current measurement with an external accelerometer.

[Lei]

Hello there,

I know how to measure the current based on Nordic tutorial. However, if I connected an external accelerometer by connecting Vdd and Gnd from nordic ev kit to accelerometer ev board, the current consumption from external accelerometer could not be measured/reflected with ampere meter. I wonder if there are other VDD on nordic 51832 ev board can be used to power external sensor and count the current consumption into current measurement (ampere meter).

Thanks,

-Lei

[Simonr]

Hi

Just to clarify. Your accelerometer works as intended, correct? At first, I thought you were struggling to get it up and running, but it seems like you are only struggling to measure its current consumption, am I right?

The VDD_nRF pin on P22 is only the current to the nRF chip, which explains why you don't see a change in the current when connecting an external accelerometer. To measure the current draw of the accelerometer you should place the ampere-meter in series with the accelerometer to get an exact look at the accelerometer current consumption.

Best regards,

Simon