ATtiny85 - AVR 8 Pin Waterproof The sensor clips onto a

The sensor clips onto a fingertip or earlobe and plugs right into Arduino with some jumper cables

Infrared Receiver diode

however you can load different firmwares to make your own applicaiton on the modules' memory and processor

then the displacement of the object can be defined

Input voltage: 4

ATtiny85 - AVR 8 Pin Waterproof The sensor clips onto aIntroduction : ATtiny85 8 Bit Processor. 8K of program space, 6 I O lines, and 4 channel 10 bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. Features : Controller Family : AVR Tiny. Core Size : 8bit. No. of I O's : 6. Program Memory Size : 8KB. EEPROM Memory Size : 512Byte. RAM Memory Size : 512Byte. CPU Speed : 8 16 MHz internal clock, up to 20MHz external clock. No. of Timers : 2. Peripherals: ADC, Comparator.