Android Question [things] I2C

Michael1968 · Jan 22, 2017

Hi Erel,

is it possible to add I2C Support to the "Things" library ?

THX
Michael

tigrot · Jan 22, 2017

I don't think possibile without additional hardware. B4A supports only Android supported hardware. You can look for modules supporting this modality. Arduino is a possibility...

tigrot · Jan 22, 2017

But you must be skilled in intagration...

Erel · Jan 23, 2017

@tigrot see this tutorial: https://www.b4x.com/android/forum/threads/74821/#content

You can access the I2C API with JavaObject:

B4X:

Dim jo As JavaObject = Manager
Log(jo.RunMethod("getI2cBusList", Null))
Dim Name As String = "..."
Dim Address As Int = ...
Dim device As JavaObject = jo.RunMethod("openI2cDevice", Array(Name, Address))

'Now call I2cDevice methods:
Dim buffer(100) As Byte
device.RunMethod("read", Array(Buffer, Buffer.Length))
Dim data As Byte = ...
Dim reg As Int = ...
device.RunMethod("writeRegByte", Array(reg, data))

Michael1968 · Jan 23, 2017

Hi Erel,

I get this error:

** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
Error occurred on line: 31 (Main)
java.lang.RuntimeException: Object should first be initialized (PeripheralManager).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:50)
at b4a.example.main._activity_create(main.java:382)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:708)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:337)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:247)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at b4a.example.main.afterFirstLayout(main.java:102)
at b4a.example.main.access$000(main.java:17)
at b4a.example.main$WaitForLayout.run(main.java:80)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
** Activity (main) Resume **

get the same error with the PWM example.

if i use b4j with Linux Image on the Pi, i2c works well.

Erel · Jan 24, 2017

You should first initialize it.

Start with this example: https://www.b4x.com/android/forum/threads/android-things.74823/

rwblinn · Jan 24, 2017

Pls find an I2C example attached.
The BH1750 Digital Light Intensity Sensor is directly connected to the Raspberry Pi. Read the source for details. incl. pin mapping.

Michael1968 · Jan 24, 2017

Hi Rob
thank you
with your help I get a WEMOS SHT30 Digital Temperatur & Humidity Sensor running

best regards

Michael

rwblinn · Jan 25, 2017

Great to see working.

Would it be possible to share the code for your solution?

Michael1968 · Jan 25, 2017

the working I2C example attached.
The SHT Sensor is directly connected to the Raspberry Pi.
Thanks to Robert ,he wrote most of the Code, to help me to get it work

best regards

Michael

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