 'high' and 'low' state with just components.
9  Forum 2005-2010 (read only) / Interfacing / Speakjet trigger buttons on: November 16, 2010, 12:40:14 am
Hi all,
Just got a Speakjet today and I'm successfully using it with the Phrase Translator software.  I would like to trigger sounds in EEPROM via push buttons but I don't know how to wire up the buttons (switches).  Has anyone accomplished this?
10  Forum 2005-2010 (read only) / Interfacing / Re: noob motor/gear question on: July 12, 2010, 07:44:11 pm
Thanks for the ideas.  I will get a gear-motor.  I just finished hacking a servo to behave like a motor and it does the right thing, but it's too loud and will distract from the sound of the music box (which may eventually be recorded, so quiet operation is key).

11  Forum 2005-2010 (read only) / Interfacing / noob motor/gear question on: July 12, 2010, 03:57:31 pm
Hi all,
I am trying to drive a mini music box with a toy DC motor and my arduino.  The music box has exposed gears with teeth on them.  My motor shaft doesn't have any gears on it.  How do I hook these two together?  I get that I need to buy some plastic gears to fit onto the motor's shaft, but is there some tricks to getting the motor and the music box gears lined up properly?




12  Forum 2005-2010 (read only) / Interfacing / Re: Lcd Librairy problem on: May 22, 2010, 12:01:06 am
I have the same LCD as you and hooked this up just last week.  I followed the example sketch called LCD_Example (under the File, Examples, Display).

Here's the sketch:

// character LCD example code
// www.hacktronics.com

#include <LiquidCrystal.h>

// Connections:
// rs (LCD pin 4) to Arduino pin 12
// rw (LCD pin 5) to Arduino pin 11
// enable (LCD pin 6) to Arduino pin 10
// LCD pin 15 to Arduino pin 13
// LCD pins d4, d5, d6, d7 to Arduino pins 5, 4, 3, 2
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);

int backLight = 13;    // pin 13 will control the backlight

void setup()
{
  pinMode(backLight, OUTPUT);
  digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.
  lcd.begin(16,2);              // columns, rows.  use 16,2 for a 16x2 LCD, etc.
  lcd.clear();                  // start with a blank screen
  lcd.setCursor(0,0);           // set cursor to column 0, row 0 (the first row)
  lcd.print("Hello, World");    // change this text to whatever you like. keep it clean.
  lcd.setCursor(0,1);           // set cursor to column 0, row 1
  lcd.print("hacktronics.com");
  
  // if you have a 4 row LCD, uncomment these lines to write to the bottom rows
  // and change the lcd.begin() statement above.
  //lcd.setCursor(0,2);         // set cursor to column 0, row 2
  //lcd.print("Row 3");
  //lcd.setCursor(0,3);         // set cursor to column 0, row 3
  //lcd.print("Row 4");
}

void loop()
{
}
13  Forum 2005-2010 (read only) / Interfacing / Re: ultrasonic sensor + real time clock question on: March 16, 2010, 09:59:25 am
Guys, thanks for the help!

RC, yes, it will eventually be solar powered if I can get that to work reliably.
14  Forum 2005-2010 (read only) / Interfacing / ultrasonic sensor + real time clock question on: March 15, 2010, 01:19:01 pm
Hi,
I've got an ultrasonic sensor, wave shield and DS1307 on my arduino.  My project requires that the sensor only operate during the hours of 10:30pm and 7:30am.  (it senses motion in an area and produces an audible message once triggered).

Ideally, I'd like the Arduino to enter sleep mode at 7:30am and then 'wake up' at 10:30pm.  I have the sleep mode code and tried the sketch.  It seems to work.  But I don't know how to get the RTC to tell the Arduino when to go to sleep and when to wake up.

I have read many posts on the RTC but I get lost in understanding the code.  Can someone give me a hint as to where I might start?

Here's my thought:

currenttime = read time from RTC
waketime = 22 hr 30 min (on 24 hour clock)
sleeptime = 7hr 30 min

if waketime == currenttime {
   wake up arduino }

if sleeptime == currenttime {
   put arduino to sleep }


----
As an alternative, I could also just disable the sensor or wave shield output during those times (saving power would be nice, but not a requirement).  Either way, I don't know how to access the RTC current time and compare it to a variable. Any help would be appreciated.

NYCTHINKER
15  Forum 2005-2010 (read only) / Interfacing / Re: I'm Selling Arduino MEGA + other stuff. on: March 15, 2010, 10:34:35 am
How "used" is everything?  Will you ship to the U.S.?
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