reading Arduino csv data in app inventor

Hi alacosta Sorry I haven't managed to reply to your comment on my blog, but I was intending to ask you to post this as a new question. Thanks for doing that

A bit more background would be helpful:

1. Are the data items integer or floating point?
2. How often do you want to update the display?
3. What have you tried so far in App Inventor - screen shots of the code blocks.

I'm pretty sure a solution can be found.

Neil

Hi Neil,

First thank you for responding and sorry originally posted in the wrong area ( all new to me ! )

At  the moment the Arduino  system is set to send date to  PC data graphic program which required it to be in CSV format  but if need to be changed to be able to be read via App Inventor that is not a problem.

1. all the data values are integer temperature  readings.

2. Display update ideally auto say every minute or  either by clicking a " Read Button "

3. As I said in my query this is all new to me !  keep checking on  Google etc but  end  up not knowing where to start.

What I would like is basic pointers of code blocks ..... have mastered basic BT connection !

Advice on this would be greatly appreciated

John

Hi John

I think this will get you on the right track. First, a little Arduino sketch to deliver CSV data similar to what you want to do

I don't bother connecting anything tp the Analog input pin - just let it float, it changes randomly. The 4 outputs are made different by dividing by 2,3 and 4.

// Transmit CSV data to serial output for Bluetooth - Android demo
//
// Neil Kenyon
// 27 July 2015
//
const int potPin = A0; 


void setup()
{
  pinMode(potPin, INPUT);
  Serial.begin(9600);
}
void loop()
{
  int potVal = analogRead(potPin); 
  Serial.print("Value 1 = " );      
  Serial.print(potVal);
  Serial.print(",");           
  Serial.print("Value 2 = " );      
  Serial.print(potVal/2);       
  Serial.print(",");           
  Serial.print("Value 3 = " );      
  Serial.print(potVal/3);
  Serial.print(",");           
  Serial.print("Value 4 = " );      
  Serial.println(potVal/4);
  delay(2000);                   
}

Here is a screen shot of the code block I created to read the 4 data items in CSV and display them: I assume you are connecting your Android device happily via Bluetooth to your Arduino.

As you can see, the incoming data is converted into an indexed list and each item is then selected and displayed in its own label.

The clock timer should be set at less than the delay time in the Arduino sketch - I used 1800 mS here and 2000 in the Arduino sketch.

It seemed to work fine for me.

I just noticed you wanted 5 data Items - I will let you modify to meet your precise requirememts

Hope this works for you.

Don't be afraid to ask more questions.

Neil

Hi John

I think this will get you on the right track. First, a little Arduino sketch to deliver CSV data similar to what you want to do

I don't bother connecting anything tp the Analog input pin - just let it float, it changes randomly. The 4 outputs are made different by dividing by 2,3 and 4.

// Transmit CSV data to serial output for Bluetooth - Android demo
//
// Neil Kenyon
// 27 July 2015
//
const int potPin = A0; 


void setup()
{
  pinMode(potPin, INPUT);
  Serial.begin(9600);
}
void loop()
{
  int potVal = analogRead(potPin); 
  Serial.print("Value 1 = " );      
  Serial.print(potVal);
  Serial.print(",");           
  Serial.print("Value 2 = " );      
  Serial.print(potVal/2);       
  Serial.print(",");           
  Serial.print("Value 3 = " );      
  Serial.print(potVal/3);
  Serial.print(",");           
  Serial.print("Value 4 = " );      
  Serial.println(potVal/4);
  delay(2000);                   
}

Here is a screen shot of the code block I created to read the 4 data items in CSV and display them: I assume you are connecting your Android device happily via Bluetooth to your Arduino.

As you can see, the incoming data is converted into an indexed list and each item is then selected and displayed in its own label.

The clock timer should be set at less than the delay time in the Arduino sketch - I used 1800 mS here and 2000 in the Arduino sketch.

It seemed to work fine for me.

I just noticed you wanted 5 data Items - I will let you modify to meet your precise requirememts

Hope this works for you.

Don't be afraid to ask more questions.

Neil

Hi Neil

thank you greatly for your input on this,, has given me a clearer  picture re blocks in Ap 2

I will play with this over the next few days and let you know the outcome.

For me all one big learning curve often needs a door to be opened to see the light

Hi John - you are very welcome.

I look forward to an update

Neil

Hi Neil

just to update and let you see the on going development  from your advice.

Have now been able to develop this further and will be adding more features in the future

Data now life   ... note todays air Temp

again thank you

John

Hi John

Thanks for the feedback looks very impressive - need a spell check on TEMPERATURES..........:

I assume the Water & Panel at the bottom of the display are App Inventor Sliders? Nice use of them.

Glad I was able to help.

Keep up the excellent work and continue to keep up us updated.

Best wishes

Neil

Hi Neil

as a follow on to  previous query, worked on your slider  blog (3 ) all worked  but I need to control 3 sliders to control in Arduino.

have tried extending your initial guide but failing ... basic help / guidance be appreciated

John

Hi John

Glad my slider blog was some help

Probably a good idea if you re-post this question in the slider blog thread and include your App Inventor slider code and the relevant part of your Arduino sketch. I think I developed a 3 slider App which controlled a Tri-colour LED connected to an Arduino. I'll try and find it while you re-post, with your code.

Neil