Hi together, I have very elementar project, measuring temperature by SHT31 (I2C) and advertising measured value via BLE at XIAO nRF52840. Im using ArduinoBLE.h library and powering that from one 18650 via battery pads. Everything works fine except of power consumption - minimum I got is some 6mA, w…

You might find the link below helpful. [image] System_ON_Sleep of XIAO BLE XIAO System_OFF_Sleep (Deep Sleep) is used to significantly reduce current consumption, but requires an external trigger for wake-up. On the other hand, System_ON_Sleep can easily woken…

Use a proper low-power library, such as Adafruit SleepyDog or Nordic’s sleep APIs, instead of relying on delay().

delay(10000) only pauses the sketch; it does not guarantee that the MCU and peripherals enter a low-power state. The 6 mA baseline therefore suggests the processor, USB stack, onboard flash, LED, or another peripheral remains active. I would first test Seeed’s low-power example using the Seeed nRF5…

Hi There And welcome here…SO, Radek Jovelyn is absolutely right on the money here! It is a very common trap. Using the standard delay(10000) just pauses your sketch while leaving the main CPU spinning its wheels in a high-power active state. While the Nordic SoftDevice is incredibly efficient at …

There’s been some debate that delay() doesn’t reduce current consumption, but in my experience, using delay() has reduced current consumption down to the microampere range. Please take a look at the current waveform in Post #1 below. The sections labeled “Sleep” are where I used delay(). …

Guys, I have experimented with tips you provided me three days (and nights :slightly_smiling_face:) without significant success. Still around 5mA of consumption. Then I asked my AI friend Gemini and he solved it in 3 seconds. He proposed me raw structure of Arduino sketch with Bluefruit library. I j…

HI there, Awesome, You got it going, Would you post the code? Use the code tags above “</>” :backhand_index_pointing_left: :wink: paste it in there. I would be interested in seeing what it suggested , Was it boiler plate or some custom creation we may all benefit from? The contribution is appre…

Xiao nRF52840 still too high consumption

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msfujino July 21, 2026, 10:43pm 2

You might find the link below helpful.