He’s built a finger-mounted pulse detector using a few simple components and an Arduino. This circuit uses a method known as photoplethysmography.

If you’d rather ditch the PC altogether, you might want to check out this standalone heartbeat sensor instead. Posted in Arduino Hacks Tagged arduino, heartbeat, infrared, led, medical ...

for more information on building your very own heartbeat visualiser using an Arduino Nano microcontroller and heart rate sensor jump over to the official Instructables project page.

In this article, I have added three sensors with Arduino UNO and user can choose the required sensor with the help of keypad.

This is an Arduino-based Proximity Sensor circuit wired using the popular HC-SR04 Ultrasonic ranging module,used here for non-contact object detection purpose. The HC-SR04 module includes ultrasonic ...

With over 20 unique sensor types, and the ability to be used with several different development platforms, Tarts wireless sensors allow for endless sensing, monitoring and control possibilities.