Sound reactive app

I'm not sure what I want to do it actually possible in App Inventor as I have been unable to find any examples.

What I want to do is play a sound file but then have the app react to the sound its playing.

The plan would be that the app would be controlling some leds that would change colour, brightness in time with the sound.

I can already do the led control its just the part about getting the app ti be able to hear whats its playing and convert that into some value.

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That sounds hard.

Consider simulating a player piano, with multiple channels in parallel,

each controlling an LED or sound, in lock step.

Search the Internet for the MIDI message data stream

for a way to encode a performance for your device.

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write a Number using a keyboard which i made with buttons

how to write a Number of two digits or three... (Units, tens and hundreds...) using a numbers keyboard which i made with buttons.?

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Search in the Gallery for "Calculator" for lots of examples.

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thank you very much

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How to save dynamic data with each count and take the average of data?

I want to create an app in which the dynamic light intensity data taken from light sensor extension of PuraVida apps (https://puravidaapps.com/light.php) to be saved in a database or list for 30 seconds or 30 counts and then find out the average of the 30 light intensity data from the database/list. I can do it by saving the each data of the light sensor in a label text and find the average. but the problem is that it is a manual and lengthy method and the size of the app becomes large. Please give me a solution for these problem. The aia file and the block image is attached.

Ligthintensity.aia

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and then find out the average of the 30 light intensity data from the database/list.

see my answer here about how to get an average value https://groups.google.com/d/msg/mitappinventortest/GNi52HOZ50U/q2r5gkZuEAAJ

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Sir, I have tried that , please find the aia file in the attachment. but I need an alternative simple method.  

LigthIntensity.aia

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what about using a sum variable to add all the temperatures and another counter variable to increment on each temperature received?

to get the average, just divide the sum variable by the counter variable...

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Sir can you please help me with this blocks...I am not able to do it yet...

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you might want to try something following my recommendations if if you get stuck, then post a screenshot of your relevant blocks

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook   http://www.appinventor.org/book2 ... the links are at the bottom of the Web page.  The book 'teaches' users how to program with AI2 blocks.

There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro  and the aia files for the projects in the book are here:  http://www.appinventor.org/bookFiles  

How to do a lot of basic things with App Inventor are described here:  http://www.appinventor.org/content/howDoYou/eventHandling  .

Also do the tutorials http://appinventor.mit.edu/explore/ai2/tutorials.html to learn the basics of App Inventor, then try something and follow the

 Top 5 Tips: How to learn App Inventor

You will not find a tutorial, which does exactly what you are looking for. But doing the tutorials (not only reading a little bit) help you to understand, how things are working. This is important and this is the first step to do.

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Sir here is the problem, I can do it manually by saving each intensity data over a time in a label and then calling them to plot a graph. But this limits its applicability for a large sent of data. Again, the timer count has been used in x axis as manually as you can see from the block image. Please refer me any method so that, a variable of database can store the intensity values after each count and after that I can extract them to plot a graph.

ScatterEXP.aia

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Avoid redundancy

Probably it helps to read chapter 19 - 21 in Dave's book http://www.appinventor.org/book2 to get an idea how to do DRY programming with App Inventor - Don't repeat yourself 

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If you find yourself needing more blocks for more data, you are doing it wrong, and need to learn how to use lists.

See the Lists, Graphs, and Books and Tutorials sections of this FAQ:

https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/mitappinventortest/2cd6Uz__xA0/cPQSiZpcDAAJ

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I now prepared am example for you...

LigthIntensity.aia

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Thank you very much sir.

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Tester connection problem

i have two question, why my project can't connect in Ai Companion and why emulator connection also can't processing my project.

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Have you seen the Companion and Emulator section of this FAQ?

FAQ for Companion and Emulator

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how to buid a spelling bee app

please am new to app inventor and i want to build a spelling app such that when you saved the words in a list, you can pick each word from the list and using text to speech, it pronounce the word then you spell it. If the pronounce word is spelt correctly, it move to the list and pick another word in a random manner......i really need help on this please, thanks

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Have you done the Talk To Me tutorial app yet at

http://appinventor.mit.edu/explore/ai2/beginner-videos.html

?

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don't limit component

hi i am making app to control car security system using Arduino. but i get problem hope MIT team limited component to  adding blocks. when i try to compile my app i got error.(please check attachment i added screen shot).  but after i delete few blocks i can compile project. again if i add components to block again can't compile project, same issue. Hope they limited components. please MIT team can you fix this issue we can make good app using your software. thank you very much. 

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hi i am making app to control car security system using Arduino. but i get problem hope MIT team limited component to  adding blocks. when i try to compile my app i got error.(please check attachment i added screen shot).  but after i delete few blocks i can compile project. again if i add components to block again can't compile project, same issue. Hope they limited components. please MIT team can you fix this issue we can make good app using your software. thank you very much.  

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It is not App Inventor that should fix something, you should fix something!
Search this forum for answers: search for DX execution failed

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Can you give us a sense of how large your blocks file is? In the past we've seen that people who build large projects with many if-else blocks rather than taking advantage of mutators can result in the DX step (Android compilation) running out of memory. This might explain why if you add/remove a few blocks it works/doesn't work. Based on your vertical scroll bar my guess is that the project is rather large and may need some optimization for it to work without crashing the Android tools.

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