B4A Library IOIO board library

gbdroid said:

Thanks Kolbe,
at least it compiles now without errors.
Obviously there has also changed also something with connecting via USB, because my application not gets stuck at "YOY.WaitForConnect()"
If you are interested in how others are using IOIO, have a look at my application attached (I altered only the mobile number), and perhaps have a easy explanation was has changed. But, as already mentioned it is working with lib 1.40 - so I am happy with the actual result.
I had been struggling a lot of time to have the app reacting also when the screen is turned off - my (surely not perfect) solution with a service perhaps of interest for some of you (as to past posts).
By the way: I find it very difficult to sort out the correct syntax from the library documentations (where are the good old times of Commodore PET2001 basic? ;-).
Only making the output "write only" caused this change in syntax?
Why did you make it write only? In a lot of cases it might be usefull to read the output instead of the necessity to use an additional variable.

Edit 14.07.2012:
found the reason for not connecting, correct syntax: YOYO.Initialize (False) 'False is needed for USB connection, True is for BT!

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kolbe said:

I'm curious to how many IOIO users we have? 5?? 10??

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skinner said:

I just got my IOIO board yesterday so add one more to the list.

Is the source code for the library available? (I'm new to b4a so im not sure where to look.)

I found the docs for the 1.5 version but not for the 1.7version. Where can they be found?

Thanks,
Skinner

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Sub flowtick_done(noexceptions As Boolean)

headingwest said:

Hi,

I'm trying to use the DigitalInput.WaitForValue which goes to an event. But I get the following error:

java.lang.Exception: Sub flowtick_done signature does not match expected signature.

B4X:

Sub FlowCountSub
   pinFlowmeter.waitForValue("flowtick", True )
End Sub

'Event to handle the pulse
Sub flowtick_done(noexceptions As Boolean, list1 As List, Available As Int, Overflow As Int)
   lFlowCount = lFlowCount + 1
   pinFlowmeter.waitForValue("flowtick", True)
End Sub

Any ideas? Is my event_done structure correct?

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gillano said:

got it to compile and run but it pauses on the line

in = IOIpenDigitalInput (37, in.IP_PULL_DOWN)

still not sure how to make this work as a "Button_Down"

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headingwest said:

Hi All,

I wanted some ideas for a pulse input counter with the IOIO library.

I have a hall effect device which will send a 3.3v or 5v pulse at varying intervals. The pulse is activated on each rotation which measures rotational speed. I need to count the pulses. Accuracy only needs to be average. The counting is while doing other things with the IOIO. So I'm opening and closing pins etc, but in the background I need to count the pulses.

If I use the DigitalInput.WaitForValue event
- will it block the rest of the program?
- Or does it just sit there and wait for a pulse? Which I can increment a counter.
- If I raise the .WaitForValue event within the event itself, how frequently will it count?

Any other ideas or thoughts on the best way to do this?

Thanks.

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Kbogle24 said:

I cant wrap my head around this, can someone please help me. I followed this step by step diy on using the ioio with a motor driver breakout board.

Connecting DC motors to the IOIO through the TB6612FNG, a motor driver break out board | Jay Chakravarty

I have everything done but the software. His code was written in java. This is what I wrote for b4a. I cant seem to get it working. Any Ideas?


I am using the newest ioio lib. Which I have noticed that when using the .write command true is off and false is on. Is this right?

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Sub Process_Globals
   'These global variables will be declared once when the application starts.
   'These variables can be accessed from all modules.
   Dim YOYO As IOIO
   Dim Pwmb As PwmOutput
   Dim STBY_PIN As DigitalOutput 
   Dim BIN1 As DigitalOutput
   Dim BIN2 As DigitalOutput
   
End Sub

Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.
 Dim MotorFWD As Button 
End Sub

Sub Activity_Create(FirstTime As Boolean)
         YOYO.Initialize(False)
         YOYO.WaitForConnect()
         MotorFWD.Initialize ("motorfwd")
         Activity.AddView (MotorFWD,20,20,100,100)
      
         Pwmb = YOYO.OpenPwmOutput(45,Pwmb.OP_NORMAL,100)
         STBY_PIN = YOYO.OpenDigitalOutput (42,STBY_PIN.OP_NORMAL,True)
         BIN1 = YOYO.OpenDigitalOutput (43,BIN1.OP_NORMAL,True)
         BIN2 = YOYO.OpenDigitalOutput (44,BIN2.OP_NORMAL,True)
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub
Sub motorfwd_Click()

         Pwmb.DutyCycle = 1.0
         BIN1.Write = True
         BIN2.Write = False

End Sub

kolbe said:

Ok here's some ideas that might help.

At some time after the activity_create, check to make sure you have a connection to the IOIO. Check the state of the IOIO.

You set the PWM to 100Hz, should work but the board works up to 100kHz. Is there a recommended frequency?

The batch only works with writes, I'm not sure if your dutycycle call will do anything.

I don't think you really need to use the batch function. To simplify and debug just set one of the pins to false because you init both pins to True. You can test this with a DMM.

Vcc should be 3.3v not 5v. The digitalout should be 3.3v when HIGH or True, 0 when LOW or False. Test this first without the motor driver connected. If you find different behavior when connected you have an electrical problem, drawing to much current etc.

Your standby should be init to True.

Don't connect the Motor V+ to the IOIO unless you are absolutely sure they never max out the current sourcing ability of the IOIO (stall current is usually a problem). This will at best cause weird IOIO behavior, at worst fry your IOIO.

Click to expand...

kolbe said:

Do you have it working?

From your previous posts... I wouldn't put this code in the create method, it will only get run once. I usually check for a connection to the IOIO in the resume method. If none is detected then I create one. In my apps the work part of the IOIO code is usually event driven by a timer, scheduled process, button, etc.

If you are still having problems post some current code... explain fully what you are trying to do.

Click to expand...

'Activity module
Sub Process_Globals
   'These global variables will be declared once when the application starts.
   'These variables can be accessed from all modules.

End Sub

Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.

   Dim Label1 As Label
   Dim Pulse As Button   
   Dim Reset As Button
   Dim Label1 As Label
   Dim Addition As RadioButton
   Dim Subtraction As RadioButton
   
   
End Sub

Sub Activity_Create(FirstTime As Boolean)
Activity.LoadLayout("testscreen")
End Sub

Sub Activity_Resume

Dim IOIO As IOIO
Dim PulseIn As PulseInput
PulseIn = IOIO.OpenPulseInput (31,PulseIn.IP_FLOATING,PulseIn.RATE_16MHZ,PulseIn.NEGATIVE , True)

Dim Add1 As DigitalInput
Add1 = IOIO.OpenDigitalInput (34, Add1.IP_PULL_UP) 

Dim Subt1 As DigitalInput
Subt1 = IOIO.OpenDigitalInput (35, Add1.IP_PULL_UP) 


End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub Pulse_Click
Dim P As Int

If Addition.Checked = True Then 
P= Label1.Text+1
Label1.Text = NumberFormat (P, 1, 0)
End If


If Subtraction.Checked = True Then
P= Label1.Text-1 
Label1.Text = NumberFormat (P, 1, 0)
End If

End Sub
Sub Reset_Click
Label1.Text = "0"

End Sub


Sub Exit_Click
Dim Result As Int
Result = Msgbox2 ("Are you sure?", "Exit", "Yes", "No", "", Null)
If Result = DialogResponse.Positive Then
ExitApplication

End If
End Sub