Raspberry Pico as USB test device - part 3: add an additional SCPI query to get switch state

RE: Raspberry Pico as USB test device - part 3: add an additional SCPI query to get switch state

Jan Cumps — Sun, 05 Feb 2023 00:15:52 GMT

Using the LabVIEW VI driver I made for a similar design on a Pi (SCPI call compatible):

[View:https://youtu.be/vEwMu3jCq38:1280:720]

I didn't change any part of the LabVIEW flow or code, just selected the Pico from the VISA selection box.
It popped up in the values because the instrument implements the USBTMC profile.

All VI blocks just worked.

RE: Raspberry Pico as USB test device - part 3: add an additional SCPI query to get switch state

Jan Cumps — Sat, 04 Feb 2023 19:32:38 GMT

Food for thought:

The lab switch is limited to the amount of GPIOs the Pico has.
If you need a vast switch device, you could use a set of I/O port ICs with i2c (or other) interface (I use an NXP PCA9557 for the SCPI eLoad).

An additional advantage is that you can then use an i2c isolator, and have galvanic isolation between the Pico (and its USB and the computer connected to it!) and the test circuit.