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| − | <p align="center"> To demonstrate that the device works, a bacterial growth experiment was performed using the constructed device to detect the changes in turbidity that occurred due to the bacterial growth. As the bacteria grow and the solution becomes more turbid, more light is attenuated as it passes through the sample in the well. The transmittance of light that reaches the photo-diode is therefore decreased and this decrease of light causes the photo-diode to produce less current across it. A decrease in the current across the photo-diode will cause the voltage across the photo-diode to also decrease. This change in voltage is measured by using a potential divider between the photo-diode and a resistor. As the voltage across the photo-diode decreases the voltage across the resistor increases, meaning if the bacteria are growing in the well, a voltage increase across the resistor will be seen. This is shown in the graph below:</p> | + | <p align="center">To find out more about our Human Practices work, please visit:</p> |
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