Spectral Triad (AS7265x) - No Response Using Serial AT

Sensors Imaging
1

Hi folks,

I am attempting to use the AS7265x with the SparkFun Serial Basic Breakout - CH340C and USB-C.

I am seeing both the red PWR and blue STAT LEDs on solid. No other LEDs are on and there is no response from the Serial Terminal. Things I have done:

  • Cut the I2C Pull Up jumpers on the PCB top (per the Hookup Guide) to use UART mode

  • Applied a solder bridge for JP2 on the PCB bottom (also per the Hookup Guide) for UART mode

  • Left the Serial Basic Breakout in the default 3.3V configuration

  • Configured the Serial Terminal for 115200, 8N1 settings (per the Datasheet and Hookup Guide)

  • Tested the Serial Basic Breakout by using a loop back jumper wire and verified the Serial Terminal and Serial Breakout are working

  • No AT commands are working at all, there is absolutely no return for any of the AT commands (followed by CR/LF)

  • Did not test I2C since my application is not I2C and I don’t have an easy way to test that right now

    • The version number on my board appears to be v10 (which I think is the only version available anyway).

    What tests can I perform to see what might be wrong? Could I have a bum board and should return this one?

    Many thanks, and best!

    Eric

    2

    Hi, I think it will be better if you please share your connection diagram.

    3

    Good day folks,

    Thank you tepalia02 for the suggestion to include a connection diagram. That is a good idea and I will include that for future posts.

    It is working now. With all due chagrin I will let you, dear readers, know what was wrong.

    I am using Serial Debug Assistant (from the Microsoft Store). I have used it many times in the past but always in Hex send/receive mode. This time of course requires ASCII mode. I made the bad assumption, based on me hastily reading the dialog box settings, that a CR+LF was sent automatically with a sent message (you click a button to Send). Reading more carefully there is no reason to expect the CR+LF comes without entering them (e.g., by hitting the Enter in the text to send text field).

    I was not hitting the Enter key to insert the CR, so it was never getting sent with the AT*** command. As soon as I added that, everything started working exactly as expected.

    I have already collected some data and the device is working well I would say and is enjoyable to use.

    Best!

    Eric