Force Sensing Resistor Case Study

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2. Materials and Methods
The schematic representation of the prototype is depicted in Figure 3. A Force sensing resistor (FSR) is used for measuring the applied pressure. FSR, known for its smaller size and low power consumption can be easily embedded into the system. The controller, to which the FSR is interfaced with, is Arduino®, an open source platform available for electronics prototyping for creating interactive environments [18].
Figure 3. Block diagram of the prototype. The FSR is connected through the voltage divider circuit. The pressure display unit consists of Liquid Crystal Display (LCD) that is connected to the digital ports of Arduino®. The pressure ranges are classified using the data obtained from the calibration procedure and displayed on the LCD. An alarm circuit is connected in parallel with the LCD and the buzzer goes off when the pressure exceeds the required level. The number of compressions per minute is provided by Light Emitting Diode (LED) indications. Different counts …show more content…

With reference to this pressure, the pressure ranges are categorized and programmed using Arduino®. The prompts on the LCD are displayed according to the force sensed by the sensor. A visual feedback is given that provides the trainee, the necessary instructions during the procedure. Figure 9A shows the LCD outputs of different pressure levels and their corresponding ranges. A buzzer connected to pin 9 of Arduino® monitors the pressure level when the program starts running, and when the pressure level exceeds the required level, the buzzer goes off. Figure 9B depicts the alarm unit. The output from the serial monitor of Arduino® is shown in Figure 9C. The combined rate of compressions and ventilation can be in the ratio 3:1 and this would provide 90 compressions and 30 breaths per minute [7]. Figure 9D shows the visual indication to keep track of the number of compressions given per

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