BME4503C Midterm Project - Sensor Circuit Objective Design and analyze a sensor-based circuit that integrates at least one sensor and one additional active and/or output component (amplifier, filter, actuator, or logic function). Your system should measure or respond to a parameter that can be related to a biomedical device. For example, temperature, light intensity, force, or proximity measurements that can be used in some sort of medical sensor. Demonstrate signal conditioning, data acquisition, and/or responses. Design Requirements Your circuit must include: At least one sensor (input device). At least one active and/or output component, such as: LM358 op-amp used for amplification, comparison, or filtering. LED(s) or buzzer for feedback. Arduino-based logic or data visualization. Biomedical relevance: relate your measurement or feedback to a real-world medical or physiological context. Data analysis in MATLAB (plotting, threshold detection, or calibration). Project Examples/Ideas you can use and build upon: PPG (Photoplethysmography) Sensor - use a photoresistor and LED to measure changes in light reflectance (or transmission) from a fingertip. Temperature-controlled feedback - Use temperature sensor and LED/buzzer/digital output to alert to high and low "body" temperatures. Proximity sensor - Use a comparator circuit (op-amp) to switch on/off LED or buzzer in response to photoresistor changes. Tactile sensor - Use a strain gauge to control an LED or buzzer. Rubric - Use lab report template Introduction (10 pts) Purpose of your circuit and biomedical motivation. Description of what parameter is being measured or controlled. Circuit Design (20 pts) Schematic/photo of circuit Identify all components and describe their function. Specify sensor type and op-amp configuration (amplifier, comparator, filter, etc.). Theory (15 pts) Explain sensor usage. Provide and discuss any equations used. Experimental Data (30 pts) Provide voltage readings, plots, or screenshots demonstrating operation. Describe how your circuit responds to changes in input. Discussion (20 pts) Discuss biomedical application, accuracy, and error sources. Suggest one improvement or extension. Presentation & Clarity (5 pts) Logical organization, labeled figures (plots especially), proper units, and grammar. Submission Checklist Upload the following: PDF report Matlab data (.mat) MATLAB script (.m only) Circuit image (photo) Video of circuit operating