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This feature is available in the latest high end smart phones present in the market
The LM393 Speed Sensor Module is basically an Infrared Light Sensor integrated with LM393 Voltage Comparator IC
Stall Current: 120mA max
it first intercepts one half of the PIR sensor
Arduino Nano Metal Caster Wheel This feature is available inIntroduction : The Arduino Nano is a small, complete, and breadboard friendly board based on the ATmega328 (Arduino Nano 3. x). It lacks only a DC power jack, and works with a Mini B USB cable instead of astandard one. Features : Operating voltage : 5V. Recommended input voltage: 7v to 12V. Digital input output pins : 14 (Out of which 6 provide PWM output) Analog input output pins : 6 pin. Flash Memory : 32 KB. DC Current on I O Pins : 40 mA. DC