# about rf encoder and decoder

#### hamidouuu12

##### New Member
Hello all ,
i just wanted to make a simple wireless circuit using rf transsmitter without arduino or even programming . I have seen many videos using Rf transmitter 433Mhz module , HT12E / HT12D coder /decoder and other components , but as i said they didn't use arduino so they used only 4 channels of the coder and decoder

i just want to know why just 4 channels ? and how can i add more channels . if that is impossible with those encode/decoder , with what can i replace them to have more channels and how can i connect them ?
hope you help me and sorry if some technical words are missing

#### Nigel Goodwin

##### Super Moderator
4 channel because they are only 4 channel IC's - if you want more, then use an Arduino or other processor.

#### hamidouuu12

##### New Member
4 channel because they are only 4 channel IC's - if you want more, then use an Arduino or other processor.
with what can i replace them ?

#### Nigel Goodwin

##### Super Moderator
As I said, an Arduino or other processor.

#### hamidouuu12

##### New Member
As I said, an Arduino or other processor.
can you give me another ic models

#### Nigel Goodwin

##### Super Moderator
Exactly what are you trying to do?

#### hamidouuu12

##### New Member
Exactly what are you trying to do?
I want to build an rc car with 5+ movements ( 1 go forward / 2 go back / 3 go right / 4 go left / 5 light / etc ...) each one have its button.
Wich ic decoders/encoders can i choose ? or if there is another solution tell me (except arduino and programming)
Hope you understand me
Thanks.

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#### Les Jones

##### Well-Known Member
Why not use the same system that many radio controlled models use. Pulse width modulation. That would give you proportional control on each channel rather than just on/off control. If you only want on/off control of up to 8 channels you could use a UART each end of the link. It is many years since I last used UARTs and they were in a 40 pin DIL package. I don't know if they are still available as most microcontrollers have built in UARts and cost less than I remember paying for a UART IC.

Les.

#### Nigel Goodwin

##### Super Moderator
I want to build an rc car with 5+ movements ( 1 go forward / 2 go back / 3 go right / 4 go left / 5 light / etc ...) each one have its button.
That's a REALLY, REALLY crap way of trying to control a model car, and will be essentially undrivable.

As Les said, use a proper PWM R/C system, as used for model cars - you can buy them at very reasonable cost, and make a proper model.

#### Pommie

Here in Australia I can buy a fully proportionaly controlled car for -$20. So, I'd guess the same for something like £10 in th UK. Don't know where OP is but they're just not worth building anymore. Mike. #### Nigel Goodwin ##### Super Moderator Most Helpful Member Here in Australia I can buy a fully proportionaly controlled car for -$20. So, I'd guess the same for something like £10 in th UK. Don't know where OP is but they're just not worth building anymore.

Mike.
Well they probably are if you're building a decent one, but obviously not just for cheap toys. But even for a decent one, you're probably better off starting with a Tamiya (or similar) kit.

#### hamidouuu12

##### New Member
Why not use the same system that many radio controlled models use. Pulse width modulation. That would give you proportional control on each channel rather than just on/off control. If you only want on/off control of up to 8 channels you could use a UART each end of the link. It is many years since I last used UARTs and they were in a 40 pin DIL package. I don't know if they are still available as most microcontrollers have built in UARts and cost less than I remember paying for a UART IC.

Les.
Thanks for the answer but actually i am not an electronic's expert so i can not understand those technical tips.
I just wanted to apply what i have seen in some videos about a wireless circuits using rf transmitters 433 but instead of 4 channel encoder/decoder i want a bit more (6 channels for example)