Regarding DMM Shield Compatible Boards

[Dilum Fernando]

Hi !!

In your Website under "Arduino DMM Shield Library User Guide"(https://reference.digilentinc.com/reference/add-ons/dmm-shield/arduinolibraryuserguide) it is mentioned that DMM Shield works with 16 bits AVR boards like Arduino UNO and Arduino Mega 2560.

But I can not find 16 bits Arduino UNO and Arduino Mega 2560 AVR boards in market. According to the Atmega specifications both Arduino UNO and Arduino Mega 2560 have 8-bit AVR Microcontrollers. 

Will this DMM Shield support with existing 8-bit AVR Microcontrollers of Arduino UNO and Arduino Mega 2560???

Further, screenshot of your web is attached below for your reference. 

Quick response regarding this is highly appreciated!!! (Because I need to purchase this DMM shield as soon as possible ?)

 

Thanks,

Dilum.

[attila]

Hi @Dilum Fernando

I've moved you question to a more appropriate forum.

[JColvin]

Hi @Dilum Fernando,

This is a typo in the documentation as you are correct that 16 bit versions of the Arduino UNO and the Arduino MEGA 2560 do not exist. I'll work on getting this corrected in our documentation.

I did check through the files on our GitHub, https://github.com/Digilent/Arduino-DMMShield-Library, and it seems that 8-bit values are used consistently throughout.

Let me know if you have any questions.

Thanks,
JColvin

[Dilum Fernando]

On 12/22/2020 at 3:47 AM, JColvin said:

Hi @Dilum Fernando,

This is a typo in the documentation as you are correct that 16 bit versions of the Arduino UNO and the Arduino MEGA 2560 do not exist. I'll work on getting this corrected in our documentation.

I did check through the files on our GitHub, https://github.com/Digilent/Arduino-DMMShield-Library, and it seems that 8-bit values are used consistently throughout.

Let me know if you have any questions.

Thanks,
JColvin

Dear Colvin,

Thank you very much for your attention . Anyway I  have purchased DMM shield. It seems perfect for my work. But I need to know about J1 Frequency jumper. Do I need remove it or connect it always?? (I just want to measure only the voltage)

Thanks,

Dilum 

[JColvin]

Hi @Dilum Fernando,

Jumper JP1 (the frequency measurement jumper) is not implemented so you can leave it connected or disconnected as you please.

Thanks,
JColvin

[MaxWilko]

Hi there,

I wanted to purchase a digilent 410-356 DMM sheild for arduinos.

I just need to know two things before purchase;

1st: Can I measure two voltages simultaneously using the same ground? (both voltages will read between 0V-5V).

2nd: Ideally I would have the voltage reading with 4 decimal points, 3 would be acceptable however. Does it have enough resolution to do so on a Arduino Mega2560?

Thanks for your help!

[JColvin]

Hi @MaxWilko,

As far as I know the DMM Shield is no longer available for purchase and has not been available for some time, or at least that is what I have been told (I'm going to update it's Resource Center since it currently only says that it "The DMM Shield is no longer in production and once current stock is depleted, it will be retired." but it's stock has been depleted for awhile). What this means for end customers that active support for this product will be limited at best.

1) No, because there is only a single input for measuring voltages.

2) Maybe? The stated resolution in the specification section of the reference manual, https://reference.digilentinc.com/reference/add-ons/dmm-shield/reference-manual#specifications, is "5 1/2 Digit" (I imagine Digit in this case means significant figures) with an accuracy of +/- 0.1% for the voltage measurements. The resolution is not more definitive because the range for the DMM Shield is from -50 V to +50 V, with selectable smaller ranges, and then a calibration procedure after setting up the ranges, so there isn't a consistent quotable value. With a small voltage range, https://reference.digilentinc.com/reference/add-ons/dmm-shield/reference-manual#measurement_scales, you could probably get the decimal resolution you are looking for (presuming a small voltage range) with the 4 or 5 significant figures that are available. The resolution is specific to the DMM shield itself so any system board that communicates with it (Digilent system board, Arduino, etc), will have the same resolution available.

Thanks,
JColvin