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Motion Sensor Module is implemented using Low Voltage TTL (LVTTL) which means the electrical signals on its pins vary between 0V to 3.3V to carry bits over electrical interface while GPIO Module(pin) is based on TTL implementation. TTL voltages vary between 0V to 5V to carry data bits. To connect LVTTL pins(sensor) to TTL pins(GPIO), we will have to use extra circuitry for interfacing which ensures the data sent or received is consistent on both side.
[http://www.maxim-ic.com/datasheet/index.mvp/id/1798 Example of LVTTL to TTL convertor]
'''System'''