Once your project starts to grow it’s common to have multiple different sensors, from different vendors, measuring the same environmental parameter. Ideally, those sensors would produce the same readings in the same environment – but in practice there are significant offsets. The Cave Pearl Project writes:
Sensors like NTC thermistors are relatively easy to calibrate using physical constants. But finding that kind of high quality benchmark for barometric sensors is challenging if you don’t live near a government-run climate station. So we typicallyuse a normalization processto bring a set of different sensors into close agreement with each other. This is a standard procedure for field scientists, but it’s hard to find because the word ‘normalization’ means different things in various industry settings. In Arduino maker forums it usually describes scaling the axes from a single accelerometer with (sensor – sensor.min )/( sensor.max – sensor.min ) rather than standardizing a group of sensors.
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