16-08-2012, 12:22 PM
RF CONTROLLED STEPPER MOTOR
stepper motor.ppt (Size: 419 KB / Downloads: 49)
INTRODUCTION
Term RF used for Radio Frequency & STEPPER MOTOR is basically a DC appliance which rotates in all directions. As per project name RF controlled STEPPER MOTOR controlled through Radio Frequency by ASK(Amplitude shift keying) Modulation scheme.
AMPLITUDE SHIFT KEYING
Generally its is called as ON-OFF CODING TECHNIQUE
Amplitude-shift keying (ASK) is a form of modulation that represents digital data as variations in the amplitude of a carrier wave.
It comprises basically
1.Encoder – IC used is HT12E
2.Decoder - IC used is HT12D
DECODER
Circuit used is HT12D
212 Series of Decoders
A decoder is a device which does the reverse operation of an encoder, undoing the encoding so that the original information can be retrieved.
Operating voltage: 2.4V~12V
Low power and high noise immunity CMOS
technology
STEPPER MOTOR
A stepper motor is an electromechanical device, which converts electrical pulses into discrete mechanical movements. The shaft of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence. The motors rotation has several direct relationships to these applied input pulses. The sequence of the applied pulses is directly related to the direction of motor shafts rotation. The speed of the motor shafts rotation is directly related to the frequency of the input pulses.
Applications
In defense system spy car is very useful for getting the data & information without sending human. So many places where human do not reach robo reach easily & get the important information.
Industries are using RF solutions for monitoring, process, control, inventory tracking, our work sees through STEPPER MOTOR on the screen.
Commercial wireless applications such as security and access systems, gate control, remote activation.
Automotive companies employing RF for wireless remote control, remote keyless entry and safety applications.
Consumer products including electronic toys, home security, gate and garage door openers, intercom, fire and safety systems and irrigation controllers
Medical products like patient call and monitoring, handicap assistance device, surgery communication system, remote patient data logging and ECG monitor.