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Wireless remote controlled toy cars work on the concept explained in this project.Motor control through RF communication is a very interesting application and iswidely used inrobotics, electronics toys, automation systems etc. This topic coversthe way DC motors can be driven by using the controls from a distant place. Thecontrols are transferred from one end to another by employing anRF module.

The remote controlapplication of RF has been extended to operate a motor driver

which in turn controls the direction of motors.

Description

The circuit of this project uses RF module to control DC motors through a motor

driver ICL293D. Transmission is enabled by giving a low bit to pin14 (TE, active low)of encoderHT12E. The controls for motor are first sent to HT12E. Pins 10 and 11

http://www.engineersgarage.com/articles/robotics-tutorial-introduction-robotshttp://www.engineersgarage.com/articles/robotics-tutorial-introduction-robotshttp://www.engineersgarage.com/articles/robotics-tutorial-introduction-robotshttp://www.engineersgarage.com/content/rf-modulehttp://www.engineersgarage.com/content/rf-modulehttp://www.engineersgarage.com/content/rf-modulehttp://www.engineersgarage.com/electronic-circuits/rf-module-based-wireless-remotehttp://www.engineersgarage.com/electronic-circuits/rf-module-based-wireless-remotehttp://www.engineersgarage.com/electronic-circuits/rf-module-based-wireless-remotehttp://www.engineersgarage.com/electronic-circuits/rf-module-based-wireless-remotehttp://www.engineersgarage.com/content/ic-l293dhttp://www.engineersgarage.com/content/ic-l293dhttp://www.engineersgarage.com/content/ic-l293dhttp://www.engineersgarage.com/content/ht12ehttp://www.engineersgarage.com/content/ht12ehttp://www.engineersgarage.com/content/ht12ehttp://www.engineersgarage.com/content/ic-l293dhttp://www.engineersgarage.com/electronic-circuits/rf-module-based-wireless-remotehttp://www.engineersgarage.com/electronic-circuits/rf-module-based-wireless-remotehttp://www.engineersgarage.com/content/rf-modulehttp://www.engineersgarage.com/articles/robotics-tutorial-introduction-robots

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(D0-D1) are used to control one motor while pins 12 and 13 (D2-D3) to controlanother motor. The data signals of encoder HT12E work on negative logic. Thereforea particular signal is sent by giving a low bit to the corresponding data pin ofencoder.

The parallel signals generated at transmission end are first encoded (into serial

format) by HT12E and then transferred through RF transmitter (434 MHz) at a baud

rate of around 1-10 kbps. The same signals are acquired by RF receiver after which

it is decoded byHT12D. For more details, referRF remote control.

Since the encoder/decoder pair used here works on negative logic, the decoded

signals are fed to an inverter (NOT gate) IC 74LS04. The proper (inverted) signals

are then supplied to L293D. L293D contains two inbuilt H-bridge driver circuits to

drive two DC motors simultaneously, both in forward and reverse direction.

The motor operations of two motors can be controlled by input logic at pins 2 & 7 and

pins 10 & 15. Input logic 00 or 11 will stop the corresponding motor. Logic 01 and 10

will rotate it in clockwise and anticlockwise directions, respectively. Thus, depending

upon the signals generated at the transmission end, the two motors can be rotated in

desired directions.

Circuit Diagram

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Components

60,450-Reads

L293D

L293D is a dual H-bridgemotor driver integrated circuit (IC).

Motor drivers act as current amplifiers since they take a low-

current control signal and provide a higher-current signal. This

higher current signal is used to drive the motors.

...

42,247-Reads

IC 74LS047404 is a NOT gate IC. It consists of six inverters which

perform logical invert action. The output of an inverter is the

complement of its input logic state, i.e., when input is high its...

28,814-Reads

HT12D Decoder IC

HT12D is a decoder integrated circuit that belongs to212 series of decoders. This series of decoders are mainlyused for remote control system applications, like burglaralarm, car door controller, secur...

36,633-Reads

HT12E Encoder ICHT12E is an encoder integrated circuit of 212 series of

encoders. They are paired with 212 series of decoders for

use in remote control sy...

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