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1  Community / Exhibition / Gallery / Re: Using android mobile to control arduino on: April 14, 2014, 04:31:38 am
I'll update it one day but my friend borrowed the bluetooth module for some experimenting so it might take a while.

You can still access the older version of app inventor here -> http://beta.appinventor.mit.edu/
And here are all of my projects -> https://drive.google.com/folderview?id=0B_PfPoEotOF8N2JwT3RSX011SjQ&usp=sharing

Just use the older version to see what blocks I used and what they do and rebuild it in the newest version. Or just use the old one
2  Community / Exhibition / Gallery / Re: Using android mobile to control arduino on: March 20, 2014, 06:21:55 pm
1. Well if you want to control more than one LED just modify the app.
2. If you want a status indicator then you can either implement it within the app without getting any confirmation from the board that the message was received (less complicated) or write a code that sends serial data from the arduino board to the phone when the LED is switched on.

@ spyrakos88
I have no idea why it doesn't work with attiny85, but there is an error in your code (or at least the version that you posted here). Your void loop() is missing a "}" sign. Other than that make sure your tx pin is attached to rx pin on the bluetooth module. What's more make sure the baud rate of your code is the same as the one your bluetooth module is set to. What's more try to get rid of that serialEvent - I don't know if it works with software serial, but I know that it doesn't work with leonardo, micro and esplora. So get rid of it.
3  Community / Exhibition / Gallery / Re: Using android mobile to control arduino on: February 16, 2014, 06:31:07 am
No, I don't.
My advice ?? open the old file using the old version of app inventor, see what blocks are used and what they do and then replicate it in the new version
4  Development / Other Software Development / Re: Accel stepper library with support for 28byj-48 motor on: February 01, 2014, 03:52:53 pm
That's what the datasheet says. IIRC sbbright mentioned it in his example code.
5  Development / Other Software Development / Re: Accel stepper library with support for 28byj-48 motor on: January 28, 2014, 08:55:11 am
They need an 8 step sequence. I used the newest version I could find
6  Development / Other Hardware Development / Re: Bluetooth shield not working on: December 29, 2013, 12:38:54 am
The correct approach here is to makes sure arduino receives anything in the first place. Create a sketch that will light an LED whenever the board receives anything through serial. Once you establish that it is indeed true you pretty much have two options left:
1. your app sends something else than you think it's sending
2. your sketch doesn't work the way it should
3. both option 1&2

Whenever you have problems with communication you have to establish which device is causing problems. To establish that try to send data to the arduino through USB instead - send what you think the app should be sending and see if it reacts the way it should. Then do the same with the app - connect to your PC instead (not the BT shield/module) and use program such as putty to see the output.
7  Topics / Robotics / Re: Wireless Video Streaming? on: December 29, 2013, 12:31:53 am
You can use a smartphone for streaming - you just have to dowload an app that turns it into an IP cam. Search for IP cam on Play store - it's free IIRC

Alternatively you can get one of those cheapo wifi routers like MR3020 or TL-WR702N (might be the same model actually but the company sometimes uses different model names for different markets), flash it with openWRT and add some drivers and do some configuring to get them to stream video. There are literally tons of tutorials on doing this on the internet so just use google and you'll find what you need


Ohh you might as well just use hardware used for FPV in RC models, but that's a bit pricier.
8  Community / Exhibition / Gallery / Re: Using android mobile to control arduino on: December 17, 2013, 07:03:13 pm
Just use the previous version. Upload it there and see how it works, you can replicate it in appinventor2 in a few minutes once you understand what's needed.

Also as far as I know Appinventor 2 doesn't have any new features yet and its GUI is almost identical

Here you can access the standard version http://beta.appinventor.mit.edu/
9  Development / Other Software Development / Re: Accel stepper library with support for 28byj-48 motor on: December 16, 2013, 01:43:36 pm
usually I run it much faster and it works fine
10  Development / Other Software Development / Re: Accel stepper library with support for 28byj-48 motor on: December 16, 2013, 11:41:48 am
hmm no idea really... uploaded your code and it works just fine.

I see two possible options
1. Try lowering speed and acceleration as the motors move better in one direction that the other so my only guess is that it is stalling.
2. Your wiring is incorrect


11  Using Arduino / Interfacing w/ Software on the Computer / Found a nice program for saving serial data into a file on: November 26, 2013, 11:23:55 am
I am aware that some of you know that there exist such programs, and/or have even written their own applications in processing that could do that (been there done that)... My intention is to share this with those who might need it.

Anyway.... I found a very nice program called Coolterm - created by Roger Meier (freeware)
Can be downloaded here -> http://freeware.the-meiers.org/



12  Using Arduino / Interfacing w/ Software on the Computer / Re: Arduino + Android on: November 26, 2013, 11:18:37 am
You might want to see some of my projects involving interfacing arduino and android.
I use MIT's appinventor to create apps (very easy to do - watch the second video to see how it's done)
There are two methods for communication  - one that relies on bluetooth communication and one based on ethernet



I posted it here on arduino forum -> http://forum.arduino.cc/index.php/topic,148853.0.html
13  Using Arduino / Networking, Protocols, and Devices / Re: 2-3 miles range communication between two arduino units on: November 15, 2013, 05:08:43 am
Yeah, I've seen them and I have known about long range wifi links - surprisingly few people know about them. My point was that:
1. He just wants to send a simple signal with a time stamp using between two arduino, one of which will probably be powered using batteries so there's no point in using power hungry devices. With the module he switches sending when on when it's needed and that's it. No modification to a wifi router to make it boot beforehand etc are needed.
2. Lower frequencies have better propagation - he might as well build a canteena or patch antena tailored to the frequency and he's going to get better range anyway.
14  Using Arduino / Networking, Protocols, and Devices / Re: 2-3 miles range communication between two arduino units on: November 15, 2013, 12:30:53 am
Not sure if you posted it just to rise awareness of long range wifi links - if that's the case then I'd say OK
But if this is your real suggestion then our definition of what's practical and what's not differs a lot  smiley
15  Community / Website and Forum / Re: intermittent forum errors today (Nov 8) on: November 15, 2013, 12:25:34 am
Same here. Exactly the same situation 'too many responses etc.'
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