Programmable Electronic Load - Java GUI Part 1: Basic Functionality

RE: Programmable Electronic Load - Java GUI Part 1: Basic Functionality

Jan Cumps — Sat, 06 Jul 2019 12:42:23 GMT

The app now is usable:

[View:https://www.youtube.com/watch?v=RvEYq_lwDNo:1110:699]

LCD display works. Shows mode, status, set value, measured current and voltage.
Input on/off button
Set constant current
Error logging. Button turns red and shows error count. Clicking the button retrieves the errors.
Clicking the button when it's green (0 errors waiting) clears the log
SCPI command inteface to second tab.

You can see a bug in the resize logic. By accident I let the LCD screen resize vertically. It should be the Error Log that resizes. I've fixed that.

RE: Programmable Electronic Load - Java GUI Part 1: Basic Functionality

DAB — Fri, 05 Jul 2019 20:24:32 GMT

Nice post.

The process looks straight forward.

DAB

RE: Programmable Electronic Load - Java GUI Part 1: Basic Functionality

Jan Cumps — Fri, 05 Jul 2019 16:49:37 GMT

I added synchronisation to the instrument request - rponse:

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=java&text=++++private+void+jButtonSCPISendActionPerformed%28java.awt.event.ActionEvent+evt%29+%7B++++++++++++++++++++++++++++++++++++++++++++++++%0A++++++++String+s%3B%0A++++++++synchronized+%28instrument%29+%7B%0A++++++++++++instrument.write%28jTextFieldSCPICmd.getText%28%29+%2B+%27%5Cn%27%29%3B%0A++++++++++++s+%3D+instrument.read%28%29%3B%0A++++++++%7D%0A++++++++jTextFieldSCPIReply.setText%28s%29%3B%0A++++%7D+++++++++]

This avoids that there's a command sent to the instrument while I haven't finished reading the previous reply.

There's room for improvement here, but this is the simplest way I could see this happening.

I think it 'll do for this application and prevents that I have to do puzzling with the reply. I know no new command will be sent before I have the chance to read the previous reply.

It's my responsibility to optimise the time spent in a single conversation and keep out any logic that does not have anything to do with the interaction with the load....

RE: Programmable Electronic Load - Java GUI Part 1: Basic Functionality

ralphjy — Fri, 05 Jul 2019 14:50:25 GMT

Nice clean interface. A couple of thoughts - It might be useful if the log window would display command and response history in addition to errors and have a scrollbar to peruse it. And it would be nice if the command entry box had a pulldown to enable repeating a previous command. Haven't used Swing. It's great that it is a cross platform implementation.

RE: Programmable Electronic Load - Java GUI Part 1: Basic Functionality

genebren — Fri, 05 Jul 2019 14:47:03 GMT

Jan,

The interface is looking pretty cool. I really like how your windows resize so nicely.

Keep up the good work!

Gene