2 layers45 × 35.5 mm
2 layers
CareLoop PCB
danieltaucher/CareLoop_PCB- Copper layers
- 2
- Thickness
- 0.89 mm
- Parts
- 67
- Nets
- 87
- Pads
- 309
- Tracks, vias
- 402, 14
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 30 Aug 2025
- Updated
- 3 Nov 2025
Overview
CareLoop PCB is an open-source printed circuit board by danieltaucher, from the danieltaucher/CareLoop_PCB repository on GitHub. It is a 2-layer board with 67 parts on 87 nets, routed with 402 tracks and 14 vias.
It is built around the MAX30102, MPU-6050 and PCA9306D, with the TP4056-42-ESOP8 among its other parts. Its parts include 29 capacitors, 11 resistors, 7 ICs, 6 inductors and 4 connectors. It belongs with the nRF52 and nRF5x boards of this library.
Main components
4
MAX30102
-Integrated ambient light cancellation (ALC)、Built-in temperature sensor、With proximity detection function - Heart Rate Sensors ROHSAnalog DevicesHeart Rate Sensors
MPU-6050
QFN-24-EP(4x4)-40℃~+85℃ 16bit 1KB 2.375V~3.46V 5uA Accelerometer Gyroscope I2C X,Y,Z X,Y,Z ±16g ±2000dps QFN-24-EP(4x4) Accelerometers ROHSTDK InvenSenseAccelerometers
PCA9306D
SO-8-40℃~+105℃ 1 1.8V~5.5V 1V~3.6V 2 2Mbps Automatic direction detection、Output enable high-impedance Bidirectional Level translator Open-drain SMBus、I2C SO-8 Translators, Level Shifters ROHSNXP SemiconductorsTranslators, Level Shifters
TP4056-42-ESOP8
ESOP-8-40℃~+85℃ 1 1A 2uA 4.2V 4V~8V Charging IC Lithium Battery Support ESOP-8 Battery Management ROHSTOPPOWERBattery Management
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100n | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C12, C20, C25, C27, C31, C32 |
| 6 | 1u | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C7, C11, C22, C40, C42, C43 |
| 4 | 12p | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C1, C2, C3, C4 |
| 4 | 4k7 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R2, R3, R22, R23 |
| 3 | 100p | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C9, C10, C26 |
| 3 | Jumper_2_Bridged | Connector_PinHeader_1.00mm:PinHeader_1x02_P1.00mm_Vertical | JP1_MAX30102, JP2_MPU1, JP2_MPU2 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R20 |
| 2 | 10u | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C24, C41 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R40, R41 |
| 2 | 4.7u | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C21, C23 |
| 2 | LED | LED_SMD:LED_0402_1005Metric_Pad0.77x0.64mm_HandSolder | D40, D41 |
| 2 | L_Small | Inductor_SMD:L_0402_1005Metric_Pad0.77x0.64mm_HandSolder | L50, L51 |
| 1 | 1.2p | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C6 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C30 |
| 1 | 10u | Inductor_SMD:L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | L5 |
| 1 | 15n | Inductor_SMD:L_0201_0603Metric_Pad0.64x0.40mm_HandSolder | L6 |
| 1 | 1p | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C5 |
| 1 | 2.2n | Inductor_SMD:L_0402_1005Metric_Pad0.77x0.64mm_HandSolder | L1 |
| 1 | 2.2n | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C33 |
| 1 | 200k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R21 |
| 1 | 20k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R42 |
| 1 | 300 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R4 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_MicroCrystal_CM9V-T1A-2Pin_1.6x1.0mm_HandSoldering | Y2 |
| 1 | 32MHz | Oscillator:Oscillator_SMD_Abracon_ASCO-4Pin_1.6x1.2mm | Y1 |
| 1 | 4.7n | Inductor_SMD:L_0402_1005Metric_Pad0.77x0.64mm_HandSolder | L2 |
| 1 | 47n | Capacitor_SMD:C_0201_0603Metric_Pad0.64x0.40mm_HandSolder | C8 |
| 1 | Antenna_Chip | RF_Antenna:Johanson_2450AT18x100 | AE1 |
| 1 | C_Small | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C50 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_1.00mm:PinHeader_1x02_P1.00mm_Vertical | J1_Battery1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_1.00mm:PinHeader_1x04_P1.00mm_Vertical | J1_DEBUG1 |
| 1 | Conn_Coaxial_Small | Connector_Coaxial:U.FL_Molex_MCRF_73412-0110_Vertical | J1 |
| 1 | LED_Small | LED_SMD:LED_0402_1005Metric_Pad0.77x0.64mm_HandSolder | D3 |
| 1 | MAX30102 | OptoDevice:Maxim_OLGA-14_3.3x5.6mm_P0.8mm | U2 |
| 1 | MCP1700x-180xxMB | Package_TO_SOT_SMD:SOT-89-3 | U1 |
| 1 | MCP1700x-330xxMB | Package_TO_SOT_SMD:SOT-89-3 | U4 |
| 1 | MPU-6050 | Sensor_Motion:InvenSense_QFN-24_4x4mm_P0.5mm | U3 |
| 1 | PCA9306 | Package_SON:X2SON-8_1.4x1mm_P0.35mm | U7 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_B3S-1000 | Reset_SW1 |
| 1 | TP4056-42-ESOP8 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U5 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10103594-0001LF_Horizontal | J2 |
| 1 | nRF52840-QFXX | Package_DFN_QFN:QFN-48-1EP_6x6mm_P0.4mm_EP4.6x4.6mm | U6 |
Questions
What parts does the CareLoop PCB use?
67 parts, built around the MAX30102, MPU-6050, PCA9306D and TP4056-42-ESOP8. 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.
Where can I download the CareLoop PCB KiCad files?
From the danieltaucher/CareLoop_PCB repository on GitHub, at the commit this page was made from: the board is CareLoop/CareLoop_PCB.kicad_pcb and its schematic CareLoop/CareLoop_PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CareLoop PCB design in my own project?
Its repository states no licence, so its author keeps all rights: ask danieltaucher before reusing the design.
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