kian09/GuardianA compact health monitoring device that is worn on the wrist. Its capabilities are measuring your heart rate and detecting accidental falls using an accelerometer.
First design is an open-source printed circuit board by kian09, from the kian09/Guardian repository on GitHub. It is a 2-layer board of 55 × 40.1 mm with 55 parts on 81 nets, routed with 268 tracks and 48 vias.
It is built around the ESP32-S3-WROOM-1-N16R8, MAX30102EFD+ and BQ24075RGT, with the MPU-6050, TLV75733PDBV and RC0603FR-0710KL among its other parts. Its parts include 18 capacitors, 14 resistors, 6 ICs, 3 connectors and 1 diode. It belongs with the ESP32 boards of this library.
Guardian
A wrist worn compact health monitoring device. Its capabilities are measuring your heart rate and detecting accidental falls using an IMU.
The ESP32S3 can be programmed through a UART interface, using the header pins. The board can be powered with a 3.7v LiPo battery, or through the barrel jack with a 5v supply. Once on, the board uses the IMU to continuously check for any accidental falls, and send alerts over Bluetooth if necessary. In order to check your heart rate, you need to place your finger over the heart rate sensor and wait about 5 seconds for the ESP32S3 to read your heart rate, send the data, and detect any abnormal behaviour. To charge the battery, just leave it plugged in and supply 5v through the barrel jack.
My inspiration for this project came from my grandfather. There have been several health incidents with my grandfather involving his heart and him falling as a result of these heart problems. Naturally, I was really concerned, so I decided to design a health monitor that could be used to monitor my grandfather's heart rate wirelessly and detect any dangerous falls.
I already tested a basic code on the prototype for reading from the IMU and heart rate sensor, but the firmware will essentially let the ESP32S3 read data from the MPU-6050 and MAX30102 over I2C, then processes motion data to detect falls and read heart rate data from the sensor. Alerts are sent over Bluetooth when abnormal activity is detected.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10µF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C3, C5, C7, C11, C12, C14, C19 |
| 7 | 0.1µF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C6, C8, C9, C10, C13, C15 |
| 5 | 4.7K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R13, R14, R15, R16 |
| 4 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R6, R8, R9 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_1.5x1.5mm | I2C0, I2C1, SDA0, SDA1 |
| 4 | TestPoint | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | 1V8, 3V3, BAT1, GND1 |
| 3 | 120Ω | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R7, R10 |
| 3 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | CHG1, PGOOD1, PWR1 |
| 2 | 4.7µF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C17 |
| 1 | 1.13K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 1.1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 2200pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C16 |
| 1 | B140-13-F | Diode_SMD:D_SMA_Handsoldering | D2 |
| 1 | BQ24075RGT | Package_DFN_QFN:VQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm | U2 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_CUI_PJ-102AH_Horizontal | J3 |
| 1 | Battery Connector JST | Connector_JST:JST_EH_S2B-EH_1x02_P2.50mm_Horizontal | J2 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | ESP32-S3-WROOM-1-N16R8 | RF_Module:ESP32-S3-WROOM-1 | U6 |
| 1 | LOGO | hackclub:hackclublogo | G*** |
| 1 | LOGO | hackclub:logo2 | G*** |
| 1 | MAX30102EFD+ | OptoDevice:Maxim_OLGA-14_3.3x5.6mm_P0.8mm | U9 |
| 1 | MPU-6050 | Sensor_Motion:InvenSense_QFN-24_4x4mm_P0.5mm | U8 |
| 1 | TLV75733PDBV | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | TPS7A0518PDBVT | Package_TO_SOT_SMD:SOT-23-5 | U3 |
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It measures 55 × 40.1 mm and has 2 copper layers, 1.6 mm thick.
55 parts, built around the ESP32-S3-WROOM-1-N16R8, MAX30102EFD+, BQ24075RGT and MPU-6050. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the kian09/Guardian repository on GitHub, at the commit this page was made from: the board is hardware/first_design.kicad_pcb and its schematic hardware/MAX30102.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask kian09 before reusing the design.