sebi

@mowtschan Could you tell me what multimeter you are using? I am looking for one that can measure low currents (uA, nA) and was wondering if yours could do the...

@acalatrava @mowtschan I would like to point you to [that video](https://www.youtube.com/watch?v=LUB8RWzzLWc) that focuses on measuring tiny currents. In a nutshell, it says that a standard multimeter won't do the job...

I just measured the consumption of OpenHaystack (ultra low power) alternative firmware on an **nRF51822** board equipped with a low frequency **crystal** ([Holyiot YJ-14001 BLE module](https://www.aliexpress.com/item/1005002787181715.html)) using my freshly received...

To compare current consumptions, I compiled the OpenHaystack (ultra low power) alternative firmware firmware for my [Holyiot YJ-14001 BLE module](https://www.aliexpress.com/item/1005002787181715.html) (nRF51822) using the internal RC oscillator instead of the low...

I measured the consumption of OpenHaystack ultra low power alternative firmware on an **nRF52832** board equipped with **NO external low frequency crystal** ([Holyiot YJ-17095](https://www.aliexpress.com/item/32864571031.html)): This board's hardware is similar to...

@acalatrava: If you send me firmwares for nRF52832 with NO crystal you are developing to solve this consumption issue, I can patch them with my advertisement key, test them and...

@acalatrava: BTW, did you enable the built-in DC/DC regulator to save some energy (if the boards support it)? See [this explanation](https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fpower.html&cp=4_2_0_17_0&anchor=topic) and [this schematic](https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fref_circuitry.html&cp=4_2_0_52_1&anchor=schematic_qfn48_dcdc). [Here](https://www.programmersought.com/article/18503111047/) someone claims enabling the DC/DC...

# Average Power Consumption (in uA @ 3V) I compared the power consumption of my [Holyiot YJ-14001 BLE module (nRF51822)](https://www.aliexpress.com/item/1005002787181715.html) with different settings: | Low-Frequency Oscillator / Internal Power Supply...

An additional comment: Not all [AliExpress beacons](https://www.aliexpress.com/item/32826502025.html) are populated with the low frequency external crystal. Check it out before enabling the external low-frequency 32.768 kHz crystal.

Note the 4s interval spikes due to the clock calibration involved when using the internal low-frequency RC oscillator (see figure **N51-RC-LDO** blue rectangles) (orange rectangles correspond to 5s interval broadcasting...