Calibrate Sensors using the Ethernet Hardware Application (EHA)
Calibrate a Sensor
- If you want to calibrate a sensor then click on the Sensors button. A window with a list of sensors should be displayed See the EHA Sensors Tab image below.
- Find the name of the sensor you wish to recalibrate and click on it to select it.
- In the Output section of the window click the Reset Min Max button.
- Move the sensor to its maximum and minimum position a couple of times to find the maximum and minimum raw values.
- Take note of the shape of the sensor graph.
- Click the Use Min and Max As First And Last Coordinates button.
- Make sure the shape of the graph hasn’t been reversed.
- You can move a coordinate around by pointing at a coordinate with your mouse cursor and then clicking and holding the left mouse button while you move the mouse around.
- To add a coordinate, hold in the Ctrl button on the keyboard and single left click anywhere on the graph.
- Click the Update to Console button so that the red dot which denotes the actual raw value follows the graph correctly.
- To recalibrate another sensor, select it from the list by clicking on it.
In
most cases the calibration for a sensor should be such that the minimum raw
value should correspond to a scaled value of 0 and the maximum raw value should
correspond to a value of 1. This can be reversed, depending on the sensor. If
the sensor is behaving opposite to how it should, then switch the calibration
for that sensor so that the minimum raw value corresponds to a scaled value of
1 and the maximum raw value corresponds to a scaled value of 0. This can be
done by clicking on the points on the graph and editing the Y(Scaled) values in
the text box in the bottom right hand corner of the window.
It is also important to make sure that the scaled values for your minimum and maximum points are exactly 0.0 and 1.0. If these numbers are not exact it could cause erratic behaviour in the simulations.
If the sensor is noisy, i.e. the red point on the graph moves around without you moving the sensor, then it may become necessary to add dead zones. Dead zones ensure that the sensor will not be picked up as being activated by the operator due to noise on the system. To add a dead zone, add a coordinate to right of your left most coordinate and another to the left of your right most coordinate (see instruction 3.7 on adding coordinates. Again, ensure that the scaled values for your minimum and maximum dead zone points are exactly 0.0 and 1.0. If these numbers are not exact it could cause erratic behaviour in the simulations.
Try
to keep the dead zones as small as possible. The EHA Sensors Tab image shows an example
of dead zones.
Images
EHA Sensors Tab
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