A non-intrusive MCU-based Visual g1b meter circuit design

G1b meter is used for monitoring patients blood oxygen content of medical equipment.

The amount of oxygen measuring device and the heart rate and the reduced to a predetermined thresholds generate alarms. This type of monitoring for newborn babies and surgical procedure is extremely useful.

Non-intrusive Visual pulse oximetry meter design used by MSP430FG437 microcontroller (MCU) peripherals probe and MCU organic, and uses the LCD glass panel displays the status and pulse frequency of oxygen.

The application of the sensor at the same time for heart rate measurement and measurement of pulse oximetry. The probe is placed in the human appearance of a certain point, such as finger, earlobe or nasal front-end. The probe contains two light-emitting diode (LED), one of which is red visible spectrum (660nm), another is in the infrared spectrum (940nm). By measuring each frequency of light through the strength of the human body, and then calculate the two strength ratio between, you can determine the body's oxygen percentage.

The above icon example of a low-power MSP430 MCU's single-chip, portable implementation of pulse oxygen meter.

Due to the high level of integration enables external component quantity remains minimal. And, by keeping the flux-State time (ONtime) minimized and two light sources of the periodical supply, making power to reduce.