Orlando Hoilett has built his new biomedical Arduino 101 shield: Biomed Shield, in order to allow students, educators, and hobbyists to learn about bio-medicine by monitoring heart rate, temperature, and other physiological metrics.
To build this shield he used the following components:
Microchip Rail-to-Rail Input/Output Dual Op-Amp
MAX30101: a specialized integrated circuit that is able to perform reflectance photoplethysmography
Orlando measured heart beats using transmission photoplethysmography using MAZ30101, where a light shines through an extremity such as a finger and a detector measures the amount of light that passes through. When the heart pumps blood through the body, a momentary increase in blood volume in the fingers happens. As a result, the amount of light that passes through the finger changes with this changing blood volume and is detected by the photodetector.
Bioimpedance is can be another class of bioelectrical measurements where we measure the impedance of the body instead of measuring the electrical signals produced by the body with the help of AD5934 impedance analyser chip. He is also measuring body temperature with the MLX90614 and measuring the amount of light using a CdS Photocell.
Orlando built this shield for education purposes not as a medical device, and his work on this shield is still in progress. Follow his project on hackster.io to know more details and updates. You can check source files at Github.
Konstantin Dimitrov shows us how to build a contactless OLED thermometer using Arduino and MLX90614 infrared sensor.
Hello, everyone ! Today I’m going to show you how to make a contactless OLED thermometer with Arduino UNO and Infrared temp sensor MLX90614 in 5 minutes. This project is very simple, it requires basic programming and electronic skills to make it.
Contactless OLED Thermometer With Arduino and MLX90614 – [Link]
In this video we learn how to build a very usefull project. An Infrared thermometer, using the MLX90614 IR temperature sensor and the a Nokia 5110 LCD display shield. We are also using an Arduino Uno but you can use any Arduino board you like.
Arduino IR thermometer using the MLX90614 IR temperature sensor – [Link]
mcs.uwsuper.edu has build a contactless thermometer based on MLX90614 sensor and MSP430 mcu.
The device is designed for contactless measuring and monitoring temperature of objects. It is built on Melexis MLX90614 sensor and can measure temperatures in the range from -70°C to +380°C with 0.5°C accuracy and 0.01°C resolution. The period of measurements can be set in the menu from 1 sec to 1 min in 10 sec increments. It is also possible to record the temp measurements and upload them to a computer via the serial interface through X1 and an external level converter.
Contactless Infrared Thermometer (Pyrometer) using MLX90614 and MSP430 – [Link]
One of the most commonly used medical instruments nowadays is the thermometer. The thermometer is used to monitor or measure the body temperature of a sick person. The idea of creating a thermometer started from a device called thermoscope, a thermometer without a scale. Several inventors developed it until Sir Thomas Allbutt invented the first practical 6-inch medical thermometer able to sense a body temperature in five minutes. The development of the thermometer did not stop there and today, digital thermometer exists which is faster and very accurate.
This reference design is an example of a low cost non-contact digital thermometer. It only uses a microcontroller, a four digit seven segment display and an infrared (IR) temperature sensor. The concept of this design is to make the IR sensor measure the temperature of the thermal radiation emitted by the body being measured. The data acquired by the sensor will be sent to the microcontroller through the I2C bus. The microcontroller will analyze the data and then shows the body temperature on the four-digit seven-segment display.
The circuit of this reference design uses few components only and is very easy to understand. However, to make the circuit function accurately, software calibration must be implemented carefully. The whole circuit is powered by a 5V DC power supply regulated from the four 20mm coin shape batteries contained in a 120591-1 TE Connectivity battery holder. The batteries are connected in series-parallel connection to produce a 6V 480mAh source of power. With the help of a low-dropout voltage regulator, the 6V is regulated to a 5V DC supply