Quanser Mechatronics Sensors Trainer USB Light Dependent Resistor Page

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The Quanser Mechatronics Sensors Trainer USB Light Dependent Resistor Page plots the voltage produced by the Advanced Photonix OPT-PDV-P8104 light dependent resistor (LDR) sensor in Volts. The resistance decreases as the light level increases. The voltage ranges from 0.0 to 3.3 volts. The page is displayed below with a sample plot, showing the light dependent resistor voltage in red.

Quanser Mechatronic Sensors Trainer USB Light Dependent Resistor Page

To go back to the Sensors page, tap on the close button in the top, right corner of the page. To change the sensor parameters, tap on the hamburger menu in the top, left corner of the page. This will open the settings screen described in the section below.

The voltage is read using a 16 bit ADC. The same ADC is shared with force sensing resistor (FSR). The plot axes are fixed.

Settings

The settings page is illustrated below. Note that this settings page is shared with the force sensing resistor.

Quanser Mechatronic Sensors Trainer USB FSR and LDR (ADC2) Settings Page

Since analog measurements can be noisy, the ADC supports oversampling of the signal. The Oversampling parameter allows the desired oversampling to be selected, from 32X to 1024X oversampling. Higher oversampling will reduce the noise but will add more lag to the measurement. Changing the oversampling will affect the force sensing resistor as well.

Tap the close button in the top, right of the page to apply the new settings and return to the plot.

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