WCWH Rollout Pre-Calibration

[HagenFritz]

Prior to deployment, the 20 beacon with working software and hardware need to be calibrated. This issue will serve as a place to write-down updates on these efforts.

Hardware

The beacon hardware has been properly installed but we first need to check that no new bugs have cropped up since the installation.

Software

Many of the beacons are still running on older software from utx000 so this needs to be updated prior to calibration.

Final Inspection

After the hardware and software checkout, we should let the devices run for at least 24 hours to make sure that they are measuring regularly and have no further issues.

Metrics

Based on this article some important metrics to consider are:

• correlation coefficients: We want a correlation coefficient close to 1
• slope and intercept: To minimize over/underfitting we want m = 1 and b = 0
• error estimates: mean bias error (MBE) represents the tendency for the sensor to over/under estimate the reference concentration, mean absolute error (MAE) corrects for positive/negative values that would cancel themselves out in the MBE, and root mean square error (RMSE) represents how narrow the error distribution is by penalizing large measurement errors.

Visualizations

Again borrowing from this article, we should visualize the beacons' performances by comparing:

1. Time series of measurements (before and after correcting)
2. Scatter of measurements (before and after correcting - might need to be two plots)
3. Histogram of measured to reference concentrations

Testing

• 01
• 04
• 05
• 07
• 10
• 12
• 15
• 16
• 17
• 21

Needs Repair

• 02 - SPS30
• 18 - Light, SPS30, and SCD30

[HagenFritz]

Beacon 1 - Hardware and Software check out - currently monitoring for 24 hours