B4J Question Data acquisition with Raspberry Pi

[Mark Read]

I am looking to built a data acquisition system for a sensor. The whole system needs to be hand-held as my laptop solution is too cumbersome. The hardware comprises:

Gill Instruments Wind Sonic Sensor for wind speed and direction mounted on a track.
Raspberry Pi with 5" TOuchscreen and Raspian from Noobs.

The sensor is connected via a RS232 port and delivers every second the "string" eg.

<STX>Q, 229, 002.74, M, 00, <ETX> 16 where 229 is the direction from North and 002.74 the speed in m/s. It is possible to read data with hyperterminal but I would like a UI.

I need a simple UI with a Start/Stop button, an edittext field for filename (or I could use a date/time stamp) and two labels for the values. No other graphics are required. The data should be saved to a text file to be processed later (date, time, direction, speed).

I have no experience with B4J but have been going through the examples.

Is my idea possible with B4J? Has anyone any advice. Should I also use a serial board on the Pi as the Pi uses 3.3V as far as I know and a normal Com port 5V?

I would be grateful for any help or hints how to proceed.

 

[Erel]

Yes, it is possible. You can use the jSerial library together with asyncstream to read the data.

You have two options for the UI:
1. Use Java 8u6: https://www.b4x.com/android/forum/t...b4j-from-the-scratch.59784/page-2#post-382028
This is the last version that supports JavaFX on ARM boards. You will need to use SceneBuilder to make the layout.

2. Create a WebApp that handles the data. You will be able to connect to the server with any browser (including the local browser). I think that this is the better option.