Difference between revisions of "Sensor-Pulse"

Sensor-Pulse

The product number of Sensor-Pulse is: MSDI31

Sensor-Pulse is a heart rate or pulse sensor of photoelectrical principle.

Sensor-Pulse takes advantage of the sensitivity of the infrared with specified wavelength to the change of the blood volume produced by the blood microcirculation in the end of the blood vessel to detect the change of fingertip blood caused by heart beat.

The sensor can output the completed pulse wave voltage signal reflecting the change of the fingertip blood volume.

Introduction of Pins

Pins of the sensor: PIN1: GND PIN2: VCC General signal pins: PIN3(IO1): digital/analog signal PIN4(IO2): NC(null) Special signal pins: If it is IIC: IO1/IO2 are respectively SDA/SCL. If it is soft serial port: IO1/IO2 are respectively tx/rx.

Special to Sensor-Pulse sensor pins PIN1: GND PIN2: VCC PIN3(IO1): Analog read PIN4(IO2): NC Microduino sensor can communicate with core module through the connection with Microduino-Module Sensor Hub.

Features

• Low power consumption
• High flexibility
• Small and easy to install.

Specification

• Electrical specification
  • Operation voltage: 1.8V-5.5V
  • Input device
• Tech parameters
  • Operation temperature: -40°C-85°C
  • Lead free packaging, complying with ROHS standard.
  • Supply current: IQ = 100µA (typical)
  • 90°phase margin(typical)
  • Adopt MCP6001 1MHZ low-consumption amplifier
  • 1MHz gain bandwidth product (typical)
  • Adopt APDS-9008 analog input environment brightness sensor
• Size
  • 1.27mm-pitch 4Pin interface
  • Size of the Switch: 5mm*5mm
  • Size of the Board: 20mm*20mm

• Connection method
  • Pin description: GND, VCC, signal output and NC(Empty).

Note: This output signal is analog signal, which needs analog interface to detect(A0~A7). You can connect it to the pins--1,2,10,11 and 12 of the Sensorhub with correpsoinding pins-- IIC（A4）, IIC（A5）, A6, A2 and A0

Document

• Chip: File:APDS-9008.pdf File:MCP6001.pdf
• Schematic: File:Microduino Pulse.Zip

Development

Preparation

• Make sure you build Microduino development environment. If not, please refer to: Microduino Getting started
• Core module selection
  • 1.Adopt Microduino-CoreUSB or mCookie-CoreUSB.
  • 2.Adopt Microduino-Core or Microduino-Core+ together with Microduino-USBTTL for program download.

Program

• Test Program:

Microduino_Pulse_measurement

Hardware Buildup

• All hardware needed(Except core module): Microduino-Cube-S1, Microduino-OLED, Microduino-Sensorhub and a USB cable as well as some connectors.
• Stack all modules together, insert the pulse sensor into the A0 slot of Microduino-Sensorhub with the connector and connect Microduino-OLED with Microduino-Cube-S1 board's IIC interface via an OLED wire.
• Open test program, choose the right board, compile and download.
• After download, you can see OLED's interaction interface. The first line shows pulse rate and the second lines displays time and calculate the total heartbeats.
  • The pulse sensor starts counting when you press your finger tip onto it and it will calculate heartbeats after around 10 seconds.
  • Move your finger away and the system will clear automatically .

Application

Microduino-Pulse sensor can be applied in smart hand belt, detecting heartbeats during physical exercise so that you can adjust yourself.

Project

Purchase

History

Pictures

• Front

Microduino-Cube-Station Front

• Back

Microduino-Cube-Station Back