Hardware Development
Week 7 - Wednesday
August 29, 2018
Discussion:
MAX30100 pulse sensor is a pulse sensor module that suitable for Arduino Uno R3 for this project. This module will act as the PPG sensor to measure the blood glucose level by monitoring the heart rate from the sensor module. This sensor is an integrated pulse oximetry and heart rate monitor sensor solution. It combines two LEDs, a photodetector, optomized optics and a low-noise analog signal processing to detect pulse oximetry and heart rate signals. However, the output signals from the sensor is too small.
Hence, the solution for this problem is the sensor is connected to the IR detection circuit with pull-up resistors with value 4.7k ohms.
Conclusion:
The hardware development is involved with the active-low interrupt pin pull lows when interrupt is triggered. The pin is open-drain and required a pull-up resistor or current source to an external voltage supply up to +5V from GND. The interrupted pin is not designed to sink the larg currents, hence, the pull-up resistors are needed.
August 29, 2018
MAX30100 Pulse Oximetry Sensor
Objective: To explain the used of MAX30100 pulse sensor in the hardware development.Discussion:
Figure 3 MAX30100 pulse oximetry sensor
Hence, the solution for this problem is the sensor is connected to the IR detection circuit with pull-up resistors with value 4.7k ohms.
Conclusion:
The hardware development is involved with the active-low interrupt pin pull lows when interrupt is triggered. The pin is open-drain and required a pull-up resistor or current source to an external voltage supply up to +5V from GND. The interrupted pin is not designed to sink the larg currents, hence, the pull-up resistors are needed.