After ice age, nomadic age and others today we are living in a age called computer age. I need not tell you about the importance of computers and its effects on day to day life. Even wireless has become a common word. Scientists are spending their nights awake diligently trying to make everything wireless. You will be surprised to know that even charging of mobile has gone wireless. Sounds incredulous, but true. Here I am going to explain you how to make a wireless car. With the advent of IC's, it has become very simple.
The components required are:
Transmitter: Receiver:
RF module 433/315 Mhz ASK type.
Encoder IC A5882E Decoder IC 5883A
Battery(9V) Batteries(9V and 12V)
Talk switch Driver IC L293D
Diodes(12) IC 7805
Antenna Antenna
Some registers are also required. To make your work simpler I would recommend to go to an Electronics Shop and ask for wireless Car 413 Mhz ASK type kit*. You will find everything you require except motors and tyres. In Mumbai you will get everything on Lamington road in Grant Road.
Cost of kit=Rs1000.
*Many wireless kits are available. Yours might be different from what I have specified.
Now in order to control say one motor, we require 2 bits of information while we need 4 bits of information to control 2 motors. The RF module used here is 433/315Mhz ASK type.
Block diagram of entire circuit:
Transmitting unit consists of transmitter module and encoder circuit.
The switches are connected to encoder 5882E which will encode the information and send it to transmitter module.
Receiving unit consists of receiver to receive the information, decoder to decode the data and driver IC to drive the two motors.
In order to drive motors, we need to connect a suitable motor driver at the output of the decoder IC. The motor driver circuit can consist of a Relay, transistorized H-Bridge or motor driver ICs like the L293D, L298 etc.
This schematic shows the use of L293D to drive a pair of DC motors/Geared Motors. The motor supply voltage can go up to 24Volts safely. But the IC supports a maximum of only 600mA current/channel; which is more than enough to drive small DC geared motors.
Add 0.22uF capacitors across both the motors to reduce the effect of noise on the circuitry. We can also add 100uF capacitor between the motor supply pin and the Gnd. Connections M1-A and M2-B correspond to Motor 1 while connections M2-A and M2-B correspond to Motor 2. These control inputs can be connected to any logic circuitry or a microcontroller.
For any queries or explanations you can contact me on rashid301@gmail.com and write a comment below.
how does the encoder have 4 inputs in the form of switches to 1 serial output which is given to the transmitter module?
ReplyDelete@Mehmoodul Hassan
ReplyDeleteencoder is also parallel to serial converter.. the four i/p,s are from four buttons of remote control. the information is sent serially.
what is the value of resistance in the decoder? it is not clear...please help...
ReplyDeleteEncoder A5882 has resistance of 1MΩ
Deleteand Decoder A5883 has resistance of 100KΩ
In my kit dp sw settings not clear, for Encoder A5882 is dpsw 5 and 7 are open(off) or only 5 is off. Similarly for decoder A5883 are 1 and 5 open(off)?
DeleteAlso kit 4 motors , Is it correct or only 2 motors to be used and at rear drive ?
Both 5 and 7 pins are not connected for both encoder and decoder. They were not required with 2 motors. However You have 4 motors and it is fine to use all of them.
DeleteFollow the specification provided in your kit carefully for correct implementation. Connecting wrongs pins can destroy your IC.
Thank you so much for your prompt response. I do not know if people use 4 motors or if it will work well or if it will strain/load the circuit. Will dip switch settings change with 4 motors? Also what about pin 1 of decoder. The kit is from Mumbai based Vegakit in which for decoder pin 1 and 5 are open and 7 is closed , is it correct? I will restudy and ask a few more questions
DeleteHi, For dip switch settings, you can customize by connecting the dp pins from decoder to driver ic the way you want. Since you have bought vegakit, I think you should be having a diagram explaining all the connections. Do you have 2 driver ics for 4 motors?
Delete