EEZ Bench Box 3 (BB3)

[prasimix]

You can now follow @Jan28's progress with the electronic module in the BB3 EEZ-DIB form factor also on GitHub: https://github.com/fietser28/EL-Load

Fantastic work!

[prasimix]

@goran.mahovlic from Intergalaktik.eu finalized STM32H7 module in CM4 form factor for BB3-CM4 module. Project is now available on GitHub: https://github.com/intergalaktik/bb3-cm4/tree/main/EEZ_BB3_CM4_H7

[Lion_Tamer]

Hi All

I am finally getting round to finishing the assembling of some more modules for my 2nd BB3 and have one that ia throwing an error message, I haven't managed to find a list of the possible error codes and explanations anywhere so thought I would ask on here.

The module in question is a DCP405 R3B3 and the message that I am getting is is "Ch1 IOEXP fault match detected" with a continuous rapid beeping and inability to close the message, this has also sometimes caused the BB3 to enter and exit standby repeatedly even though the power on self checks come back as okay.

Does anyone know what the code set criteria is for this fault code? I assume that it is one or more of the input signals to IC14 that it is moaning about but not sure which one.

For info incase it matters - I am using an R3B3 MCU with firmware V1.7.6

Thank you

Jem

[prasimix]

Check if your PCB has JP2 on bottom side, and if yes then cut it and check once again. Be also sure that I/O Expander IC is soldered correctly.

[Lion_Tamer]

Yes I had JP2 on the bottom - I have another 3 of these modules to complete - will I need to cut it on all of them?
The soldering on the IC looked okay but when I tested between adjacent pins there was a short between pins 1 (~set_DP) and 2 (OE) - must have been a really small whisker as I still couldn't see it at 30x magnification - Looks like my next investment might have to be a microscope.

[prasimix]

You can cut JP2 if you wish, that is RESET line that comes from MCU and in some rare situation could generate instability hence it's removed in the latest revision.

[IanJ]

Hi,

Really like the retractable feet on my BB3 and want to use them on a home made design for something else......where can I get them?

BOM just says:
A-951-A-0-G-0
Adjustable feet (pack of 2) Altinkaya, Turkey

Ian.

[HwAoRrDk]

These?

https://www.altinkaya.eu/shop/a-951-tilt-foot-set-4pcs-set-729#attr=1072

It seems you can buy direct.

[PlainName]

Sorry for necro post - if there is a better place I couldn't find it (which probably attests to the robustness of the BB3!).

Got a BB3 with two DCP405 modules. One of them I've been using at 5V for a while (albeit on and off) and today I am using the other one at 12V. A bit earlier I noticed the CC LED of the unused module flickering slightly, and it's got worse until now it is on constantly. The output is not turned on, but if I do turn it on the LED goes out,.

Turning the 12V module on or off doesn't affect the LED, and the CC LED on that channel doesn't come on when the output is off.

Is this something I should be getting worried about?

[prasimix]

What is the version of your DCP405 module: r2B11 (green PCB) or r3B3 (blue PCB)? The later is better produced and generally you shouldn't be concerned about this behavior.

[PlainName]

It is an original green, as supplied with your two-channel kit in 2020 (gosh, that's years ago). I'd love to have another box to put around a blue one (or two), but cost of living has trumped that idea so far

Glad to know it is ignoreable, at least for now.