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| Reference | Controller Used | Health Parameters | Portability | Error (%) |
|---|---|---|---|---|
| [10] | ESP32 | Heart Rate, Body temperature, Room Humidity, | Yes | Less than 5% |
| [3] | PIC micro-controller | Electrocardiogram, Body temperature | No | Not provided |
| [7] | Arduino Uno, Node MCU | Body temperature, pulse rate and SPO2 | No | Not provided |
| [21] | Arduino Uno, Bluetooth, WiFi modules | Blood Presure, Heart rate | No | Not Provided |
| Proposed Solution | ESP32 | Body temperature, Pulse rate, SpO2 | Yes | Less than 3% |
