Gesture Controlled Robot Using Raspberry Pi

Gesture Controlled Robot Using Raspberry Pi Have you ever tired of controlling everything with buttons? Thought of controlling something with simple hand movements by sitting on your lazy couch? If yes, then you are at the right site. In this tutorial we are going to control a robot driven by two DC motors by simply using hand movements. There are different kind of sensors to detect your hand movement like flux sensors, Accelerometers and other gravity based sensors. So for wireless transmission we are going to use RF 434 module which transmit 4 bit data. 4 bit data means you can transmit 16 different combinations i.e., 0000 to 1111. Further in this tutorial we will use an encoder and decoder to avoid interference in the air interface. A motor driver will drive the motors from using the decoder data.   We use our Raspberry pi at the transmitter end to analyze the sensor data and to transmit a data combination to the motor driver to drive the motors accordingly so that the robot can hover around. We will be using a 12 V battery on robot to power the decoder module, receiver module and the motors. At the transmitter end sensors and transmitter encoder module is powered by raspberry pi itself. Components Gesture Controlled Robot Using Raspberry Pi – Block Diagram Transmitter End   In transmitter side we have Accelerometer, raspberry pi , encoder module and RF transmitter. The gesture data flows from accelerometer to the raspberry pi and there it is processed to decide the movement of the robot and the data for motion is transferred to the encoder module via GPIO pins. The encoder module encodes the data and transmit into air interface with the help of RF transmitter. Gesture Controlled Robot Using Raspberry Pi – Receiver End     The RF receiver from the receiver end gets the data from the air interface and gives it to the decoder module. The decoder module decodes the received data and provides it to the motor driver L293D. From the motor driver the motors are driven according to the gesture data. Accelerometer Aceleration is the measurement of the change in velocity, or speed divided by time. For example if a car moves from rest 0 to 60 Km/hr in 10 seconds, the car is accelerating at 6Km/hr. So what it has to do with my hand gesture? An accelerometer is an electromechanical device used to measure acceleration forces. Such forces may be static, like the continuous force of gravity or, as is the case with many mobile devices, dynamic to sense movement or vibrations. By measuring the amount of static acceleration due to gravity, you can find out the angle the device is tilted at with respect to the earth. By sensing the amount of dynamic acceleration, you can analyze the way the device is moving. Some accelerometers use the piezoelectric effect -they contain microscopic crystal structures that get stressed by accelerative forces, which causes a voltage to be generated. Another way to do it is by sensing changes in capacitance. If you have two microstructures next to each other, they have a certain capacitance between them. If an accelerative force moves one of the structures, then the capacitance will change. Add some circuitry to convert from capacitance to voltage, and you will get an accelerometer. Accelerometers are low power devices which output acceleration in the form of Analog voltage and some accelerometers in digital form. Analog accelerometers like ADXL 335 gives you 3 analog output  X,Y,Z  base on the axis of your movement. You can convert these analog voltages...
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