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Best way to read data from Sensor [message #1732783]

Fri, 20 May 2016 01:13

Jatinder Arora

Messages: 1
Registered: May 2016

Junior Member

Hi All,

I have observed that Pi4J is the recommended way to read data from Sensor and further perform any action on that data in the Kura framework.

Being a Java developer, I strongly feel that pi4j is not best fit all the times for reading data from various sensors. For example: Reading humidity and temperature from DHT 11 sensor.

Keeping above in mind, I have following queries:

1. Is it a good practice to read data from sensor using the language suitable for that particular sensor. For example: C or Python and then share the data with the Java file in Kura framework for further action ?

2. If answer to above is yes then what is the best way to perform it. I can think of couple of ways like a) Store sensor data in file system and read data from file system in java file b) Runtime.exec() in java thus executing python script using java.

Please guide. Thanks in advance.

Regards,
Jatinder

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Re: Best way to read data from Sensor [message #1732990 is a reply to message #1732783]

Mon, 23 May 2016 14:49

David Woodard

Messages: 420
Registered: July 2014

Senior Member

Hello,

Where have you observed that Pi4J is the recommended solution for reading sensor data? The greenhouse demo uses this approach, but it needs to be updated. It was developed before we were including jdk.dio within Kura. The recommended approach for reading sensor data in Eclipse Kura is jdk.dio.

If your sensors are connecting over standard interfaces (I2C, GPIO, etc.), I would follow this documentation [1][2]. Eclipse Kura has services setup specifically for GPIO and expose the jdk.dio APIs for I2C. In some cases, sensors do require specific lower level code to interact with the sensor. In these cases, I would use JNI to act as a bridge between the low level code (i.e. C) and Java. Let me know if you need more direction on how to do this.

[1] http://eclipse.github.io/kura/doc/kura-dio-apis.html
[2] https://esf.eurotech.com/docs/how-to-use-gpio

Thanks,
--Dave

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