Show Posts
Pages: [1] 2 3 ... 83
1  Using Arduino / Audio / Re: Anyone have an Adafruit Wave Shield? I need a few measurements taken. on: August 11, 2014, 01:58:33 pm
I have a few (and a custom hybrid version as well)..

however I am at work.. and will have to wait until I am home...(if that works for you?)

I'll use my digital calipers.. (as accurate as that can get at least)
2  Using Arduino / General Electronics / Re: what's this phenomenon called? on: August 11, 2014, 01:50:41 pm
Bipolar Power Supplies
<poor taste joke alert> Can you cure those with lithium batteries? </ptja>

I'll get me coat.

haha.. "I" laughed at least..
3  Using Arduino / General Electronics / Re: Directional keypad on: August 08, 2014, 03:57:33 pm
Myself... I would look at some slim-line remotes for dvd players.. or kids toys... (usually a gold mine of junk there to salvage)

IMHO though... the 'top side' is NOT the crucial portion of this..

is the underlying 'buttons' and connection that count.  the top can be re-done user a laser or even a vinyl cutter..etc..

get some extremely small/flat buttons/switches...  and work out the connectivity..

or see if you find an old key fob/remote that has the button layout you want. you can erase the 'markings' and re-do them yourself in any fashion you choose...

the care remote/fob idea might be the best approach as your getting a 'case' too... and I would think there is anough room inside to 'transplant' what you want..

is this a wired keypad? (if so that makes it easier)..

even if the remote/toy you have has extra stuff.. you can cut the top layer off and keep the direction key portion and laminate it over/onto your final 'case'.

what size are you looking for this to be?

4  Using Arduino / General Electronics / Re: Cheapest PCB house? on: August 07, 2014, 02:11:29 pm

are the ones I have used before..

all have their pros/cons..  some offer slightly better prices.. others offer free color...etc..

depends on the size of the PCB you want made.. and qty.

5  Using Arduino / General Electronics / Re: Directional keypad on: August 07, 2014, 01:51:09 pm
scavenge the part form these 'electronics' you see..

or make your own?

or go for a 5-position button??
6  Using Arduino / General Electronics / Re: Strange acting motor + servo combo! on: August 07, 2014, 01:49:28 pm
Are you sure there is enough current for everything?
I believe servo's can take up to 1A when under load...

Also.. never use those rectangle 9v batteries... they are notorious for being JUNK.
7  Using Arduino / General Electronics / Re: L298N Dual-H Bridge DC Motor Driver on: August 07, 2014, 01:46:10 pm
You plugged it into.. what?

The Arduino?  The Driver?

Is the L298N a bare chip on a breadboard?  a pcb?..etc..

Did you have the connections correct? (not reverse polarity?)

How about some pics?

8  Using Arduino / Project Guidance / Re: Bluetooth based watch and socket on: July 27, 2014, 09:09:18 pm
no.. I dont think so....(re:RFID)

from what I know from playing around with my MiFaire RFID set-up is that the range is extremely limited.  were talking 'near' contact only...  so they would have to lift something up off it/away from it and the relay would trip..  There may be other set-up they have a it more range, but not sure how large really and at what prices.  (do you need something mobile?)

what 'IS' the limit you are looking at?  you're not really telling any real specs you are looking to build for/toward. smiley

I would google all these topics yourself to make sure I am even correct... I am an noobie myself, and these comments are just from my limited reading and mostly knowledge/results from playing around with these components (ordered through ebay).. lol..

I'm a sure someone before you has wanted to know the distance using bluetooth.. (maybe with another component as well?)  see how they approached and solved it.

9  Using Arduino / Project Guidance / Re: RFID as Storage on: July 26, 2014, 10:59:50 pm

as mentioned..  I dont think the RFID cards/badges/key-fobs will have enough storage/space to store anything like audio.

You can store certain types of data in pre-determined areas on the card (chip)..

IMHO...  you could use an Adafruit WaveShield (or similar)

and save multiple .wav files on the SD card and access/play back any one of them based on the card that has been 'scanned'.

you can even set certain variables on a .txt file and load them in your sketch to even extend your project further without having to pljg in your computer and upload a new sketch.  the SD gives you storage for many .wav files..  and also the storage to put in a config type file to change/update small aspect of your code/program, again all without needing the Arduino IDE..  any old SD/microSD card reader gives you access to change the config file..or upload/save more .wav files (or change them out)..etc

10  Using Arduino / General Electronics / Re: Best way to power 3w RGB LED? on: July 26, 2014, 10:48:44 pm

thanks for the reply/clarification..

* oh they 'are' leds.?..  (I wasnt sure as there were 2 and how it applied to my set-up/question)..

* I believe I have only seen something like I/O (input/output) before... so I wasnt clear what it meant.

question: in the schematic posted, wouldnt BOTH leds be pwm'd at the same time since there is only 1 Arduino pin in use here?

if my goal is to have each die on the RGB led star then I need to have one of these circuit designs/layouts for 'each' channel (thats what you're saying 'yes' to...correct?)..  that means only one 'led' per 'circuit'...

using the schematic design above as an example...  this wouldnt work (as it is) being as there is two leds on one (constant current) 'circuit' and I want to individually PWM control each color.

(sorry if some of these seem stupid or obvious..but when/while still learning., when I see slightly different things, I'm not always sure if its how I'm supposed to do things...just an 'example' but not directly transferable to my project/question..etc. so I ask to can learn from solid building blocks/facts in baby steps)

Is that a 4.7k resistor?  (or 4.7M?..thats a pretty big resistor

Hopefully I can whip up a variant to my LM317 constant current approach/pcb this weekend and send out for some pcb's


Thanks for the alternate approach suggestion.. so then all (6 per group) pins would would be connected together and go to one die/color/channel?

Something to keep in mind...  but I think trying to learn how to make a proper constant current driver circuit will just help me in furture projects to come as well....  smiley
11  Using Arduino / Project Guidance / Re: Bluetooth based watch and socket on: July 25, 2014, 07:44:37 pm
I'm not sure about getting any sort of distance from a bt module.. (I suppose it would depend on the specific module?)

I have only played with the HC-05 type modules.. (which I thick are roughly 30 feet or so limit?)

anyways..  can you do a query/response type of approach? and if you dont get a 'response'..  you can assume you are out of range? and then trigger relay?
12  Using Arduino / General Electronics / Re: Digital Ground/Analog Ground, Arduino Gets Stuck! on: July 25, 2014, 05:13:40 pm
are your GND's connected?

I have seen some odd behavior powering servos from batteries.. where the GND's were not connected to the Arduino as well..

Also what does 'stuck' mean?  Like it doesnt boot?  it does some odd behavior?  get to certain point then wont respond any more?
13  Using Arduino / General Electronics / Re: Best way to power 3w RGB LED? on: July 25, 2014, 05:04:58 pm
Sorry for the late reply here..

(didnt get an email notification)..

I'm planning to give it another go this weekend (finally).. so I'll have to try and search around and see if I can understand your schematic (which I appreciate) that you posted.

So would I be using/making one of these 'circuits' (as you posted) for each die/channel on the led?...  right?

The 'O/I' is the Arduino pin...correct?

What are the components under the Vcc+

14  Using Arduino / Project Guidance / Re: 4 Digit, 7 Segment Counter Help on: July 20, 2014, 08:31:48 pm
I to would suggest that same chips CrossRoads suggest (MAX72xx chips)

Where my advice differs is that being that you are new, you may want to look into using one the available libraries to get your project up and running..

I use the LedControl library alot myself for quick and easy set-up

That being said the advice & approach given above will make you a better coder and understand the SPI protocol so it can be applied to other projects/SPI devices..    It is a 'crutch-free' approach and ultimately gives you more control instead of being pigeon holed into only being able to use the pre-made functions of a library.

15  Using Arduino / Project Guidance / Re: Controlling Arduino using iPhone on: July 20, 2014, 07:51:00 pm
Thanks!  I did -not- know about this limitation with iPhones!!

(how sad).. I really like the HC-05 BT modules!  they are only a couple dollars (USD).. and are dead simple to use!

Its a shame those iDevice people cant take advantage of this!
Pages: [1] 2 3 ... 83