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Small finger-clip sensor with green LED and Grove cable

Seeed Studio

Seeed Studio Grove Finger-clip Heart Rate Sensor

SKU CH-9EDK-CE3RF

A finger-clip optical sensor measures heart rate from 30 to 210 bpm using a 525 nm green LED and STM32F103 processing, with Grove plug-and-play connectivity

  • TypeSensors
  • Ultra-low power PAH8001EI-2G sensor extends battery life in wearables
  • 525 nm green LED with integrated DSP delivers accurate heart-rate readings
  • STM32F103 processor handles up to 3000 fps for fast algorithm execution
  • Grove unified socket enables plug-and-play connection to development boards
  • Measures 30–210 bpm across -20 °C to +60 °C operating range

Heart-Rate Sensor for Wearables

The Seeed Studio Grove Finger-clip Heart Rate Sensor measures pulse through a 3.0 x 4.7 mm optical window using a 525 nm green LED and the PAH8001EI-2G chip. An onboard STM32F103 handles the detection algorithm and exposes an SWD port for reprogramming. The module connects through a Grove unified socket for plug-and-play integration. It targets developers building healthcare or sports wearables such as watches and wrist-bands.

Upgrade from Basic Optical Modules

This sensor replaces simpler photoplethysmogram components that lack integrated processing or power management. The jump is worth it when a project needs on-board heart-rate calculation up to 3000 fps and a sleep mode that extends battery life in wearable form factors. Designs that only require raw waveform data without real-time BPM output may not need the extra processing headroom.

Capacity and Headroom

The device reports heart rates from 30 to 210 BPM across a -20 to +60 °C operating range at 6.8 MHz clock speed. The finger-clip housing measures 65 x 100 x 12 mm and ships with a Grove cable but no battery. Applications demanding continuous monitoring in compact wearables fit the power profile; scenarios needing multi-site measurement or clinical-grade diagnostics exceed the single-channel optical design.

Highlights

  • Ultra-low power PAH8001EI-2G sensor extends battery life in wearables
  • 525 nm green LED with integrated DSP delivers accurate heart-rate readings
  • STM32F103 processor handles up to 3000 fps for fast algorithm execution
  • Grove unified socket enables plug-and-play connection to development boards
  • Measures 30–210 bpm across -20 °C to +60 °C operating range

Specifications

TypeSensors

Questions about this item

What are the physical dimensions of the sensor module?

The module measures 65mm x 100mm x 12mm and has a sensor area of 3.0 x 4.7 mm.

How do I connect the sensor to a microcontroller and what is a common mistake?

Plug the supplied Grove cable into the Grove unified socket on the sensor and the matching port on your board; a common mistake is reversing the cable, which prevents the sensor from powering up.

What ongoing maintenance does the sensor require?

No battery is included and the sensor has no user-replaceable parts; keep the optical window clean and ensure the operating temperature stays within -20 to +60 °C for reliable readings.

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