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It is a Heart Rate Sensor.
Seeeduino Lotus is an ATmega328 Microcontroller development board. It is a combination of Seeeduino and Base Shield.
In the pursuit for small form factor, flexibility and functionality comes Seeeduino Mega – derived from Arduino Mega it harnesses the power of ATmega2560 to spice up your project building experience.
Seeeduino is Arduino compatible board. Based on Duemilanove Schematic, 100% compatible to its existing program, shield and IDEs. On the hardware part, remarkable changes are taken to improve the flexibility and user experience.