how to do Remote control program

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Nipuna56

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i want to make remote control led On/off circuit using 433Mhz RF transmitter and receiver
how can i do that
 


i want to make RC car but i did't know how data transmit through 433Mhz RF transmitter and receiver
For that i want to on/off led as my first step
 

For this, you shouldn't need to use any micro controller.

Just go through the following circuit and tutorial... If you found any difficulty to understand, edaboard is always there.


And do read the datasheet of HT-12E & HT-12D to know the concept why you need it.
& if you still want to use micro controller then you can replace HT-12E & Ht-12D from Rx & Tx side with Controller, and do the programming to fulfill the task of encoding.

Hope this helps you.
All The Best.
 

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if you still want to use micro controller then you can replace HT-12E & Ht-12D from Rx & Tx side with Controller
Click to expand...

i feel hard to understand this
 

Nipuna56 said:
i feel hard to understand this
Click to expand...

The HT-12E and HT-12D pair simply provide encoding and decoding of a small number of states.

The same can be accomplished with a pair of microcontrollers which also encode and decode a finite number of states.

Typically an encoding/decoding algorithm, such as Manchester Encoding, is required when using simple ASK type TX/RX pairs.

The following document outlines a method of utilizing a MCU's RS-232 UARTs to implement a Manchester Encoding scheme:



Of course a simple finite state machine (FSM) would need to be implemented as well.


BigDog
 
HT-12E and HT-12D has only 4 data input and output pins is there any other chip has more than that?
 

How much data you need?
As per your goal, to make a remote controlled car this 4 pins are enough for you.
You can have total 2^4 = 16 combinations out of these 4 pins.
you require to send :

"1010" for forward
"0101" for backward
"0110" for left
"1001" for right

at Rx side give these 4output pins of HT-12D to Motor driver...
hope you get this
 

The four data pins represent sixteen unique states, I would think a reasonable number for a RC car.

There are similar encoder/decoder devices available with more data lines, of course compatibility with your existing RF TX/RX needs to be verified:

Radiometrix CTA88

Radiometrix CTR124


However, if your main task is the transmission of data or representation of a exceedingly large number of states, I might consider taking a different route.

Nordic manufactures several RF data transceivers, one particularly popular device is the nRF24L01+ which offers a standard SPI interface.

nRF24L01+ Ultra low power 2.4GHz RF Transceiver

If you search eBay for nRF24L01+, you come across numerous modules which incorporate the chipset with a pair priced in $3 to $4 range.

For Example:
**broken link removed**

BigDog
 

thank you senor
my receiver has only 4 pins
**broken link removed**

but i saw lots of tutorials in 8 pin receivers
is there any different between among them
 

Difference is of max. capacity of sending Data.
with 4 pins you can send max. 16 combinations(2^4 data) [without any MCU]
with 8 pins you can send max. 296 combinations(2^8 data) [without any MCU]

For your application (wireless car) 4 pins are enough.
you need to use total 5 combination,
"0000" for stop
"1010" for forward
"0101" for backward
"0110" for left
"1001" for right
 

i think you mentioned about RC IC
But i mentioned about

this is my one





receiver has only 4 pins

but lots of circuit diagrams based on 8 pin receivers
 

Nipuna56 said:
HT-12E and HT-12D has only 4 data input and output pins is there any other chip has more than that?
Click to expand...

The HT-12E and HT-12D are encoder/decoder devices and do NOT offer a method of transmitting or receiving a signal.

Nipuna56 said:
i think you mentioned about RC IC
But i mentioned about

this is my one

View attachment 80912

receiver has only 4 pins

but lots of circuit diagrams based on 8 pin receivers
Click to expand...

The devices in the photo are ASK transmitter and receiver modules and do NOT provide any method of encoding or decoding.



You have referred to two entirely different devices which have two entirely different purposes.


BigDog
 

@ Nipuna, There is no difference between the one which you've post and the one which you've in your tutorials.

If you observe both of them carefully then in 8 pins Rx module you'll find 2 pins of Vcc, 2 pins of Gnds, 2 pins of Data, 1 for antenna & 1 for NC (no connection); & in the Rx module with 4 pins you'll find 1 Pin for Vcc, 1 pin for Data, 1 for Gnd & 1 for Antenna.

NO DIFFERENCE IS THERE.

I've used both, so you can handle your Rx modules with the tutorials you've without any hesitation.

As bigdogguru said you've select ASK module but whatever you select ASK/FSK module you can follow the same concept without being confused, just start it first; you'll get cleared once you get the blinking LEDs on Rx side.

All the Best.
 

are we want to connect antenna for this circuit?
what kind of thing is suitable for as antenna?
 

The TX module will have Vcc - 5volts, Gnd- negetive, Data IN -from HT12E and Ant-Just a piece if wire..Just connect it respectively.
On RX module you'll see Vcc - 5volts, Gnd- negetive, Data out -from HT12D and Ant-Just a piece if wire...
For antenna any piece of wire about 15 cms will get good range. For testing on table no antenna is required.
Cheers
 

Nipuna56 said:
how they transmit signals without antenna?
Click to expand...

If your Rx-Tx are too near then the pin's length of the Antenna is enough to work as antenna for that particular distance.
As per my experience I've Received data without antenna from 7-8 feet.

And for the better range(I've got 25-30 meter) take a wire of same length(I've used 30cm) at both the side.
Make spiral shape through the antenna wire as to have a 30cm wire at remote/car side may be not a convenient option so make a spiral roll type shape from the wire of 30 cm, and then use it as antenna at both side.
 

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