# Development Notes Here you can find some application / development notes. Most development notes were developed in-house, to be able to implement data processing, or tweak sensor operation parameters. ## Noise - [Noise and DSP calculations](https://docs.smartcitizen.me/assets/notes/noise-dsp.pdf): a description of the math behind the noise calculations in the SCK. - [Noise sampling](https://docs.smartcitizen.me/assets/notes/noise-sampling.pdf): an evaluation of how significant sampling every 1' is with 23ms of data, versus other approaches. ## PM Sensors - [PMS5003 sampling time](https://docs.smartcitizen.me/assets/notes/one-shot-pmsx003-analysis.pdf): PMS5003 tests to determine the sampling interval. ## Alphasense sensors - [Alphasense AN803-04 for zero-offset calculation](https://docs.smartcitizen.me/assets/notes/alphasense-an-803-04-zero-offset.pdf) - [Alphasense ISB User manual](https://docs.smartcitizen.me/assets/notes/alphasense-isb-user-manual.pdf)