RF communication is widely used in different application like robotic and other automation system. in this tutorial we will learn to drive dc motor from remote place by using rf module
TRANSMITTER
The transmitter module is working on the frequency of 433Mhz. we have 4 switches s1,s2,s3,s4 connected to encoder.4 bit parallel that is given to encoder through switches(active low).A resistance as high as 1Mohm is required in between OSC1 and OSC2 pins.encoder converts parallel data into serial data before it to be fed to transmitter by DOUT pin.
RECEIVER
in receiver side a led is connected to pin no 17 ,whenever receiver receives any data led got blink. the serial data receives by receiver is fed to pin no 14(DIN) which is further converted again to 4 bit parallel. this parallel line are connected to L293D driver for operating motion DC motor.A 51 kohm resistor is connected in between OSC1 and OSC2
NOTE>>default address for both transmitter and receiver are same i.e 10000000.ensure that both must have same address configuration.assume in event where two participant are using same rf module there is certain chances of interference.obviously you don't want your car to be controlled by someone else:-).This is where address pins come into play ,8 address pins provide you opportunity to have different addresses
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