Gravity: MAX30102 PPG Heart Rate and Oximeter Sensor (I2C/UART)
MAX30102 PPG heart rate and SpO2 module with integrated MCU; I2C (0x57) or UART (9600 baud), 3.3/5 V supply, under 15 mA. Not a medical instrument; for hobby and prototyping use only. Finger pressure against the sensor directly affects reading accuracy.
Pinout
- DTGravity connector pin 1
I2C data line / UART TX
Type · SignalVoltage · 3.3V/5V logic - CTGravity connector pin 2
I2C clock line / UART RX
Type · SignalVoltage · 3.3V/5V logic - GNDGravity connector pin 3
Power negative / ground
Type · GroundVoltage · 0V - VCCGravity connector pin 4
Power positive input
Type · PowerVoltage · 3.3V/5V
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| DT | Gravity connector pin 1 | Signal | I2C data line / UART TX | 3.3V/5V logic |
| CT | Gravity connector pin 2 | Signal | I2C clock line / UART RX | 3.3V/5V logic |
| GND | Gravity connector pin 3 | Ground | Power negative / ground | 0V |
| VCC | Gravity connector pin 4 | Power | Power positive input | 3.3V/5V |
Pin details
4 connections- DTGravity connector pin 1
I2C data line / UART TX
SignalVoltage · 3.3V/5V logic - CTGravity connector pin 2
I2C clock line / UART RX
SignalVoltage · 3.3V/5V logic - GNDGravity connector pin 3
Power negative / ground
GroundVoltage · 0V - VCCGravity connector pin 4
Power positive input
PowerVoltage · 3.3V/5V
Start wiring
UART · I2C · Analog · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: GND, VCC, D/T, C/T. Schematik maps them to your board in the app.
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