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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@sebi
The 8s interval spikes (see above post) might be due to Espruino or Puck.js's hardware themselves as they don't occur when running the OpenHaystack (ultra low power) alternative firmware on a nRF51822 (see measurement N51-XTAL-LDO in this post on GitHub).
Note that, despite those 8s interval spikes, it seems the nRF52832 is more power efficient than the nRF51822 (6.30uA vs 7.60uA).
There is no external low-frequency 32,768kHz crystal available on the Puck.js, thus the internal low-frequency RC oscillator used instead that requires regular clock calibration, might be responsible for the 8s interval spikes. On the nRF51822, clock calibration when using the internal RC circuit seems to be more erratic though (see measurement N51-RC-LDO).