Show Posts
Pages: 1 ... 88 89 [90] 91 92 ... 109
1336  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to connect 74HC165 ? on: December 04, 2010, 10:20:49 am
MAX, realizing you like the 595 means you have need of OUTPUTS...   but if you need inputs... it's just not the right device.

As stated by crossroads, there are MANY options related to shift registers and the handshaking required is nearly identical in all cases.  So, master one chip, and all the rest should be so much easier.

Once you understand how CLOCK, SELECT or LATCH and DATA work it starts getting fun.

A long time ago I built an extendable relay panel that allowed you to add or remove a board with 8 INPUTS and 8 OUPUTS per board.  I used an INPUT pin on the controller that was fed to the LAST OUTPUT of the last board.  Essentially, it was a form of feedback... during STARTUP, the controller sends out a data bit and keeps shifting bits until it sees that feedback pin change state.  

This way you can daisy chain shift registers and not need any special code each time you add and remove them.  
1337  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino Ethernet Shield - Tutorial Suggestions? on: February 20, 2010, 01:26:33 pm
The reason is that Ethernet and network protocols are not simple.
1338  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Putting DS18B20 outdoors on: November 27, 2010, 09:34:53 am
To avoid heating from Solar Radiation, you need to build what is known as a Stevenson Shield.

http://en.wikipedia.org/wiki/Stevenson_screen

It is an enclosure that allows heated air to EXIT whatever container is protecting the sensor from the elements.  See examples... you should be able to com up with a waterproof solution without too much trouble.
1339  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Trouble with the H bridge on: November 25, 2010, 08:46:57 pm
It's Not identical then....  I'm not trying to sound all nit picky... but are we supposed to assume that you correctly provide Vcc1 with 5 Volts for LOGIC and Vcc2 with Motor Driver Voltage?  There is no way we can know that without some form of picture of what you did... (schematic... photo... etc)
1340  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to do siftables using arduino dueminalove ?? on: May 18, 2010, 11:10:48 am
Quote
do we need to do separate programs...for each arduino dueminalove......

Most certainly.

This will require code.  A multi-nodal network stack would likely need to be used... I imagine that one of the protocols used for RS485 networks might be a good starting point.

Google: MODBUS or SNAP protocol.
1341  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to tell difference between Transistor and PUT? on: November 19, 2010, 11:05:39 am
Wow... I have a few... and I've had them about 40 years.  These little guys were fun... but they look EXACTLY like a TO-92 transistor.

Funny thing is... I don't recall ever seeing a PUT tester.
1342  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Using Arduino to Control Motors to Create Music on: November 18, 2010, 11:42:00 am
Just to chime in...  (Am I tossing another log on this fire?)

Quote
where to start with the code

This a basic problem that the Arduino "solution"  itself creates.  One might research or talk to a friend who says... " the Arduino would be great for that!" and then the "uninitiated" wants to just jump in and work on their SUPER project right away... without learning how the Arduino works and how sketches are written.

I've seen this same issue countless times and it is not limited to Arduino by any means.  For example, I taught myself how to create 3D Models for simulators a few years back and it was hard work.  I did try to create ultimate project right away... but quickly learned I didn't know enough.   I had to try a lot of small projects before I was able to create the 3D Model I really wanted to see created.  

This same thing applies to Arduino.  There is also a good chance that nobody has some off the shelf code ready to pass out to someone who says "hey I need a...".

My advice... Look at all of the information on the Arduino web site.  references.. playground, etc.  Create some small projects and learn some basic concepts.  Then the "not knowing where to start" problem will be replaced by "I bet I could add  something cool to my project like an LCD or midi interface".

You don't build a skyscraper by starting with the restaurant at the top.
1343  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Galvanic Skin Response Board. on: November 18, 2010, 11:26:15 am
There are some off-the-shelf Instrumentation Amplifiers that would simplify your input circuit and would work rail-to-rail making it well suited to using the built-in A/D input of the arduino.  Analog Devices has specialized in medical grade devices for many years.  At about $7.00 the AD8220 is kind of pricey but it would be a good choice.

I'm not sure that the LM324 is considered to be best choice here, that's why I mention it.

1344  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Is CP2102 a good solution? on: November 09, 2010, 10:11:54 pm
The real important issue here is that all you need to accomplish is converting SOMETHING from the PC  to ttl level SERIAL I/O for the  Arduino.  So it doesn't really matter... as long as what you give Arduino is what it expects.  

I think the important point here is to know how you will use the custom assembly you will make and how much it will cost you.

For example: For breadboard solutions... I already had a Parallax USB to Serial Adapter so I didn't need to mess with my own Surface Mount device... I had something off the shelf.  I also have a Schmartboard Serial to TTL adapter...  

At first glance, it would look like I spend $20.00 more than I needed to... but the bonus is... I already had these parts for other projects and they just sit in my Breadboard parts collection.  I can easily use these parts other AVR or PIC projects.

The FTDI part clearly has "ease of use" handled.  It's probably why Parallax also selected this chip for their products.

1345  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Bootloader doesn't work with internal oscillator on: November 08, 2010, 12:14:24 pm
NOT IN SYNC = Bad RS232 Communication.

It looks to me like you need CROSS your wires.  TX-RX   It looks like you have TX going to TX and RX going to RX.  (Whch usually does not work... with serial coms)
1346  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: DIP Socket or Holder for Mini 04 on: November 02, 2010, 11:56:32 am
It's not much different than a boarduino... this is what I use for my projects:  Half Size breadboard.

http://www.adafruit.com/index.php?main_page=product_info&cPath=19&products_id=72
1347  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Job Posting: R&D Interface Engineer on: October 27, 2010, 11:30:17 am
To be honest... I don't think you went too off the mark posting this here either... a LOT of us ARE dang close to the person you are looking for...

1348  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Job Posting: R&D Interface Engineer on: October 26, 2010, 08:07:32 pm
Not hard to figure out...

http://www.lasershot.com/Contact%20Us/

I'm actually somewhat awestruck that someone in America is even *thinking* about creating jobs that an American might actually do.
1349  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino Podcast? on: January 24, 2010, 08:59:01 am
My personal preference is a mix of "wizardry and techniques" mixed in with what's in the Exhibition parts of the forum.
1350  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino Podcast? on: January 24, 2010, 08:22:21 am
Lots of people put very specific Arduino videos on Youtube.  Lots to see, but many leave me thinking,  "Great Vid but you are just bragging with no sharing, no website, no text blog... etc).  Ahem...  all very "Look at me", I think.

So you would rather it be something more like a video blog (I did this) or like a tv show (interviews and stuff) or teaching (Help me,  Mr Wizard!)?  All backed up by a website, with notes, and code and guides and such?

Just keeping this thread creative, btw.
Pages: 1 ... 88 89 [90] 91 92 ... 109