Assignment 5: Input Devices

Different sensors in our smart phone and their uses:

Accelerometer:

• Accelerometers handle axis-based motion sensing and can be found in fitness trackers as well as phones.They’re the reason why your smartphone can track your steps even if we haven’t bought a separate wearable.
• They also tell the phone’s software which way the handset is pointing, something that’s becoming increasingly important with the arrival of augmented reality apps.



Gyroscope:

• The gyroscope helps the accelerometer out with understanding which way our phone is orientated— it adds another level of precision so those 360-degree photo spheres really look as impressive as possible.
• Whenever you play a racing game on your phone and tilt the screen to steer, the gyroscope rather than the accelerometer is sensing what you’re doing, because we are only applying small turns to the phone and not actually moving through space.



GPS:

• GPS units inside phones gets a ping from a satellite up in space to figure out which part of the planet you’re standing on (or driving through). They don’t actually use any of your phone’s data, which is why you can still see your location when your phone has lost signal, even if the map tiles themselves are a blurry, low-res mess.


• Measurement and analysis of the data for a sensor in a log: The data has been logged using log SensoDuino for gyroscope.


HC-SR04P Ultrasonic Ranging Distance/Proximity Sensor:

Proximity sensor/Ultrasonic sensor module detect the presence of nearby objects without any physical contact.

Process

• 1. Making connection :

• 2. Checking port connection of the arduino
• 3. Compiling and uploading arduino codes
• 4. Goto serial monitor in tool section to get the distance.

Arduino Code

Download


Real world application

In mobile devices, the proximity sensor is used to detect whether the user's face is close to the phone during a phone call, prompting the screen to turn off to prevent false touches on the touchscreen.




Infer from data sheet

The data sheet for Ultrasonic Ranging Module HC - SR04(Download) speaks about the range of ultrasonic sensor, the basic principle of working, voltage and current required and wire connections. Basically this sensor provides range between 2cm to 400cm. This proximity sensor works on 5v voltage and 15mA current.