The evaluation kit for heart rate, oxygen saturation (SpO2) and respiration rate uses Renesas’ highly integrated OB1203 biosensor for reflective photoplethysmography. With the provided algorithm, the kit can determine heart rate, SpO2 and respiration rate. The sensor transmits its data via an I2C interface to an MCU for data analysis and results display. The design incorporates an RL78/G13 16-bit microcontroller as the MCU, an ISL9111 voltage boost converter for battery operation and an OLED display.


  • Main Technical Parameters
    • Operating voltage: 3.0V (AAA battery * 2)
    • Detector module: OB1203 sensor module
    • Display module: OLED (Built-in control chip)
    • Measurement range: Oxygen saturation: 70%~100%
    • Pulse rate: 25bpm ~ 200bpm
    • Respiration rate
    • Operating temperature: -40 °C ~ 85 °C
    • Operating humidity: 5 ~ 99% RH (No condensate water)
  • Evaluation Kit Function
    • Collects data from Renesas' OB1203 sensor module through I2C communication.
    • Calculates the oxygen saturation, pulse rate and respiration rate with algorithm.
    • Displays oxygen saturation, pulse rate, respiration rate, and battery level on an OLED.
    • An ISL9111 boosts battery voltage to system level.



Title language Type Format File Size Date
User Guides & Manuals
star OB1203SD-RL-EVK Evaluation Kit Manual Manual - Development Tools PDF 968 KB
OB1203 Certification Preparation Setup and Test Procedure Manual - Development Tools PDF 1.27 MB
OB1203SD-RL-EVK Schematics Schematic PDF 200 KB
Recalculation of R Curve Other XLSX 76 KB
Whaleteck Test Adapter Rev5 Other STL 231 KB
Whaleteck Test Adapter Rev5 Applicator Other STL 93 KB


Title language Type Format File Size Date
OB1203SD-RL-EVK C Code Evaluation Kit Source Code Software & Tools - Evaluation Software ZIP 1.56 MB
OB1203SD-RL-EVK BOM PCB Design Files XLSX 13 KB
OB1203SD-RL-EVK Gerber Files PCB Design Files ZIP 342 KB

select_allSoftware & Tool Pages

Title Type Description Company
e² studio IDE and Coding Tool Eclipse-based Renesas integrated development environment (IDE).
[Support MCU/MPU: RA, RE, RX, RL78, RH850, Renesas Synergy, RZ]
(Note: You need to install compiler separately as an additional software)
(Note: No separate e² studio installation required for RA FSP, this will be installed as part of the FSP with e² studio installer (Platform Installer) on GitHub.)