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31  Forum 2005-2010 (read only) / Troubleshooting / MAN71A 7 segment, please help. on: April 20, 2009, 12:48:31 pm
I'm a bit confused here, maybe someone here can help me understand this?

http://www.datasheetcatalog.org/datasheet/QT/MAN71A.pdf



From what I can understand it got a common Anode, and anode is + yes?

5V should be connected to the Common Anodes right? But how do I then control what led to light up?

And how do the pin-numbers work, 1-14?
1-7 is from top-left - bottom-left, and 8-14 from bottom-right - top-right?

Please do help me understand this  smiley
32  Forum 2005-2010 (read only) / Interfacing / Re: Sonar distance sensor underwater? on: September 16, 2010, 12:55:03 pm
Quote
Yes, but your antenna will be hundreds (if not thousands) of km long.

Common hobby sonar units are not waterproof.

So you are saying that RF doesn't work underwater? Right?

And, what if I somehow wrap the sonar-module, so that it's waterproof.


33  Forum 2005-2010 (read only) / Interfacing / Sonar distance sensor underwater? on: September 16, 2010, 12:48:52 pm
Can it somehow be used to check distance underwater? Like a submarine sonar, check depth under keel etc.

Also, can the RF 315 or 415 mHz send underwater? is it possible?
34  Forum 2005-2010 (read only) / Interfacing / Serial Enabled 16x2 LCD - Red on Black 3.3V on: July 31, 2009, 08:22:31 am
http://www.sparkfun.com/commerce/product_info.php?products_id=9068

I'm interested in these LCDs, since they use serial they do not consume alot of pins right?

But, is there a libary for these? And are there a guide to show whats pins goes where and etc.

- thanks
35  Forum 2005-2010 (read only) / Interfacing / Re: Arduino + LMB0820 LCD on: July 16, 2009, 05:02:21 pm
Hm, when attaching the Analog pins, 0,1,2. The black-spot on the back gets extremely hot. Something isn't right there.

When I attach more than 2-3 digital pins, the chip at the back gets to 40C and rising slowly, until it reaches such a high temp that I'm cutting off power to it.

I'm guessing it shouldn't do that?

36  Forum 2005-2010 (read only) / Interfacing / Arduino + LMB0820 LCD on: July 16, 2009, 12:30:49 pm
I just can't get this working.

http://www.seeedstudio.com/depot/lcd-82-characters-blue-back-light-p-120.html

When hooked up as seeedstudio says, it only lights up, and gets very hot...

When looking at example:

//RS-->PC0
//RW-->PC1
//EN-->PC2

PC1,2,3 what are those?

From picture at seeedstudio A0,1,2 analog?
37  Forum 2005-2010 (read only) / Interfacing / 20x4 Serial LCD from sparkfun. Won't print 20chars on: November 27, 2009, 05:28:21 am
Somehow it only prints 16 chars per line. Dunno why?



Code:
Code:
#include <NewSoftSerial.h>
NewSoftSerial mySerial(7, 8);

void setup()
{
  mySerial.begin(9600);
}

void loop() {
  // Example usage:
  clearLCD();
  backlightOn();
  //Print text on each line
  selectLineOne();
  delay(100);
  mySerial.print("AAAAAAAAAAAAAAAAAAAA");
  delay(10000);

}
//SerialLCD Functions
void selectLineOne(){  //puts the cursor at line 0 char 0.
  mySerial.print(0xFE, BYTE);   //command flag
  mySerial.print(128, BYTE);    //position
}
void selectLineTwo(){  //puts the cursor at line 2 char 0.
  mySerial.print(0xFE, BYTE);   //command flag
  mySerial.print(192, BYTE);    //position
}
void selectLineThree(){  //puts the cursor at line 3 char 0.
  mySerial.print(0xFE, BYTE);   //command flag
  mySerial.print(148, BYTE);    //position
}
void selectLineFour(){  //puts the cursor at line 4 char 0.
  mySerial.print(0xFE, BYTE);   //command flag
  mySerial.print(212, BYTE);    //position
}

void clearLCD(){
  mySerial.print(0xFE, BYTE);   //command flag
  mySerial.print(0x01, BYTE);   //clear command.
}
void backlightOn(){  //turns on the backlight
  mySerial.print(0x7C, BYTE);   //command flag for backlight stuff
  mySerial.print(157, BYTE);    //light level.
}
void backlightOff(){  //turns off the backlight
  mySerial.print(0x7C, BYTE);   //command flag for backlight stuff
  mySerial.print(128, BYTE);     //light level for off.
}
void backlight50(){  //sets the backlight at 50% brightness
  mySerial.print(0x7C, BYTE);   //command flag for backlight stuff
  mySerial.print(143, BYTE);     //light level for off.
}
void serCommand(){   //a general function to call the command flag for issuing all other commands  
  mySerial.print(0xFE, BYTE);
}



And! how come this 20x4 needs some delay? Or else it won't show anything. The 16x2 lcd I got just prints it without the need for a delay.
38  Forum 2005-2010 (read only) / Interfacing / Breakout Board for Electret Microphone, no reading on: November 21, 2009, 08:18:49 am
http://www.sparkfun.com/commerce/product_info.php?products_id=8669

Just got that one, and using the example for AnalogSerialInput, but I only get 500+-, no reaction what so ever.

How come?

39  Forum 2005-2010 (read only) / Interfacing / Re: eBay 20x4 Blue Serial LCD questions on: November 12, 2009, 09:27:36 am
Hm, I'm just curious. The Graphical serial displays, how much more complex is it to get them working?
40  Forum 2005-2010 (read only) / Interfacing / eBay 20x4 Blue Serial LCD questions on: November 12, 2009, 08:43:55 am
Anyone know if this one:

http://cgi.ebay.com/Serial-LCD-Kit-117-9600-Blue-LCD-Assembled_W0QQitemZ360163475771QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item53db6a813b

Will work similar to the 16x2 Serial displays they sell on sparkfun?
41  Forum 2005-2010 (read only) / Interfacing / Re: Where to get continous servos? on: May 03, 2009, 02:24:38 pm
Wrote an easy guide for making Mystery 9g servos continous.

Since these servos are very cheap off ebay, or dealextreme.com

http://www.dealextreme.com/details.dx/sku.20023

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=150302752989

Heres the link for the guide:

http://stigern.net/blog/?p=96

Easy, no need for extra components. Only glue and cutting tools smiley
42  Forum 2005-2010 (read only) / Interfacing / Re: Where to get continous servos? on: April 17, 2009, 04:51:27 pm
That listing is only for Futuba?

I've only bought cheap-china servos atm. Is futuba that much better?
43  Forum 2005-2010 (read only) / Interfacing / Re: Where to get continous servos? on: April 17, 2009, 04:24:43 pm
Hint: don't buy all of the servos you need at once!

How come?
44  Forum 2005-2010 (read only) / Interfacing / Where to get continous servos? on: April 17, 2009, 03:54:55 pm
Or, where to get ones that are easy to mod?

Just want a few that has the limit removed.
45  Forum 2005-2010 (read only) / Interfacing / Modding a E-sky servo for 360 runs? on: November 12, 2008, 09:39:43 am
Got two E-sky servos, the one found in the Lama v3. But can't seem to find how to mod them for continuous run.

Anyone know how?

Or, got a recommendation for easy-modifiable servos?
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