Programmable DC Electronic Load - Followup

RE: Programmable DC Electronic Load - Followup

fmilburn — Sat, 31 Aug 2019 00:41:40 GMT

There is an interesting discussion on Hackaday about how Arduino code for reading ADC is incorrect for the SAMD21. Basically it attempts to read the ADC before it is finished and ready. I am using the SAMD51 above but need to check if the same error exists there as well.

RE: Programmable DC Electronic Load - Followup

three-phase — Sun, 11 Aug 2019 21:01:13 GMT

Nice summary of your project, I am very guilty of just leaving things and then taking two weeks to try and figure out what I was doing when I go back to the project.

Kind regards.

RE: Programmable DC Electronic Load - Followup

DAB — Sat, 10 Aug 2019 18:19:47 GMT

Good progress.

I look forward to the next post to see your progress.

DAB

RE: Programmable DC Electronic Load - Followup

genebren — Sat, 10 Aug 2019 15:59:16 GMT

Great idea to collect all of your thoughts before you shelf a project for a while, as it is much easier to restart when the time is available. It looks like you did improve a lot of the things that you set out too. Hopefully you will be able to sort out the other things when you restart.

Good work!

Gene

RE: Programmable DC Electronic Load - Followup

Jan Cumps — Sat, 10 Aug 2019 10:26:29 GMT

Design the UI - look at implementing SCPI

Yay!

It helps if you do the two together. It drives you to separate instrument logic from interface logic.

If you design so that the user interface talks to the instrument via an API only, without knowing the internals of the load design, it's easier to get it SCPI-enabled.

RE: Programmable DC Electronic Load - Followup

jc2048 — Sat, 10 Aug 2019 09:58:16 GMT

Good blog - you're making some progress.

The OPA192 op amp is only specced on the datasheet down to 4.5V. It may still work below that, but not necessarily very well.

If you are doing a board layout, you might want to add a gate drive resistor for the MOSFET and the additional external compensation components that MK spoke of in the commments to your last blog. Then you can experiment with them without hacking the board around too much.