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Remote Control car : a piece of cake

This a beginner level robotic project. And its so simple to make that there is no programming skill or programming needed to make this robot

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Hello everyone, in this post I will show you step by step instruction on how to make simple rf(radio frequency) RC(remote control) car.This is a very simple and beginner level robotic project which can be made by anyone. I will be discussing on the working of all integrated circuit (IC) and modules used in this robot.And there is no programming required for making this robot

Watch the robot in action


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What is RF module ?

This RF module consist of an RF Transmitter and an RF Receiver. The transmitter/receiver (Tx/Rx) pair operates at a frequency of 434 MHz. An RF transmitter receives serial data and transmits it wireless through RF through its antenna connected at pin 4. The transmission occurs at the rate of 1Kbps – 10Kbps.The transmitted data is received by an RF receiver operating at the same frequency as that of the transmitter. The RF module is used along with a pair of encoder and decoder. The encoder is used for encoding parallel data for transmission feed while reception is decoded by a decoder. HT12E-HT12D

Working of the Robot


The RF module is used along with a pair of encoder and decoder. The encoder is used for encoding parallel data for transmission feed while reception is decoded by a decoder. HT12E-HT12D

PIN DESCRIPTION RF TRANSMITTER

Pin 1 — Ground [GND]

Pin 2 — Serial Data Input Pin [DATA]

Pin 3 — Power supply; 5V [Vcc]

Pin 4 — Antenna output pin [ANT]

RF RECEIVER


Pin 1 — Ground [GND]

Pin 2 — Serial data output pin [DATA]

Pin 3 — Linear output pin (Not connected) [NC]

Pin 4 — Power supply;5v [Vcc]

Pin 5 — Power supply;5v [Vcc]

Pin 6 — Ground [GND]

Pin 7 — Ground [GND]

Pin 8 — Antenna Input pin [ANT]

  • 1 × RF transmitter receiver module
  • 2 × prototype board
  • 1 × HT12E encoder
  • 1 × HT12D decoder
  • 1 × L293D Motor driver

View all 9 components

  • 1
    Step 1

    Step 1 : Make the power supply

    First we will start with the power supply circuit. Both rf transmitter and receiver circuit need separate power supply The receiver circuit need to powered using 12v supply and transmitter circuit can be powered using 9v battery

    PIN DESCRIPTION OF 7805 IC

    1. Pin 1 — Input voltage (5v-18v ) [V in]
    2. Pin 2 — Ground [gnd]
    3. Pin 3 — Regulated Output (4.8v – 5.2v]
    • IC 7805 which regulates the 12v supply to 5v (if cant get a 12v supply you can use a 9v supply)
    • 0.1uf & 470uf capacitor
    • And 1k resistor for status led

    NOTE: Use heat sink for 7805 because we are dropping 7v (12-5 )so lots of heat will be produced to burn the regulator so use heat sink is recommended

  • 2
    Step 2

    Step 2 : Make the Transmitter

    The transmitter circuit consist of

    1. HT12E encoder
    2. RF transmitter module
    3. Two DPDT switch
    4. and 1M resistor

    You can see i have marked A, B, C, D in the transmitter circuit after the switch and see the DPDT connection diagram below there also you can see i have marked A, B, C, D. Connect A,B,C,D on the transmitter circuit to A,B,C,D on the 2 DPDT switch.

    The DPDT switch connections is shown above.

    HT12E PIN DESCRIPTION

    Pin (1- 8) — 8 bit address pin for output [ A0,A1,A2,A3,A4,A5,A6,A7 ]

    Pin 9 — Ground [ Gnd ]

    Pin (10,11,12,13) — 4 bit address pin for input [ AD0,AD1,AD2,AD3 ]

    Pin 14 — Transmission enable , Active low [TE]

    Pin 15 — Oscillator input [ Osc2 ]

    Pin 16 — Oscillator output [ Osc1 ]

    Pin 17 — Serial data output [ Output ]

    Pin 18 — Supply voltage 5V (2.4V-12V) [ vcc ]

    A0-A7 — These are 8 bit address pin for the output.

    GND — This pin should also be connected to the negative of the power supply.

    TE — This are the transmission enable pin.

    Osc 1,2 — These pins are the oscillator input and output pins.This pin are connected to each other with a external resistor.

    Output — This is an output pin. The data signals is given out from this pin.

    Vcc — The Vcc pin connected to positive power supply, It is used to power the IC.

    AD0 – AD3 — These are the 4 bit address pins.


  • 3
    Step 3

    Step 3 : Make the Receiver

    The receiver circuit consist of 2 IC(HT12D decoder , L293D motor driver),RF receiver module

    Wire the circuit as per the above receiver schematic. There is 2 led in the receiver board ,one lights up when power supply is given to the receiver and the other when power supply is given to transmitter circuit the led near the IC HT12D should lit and this provides you a valid transmission(VT) when power is given at the transmitter if not there is something wrong with your connection or your RF TX RX module NOTE: Use red wire for positive and black for negative if there is any problem with the circuit it will be easy for debugging the circuit

    PIN DESCRIPTION FOR HT12D

    VDD and VSS: This pin are used to provide power to the IC, Positive and Negative of the power supply respectively

    DIN: This pin is the serial data input and can be connected to a RF receiver output.

    A0 – A7: This are the address input . Status of these pins should match with status of address pin in HT12E (used in transmitter) to receive the data. These pins can be connected to VSS or left open

    D8 – D11: This are the data output pins. Status of these pins can be VSS or VDD depending upon the received serial data through pin DIN.

    VT: stand for Valid Transmission. This output pin will be HIGH when valid data is available at D8 – D11 data output pins.


    OSC1
    and OSC2: This pin are used to connect external resistor for internal oscillator of HT12D. OSC1 is the oscillator input pin and OSC2 is the
    oscillator output pin


    L293D (Motor Driver)

    The L293D is a Motor Driver IC it allows the motor to drive on both direction. L293D is a 16-pin IC with eight pins, on each side, dedicated to the controlling of a motor which can control a set of two DC motors at a same time in any direction. With one L293D we can control 2 dc motors ,There are 2 INPUT pins, 2 OUTPUT pins and 1 ENABLE pin for each motor. L293D consist of two H-bridge. H-bridge is the simplest circuit for controlling a low current rated motor.

    PIN DESCRIPTION OF L293D

    Pin 1 — Enable pin for motor 1 [Enable 1 ]
    Pin 2 — Input pin 1 for Motor 1 [Input 1 ]
    Pin 3 — Output pin 1 for Motor 1 [Output 1]
    Pin 4,5,12,13 — Ground [ GND ]
    Pin 6 — Output Pin 2 for Motor 1 [ Output 2 ]
    Pin 7 — Input pin 2 for motor 1 [ Input 2 ]
    Pin 8 — Power supply for motors(9-12v) [Vcc]
    Pin 9 — Enable pin for motor 2 [ Enable 2 ]
    Pin 10 Input pin 1 for motor 1 [Input 3 ]
    Pin 11 Output pin 2 for motor 1 [Output 3]
    Pin 14 Output 2 for motor 1 [ Output4 ]
    Pin 15 Input 2 for motor 1 [ Input 4 ]
    Pin 16 supply voltage ; 5V [ Vcc1 ]

View all 5 instructions

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Discussions

Nishant wrote 07/15/2019 at 09:50 point

encoder ic in receiving circuit?

  Are you sure? yes | no

Abraham wrote 12/19/2015 at 05:26 point

Amazing work my friend 
thanks a lot 
 

  Are you sure? yes | no

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