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1  Using Arduino / Project Guidance / Re: Smallest Arduino-compatible IC? on: October 10, 2013, 02:39:55 pm
So basically I need the smallest (in terms of associated part count) non-SMD Arduino-compatible IC, which can run off 3V3 and plug into the IRRemote and DHT22 libraries. Any ideas?

Look into the AtTiny series chips (Attiny45, Attiny85, Attiny44, Attiny84) from Atmel.
Just google "Attiny arduino"
2  Using Arduino / Project Guidance / Re: using wireless methods on: October 10, 2013, 02:37:44 pm
Yes, what you want can be achieved.
However, note this: If you want the two boards to communicate with variable data across a distance, then you shouldn't use RFID. Instead use, e.g., Xbee or other wireless transmission method.
Or to keep it very inexpensive ($2-3), assuming the two modules will be in line of sight from each other, you can use an infrared emitter on the sender and an infrared receiver on the receiver.
3  General Category / General Discussion / Re: Hi! on: October 10, 2013, 12:12:58 am
Welcome! The example sketches are the best way to start. If you do the first dozen or so official Arduino tutorials on the webpage, you should be good to go as far as required knowledge for your robot!

Im new to the Arduino platform. Im messing with the example code's on an UNO R3 . Getting to know the code step by step,i think......
My closest sort of any programming was a Tandy Color Computer III 128K, which used a language similar to PBasic, That was a long time ago.
I decided to put together a 2WD Robot , AnD my daughter thought it would be "sick" if it could wander about looking for fire,deploy emergency lights,sounding an alarm .

4  General Category / General Discussion / Re: Need some guidance on finishing this enclosure on: October 09, 2013, 11:55:47 am
Where are you located?
5  General Category / General Discussion / Re: Need some guidance on finishing this enclosure on: October 09, 2013, 11:47:43 am
3D Printer: Ultimaker (at my local hackerspace).
Software: ViaCAD and Sketchup, as well as a couple of rendering plugins.
6  General Category / General Discussion / Re: Need some guidance on finishing this enclosure on: October 09, 2013, 11:41:30 am
I would love to see some pictures of this enclosure if you could post them. I am looking into doing something similar.
Not done yet. Planning to 3D print it!
7  General Category / General Discussion / Re: Need some guidance on finishing this enclosure on: October 09, 2013, 11:38:06 am
That works! There probably isn't a simpler way either.
8  General Category / General Discussion / Need some guidance on finishing this enclosure on: October 09, 2013, 11:31:23 am
I am making a couple of enclosures for my two boards, which will perform different functions, but sit next to each other.
I want the boxes to be attached/detached easily to each other along one face.

I've already done the Attachment half of it.
For the attachment mechanism, I came up with this method, inspired by my TV remote control:
 - Plastic hooks/inserts on the side faces of one enclosure (male)
 - Cutouts/holes on the other enclosure (female).
 - Thus, the asymmetric hooks slide into the cutouts and then are blocked from getting out.

But now how can I modify the box design to also make it detachable?
In other words: Once the hooks get into the cutouts, how can I make them come out?
9  Using Arduino / Programming Questions / Re: Can SPI pins on Leonardo also be used for digitalRead/Write? on: October 03, 2013, 02:36:26 pm
Found the answer (using the "pins_arduino.h "file in this folder:   ../arduino-1.0/hardware/arduino/variants/leonardo/pins_arduino.h  ):

D14-D17 map to the SPI pins as follows:
// D14                 PB0                   RXLED,SS/PCINT0
// D15                 PB1                    SCK,PCINT1
// D16                 PB2                   MOSI,PCINT2
// D17                 PB3                   MISO,PCINT3
10  Using Arduino / Programming Questions / [SOLVED] Can SPI pins on Leonardo also be used for digitalRead/Write? on: October 03, 2013, 02:08:36 pm
On the Leonardo, I noticed that SPI is isolated to the pins on the ICSP connector.

Can these pins also be used as standard Digital I/O pins?

I don't mean with low-level C/C++ code, but rather:
Are those SPI pins allowed as Digital I/O pins (or can they be enabled as such) from within the Arduino framework? If so, what are the corresponding pin numbers for them?
11  Using Arduino / Displays / Re: Looking for capacitive touch screen on: July 21, 2013, 10:29:59 pm
Thanks for the info. I checked them out and they seem to be having the right one, but they are out of stock. Do you have any other leads by any chance?
Try these guys:
12  Using Arduino / Sensors / Re: ov7670 with both arduino uno and now mega on: July 18, 2013, 09:40:08 am
@Mr_Arduino, Terrific effort by you on this code, as well as answering people's questions! I see you are also adding support for the MT9D111. I'm definitely going to try the Omnivision module with this code.

Here is a suggestion: Perhaps you could take a few minutes and turn this into a standard structured Arduino-importable library (along with an example usage sketch of .INO filetype).
Along with that, you could make a few lines of tutorial out of your build including the hardware connections, and put it on the first post of the thread, so that others can reproduce your setup (there will also be fewer code-troubleshooting questions that way).

Also, here's a cool video by someone in Japan who made a TFT-camera out of it (this is where I first learned about the OV7670):
Not sure how they got this kind of almost real-time video from it using just the Atmega:

Actully my latest code does not use the wire library see or if you feel the need to use the Wire library my very old code uses it see
13  Using Arduino / General Electronics / Re: Options for inexpensive PCB assembly on: July 18, 2013, 07:31:23 am
@CrossRoads - not bad at all! I could give that a shot.

@KirAsh4: It's double sided. Although relatively few parts on the bottom side.
(Based on my own oven reflow experiments, none of them were heavy enough to fall during reflow.)
14  Using Arduino / General Electronics / Options for inexpensive PCB assembly on: July 17, 2013, 12:17:12 pm
How much does it cost to have a PCB assembled in quantities of 10 ?
For example, a board that's about similar size and complexity as an Arduino Uno.

I understand that is a low quantity, but I have a requirement to make professional-quality boards for a design I have been working on. (I have experience with hot air gun and hand-soldering, but for quality reasons, wish to source it to a assembly house, whether in US or Europe or China, etc.)

I am wondering whether options exist to do it for less than US $ 20 per board. That exact figure is probably unrealistic but I want to see how close I can get to my target.
15  Using Arduino / General Electronics / Re: How does this sensor measure liquid level? on: July 04, 2013, 10:16:38 pm
Hmm, I think you might be right. Perhaps they use the bottom-most electrode/pad as one plate of the capacitor, and based on the capacitance measured at the various other pads, they can infer the volume of the dielectric, which I guess would be the spherical analogue of a pair of opposite-facing capacitor plates.
I want to try to make one of these and see how accurate it will turn out.

it would appear that the sensor comprises a number of discrete pads;  if so, the capacitance between pads is a function of the spherical dielectric
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