Calibration

Most sensors came with factory calibration data embedded. Evolve's firmware reads the factory calibration data to provide accurate sensor readings. Some sensors, due to their nature, need to be calibrated periodically. This document describes entering calibration mode and resetting the calibration data to the factory settings.

Prerequisites

• Evolve with all the sensors attached.

• Access to Evolve's on-board "SET" button.

• A fully charged battery.

Calibration Data

Two kinds of calibration data exist. The first one, factory calibration data, is recorded to the sensor and not to be modified. The second one, the correction factor, is recorded in Evolve's configuration.

The correction factor is like fine-tuning a sensor reading and helps to eliminate real-world deviations.

It is the user's responsibility to ensure the calibration steps are applied correctly. Incorrect calibration affects sensor reading and event triggers. There is no way for the device to detect calibration process mistakes.

Setting the Correction Factor

The following procedure will put Evolve into calibration mode.

For each sensor reading, previously prepare a stable lab environment. For example, 25.00°C for the temperature sensor and 50.0% RH for the humidity sensor corrections. Some sensors, like pH probes, have optional multi-point corrections. Refer to the sensor's documentation for those conditions.

1. Disconnect the batteries and other power sources. Ensure the device is in a stable environmental state for at least one hour to stabilize. (Temperature and humidity)

2. Prepare an environment appropriate for the calibration concerning the sensor(s) being calibrated. Refer to the sensors' calibration requirements.

3. While pressing the "SET" button, connect a fully charged battery.

4. After five seconds, the status LED will blink five times, indicating calibration mode entry. Release the button.

5. Quickly click the "SET" button to calibrate the first sensor. The status LED will blink for one long time.

6. Calibration will be made according to the current sensor's calibration requirement. After it finishes, the status LED will blink two times.

7. If your configuration has multiple sensors that support calibration, clicking the "SET" button will proceed with the next sensor. The status LED will blink to indicate the sensor index. e.g., three long blinks mean calibrating the third sensor.

8. When the last sensor calibration is done, the status LED continuously blinks.

9. Disconnect the battery.

10. You may now use the device with the applied correction factor(s).

Disconnecting the battery during the calibration resets the correction factor and does not save any new calibration data.

Resetting the Correction Factor

The following procedure will reset the correction factor.

It is impossible to retrieve the correction factor after a configuration reset.

1. Disconnect the batteries and power sources.

2. While pressing the "SET" button, connect a fully charged battery.

3. After five seconds, the status LED will blink five times, indicating calibration mode entry.

4. Release the button. Sensor calibration data will be erased.

5. Disconnect the battery.

6. You may now use the device with the factory settings.