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We are using zilog motion detection module as motion sensor. The good thing about this module is that it includes a built in micro controller with application software running on it.
This Micro Controller Unit (MCU) along with its application software is not only meant for providing standard interfaces to existing computer system but also gives more control to programmers to control this module from their own program/logic.
'''Interfacing Sensor with Panda Board'''
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.
'''System'''
On detecting a motion, motion sensor would send the signal to panda board GPIO pin which we could read as a file in Linux. Based on the file content which is signal received from motion sensor, we can use system call to turn on the display from standby mode to display mode. We can automate all of these activities in a script which will always be running in back ground.
