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Design and Manufacture of Low-Cost Real-Time Feedback CPR ManikinCardiopulmonary Resuscitation (CPR) is a life-saving technique used when a person stops breathing or a heart stops beating. Immediate CPR can double or triple survival rates after cardiac arrest. While many CPR training courses use non-electronic CPR manikins, recent literature has shown that training on a real-time feedback CPR manikin improves functional outcomes such as chest compression rate and mean tidal volume. However, current commercially available real-time feedback manikins either only measure metrics on chest compressions or are available at very high prices, making training a class on such manikins infeasible. Accordingly, we have designed, constructed, and tested a low-cost Arduino microcontroller-based CPR manikin that provides real-time feedback to trainees on critical metrics including force of compressions, rate of compressions, hands-off time, percentage of full chest recoils, angle of neck tilt, and other steps in ventilations. Visual and auditory feedback on these metrics is delivered to trainees, allowing them to adjust their performance in real time. Additionally, data from each training session is saved and assigned to a user profile, so that multiple trainees can review their progress throughout their training. Future research will be conducted on the efficacy of training on this manikin compared to commercially available manikins.