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Do i need 8051???

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05438560

New Member
Hi im using an 8051 in a transmitter circuit, the MCU just continuously outputs an 8bit code which is connected to an rf transmitter. My question is do i need an 8051 for such a simple task? I am only thinking about an 8051 because i have used it before but is there a simpler alternative? size of the board is a factor. smaller the better as a person will have to carry around the board.
Thanks
 

bananasiong

New Member
Hi,
You need the microcontroller to perform Manchester coding for the RF module. Or else you'll need a pair of encoder and decoder chip.
 

ronsimpson

Well-Known Member
Most Helpful Member
I think you are outputting this.
(10010100)00000000000000000000000000000(10010100)00000
There is an 8 bit serial number then 100mS of “0” then the 8 bit again.
A 40 pin 8051 is too big. There are some very small 8051s. I have used 8051s form SiLabs with 10 pins. NXP has parts with 8 pins.

On a different note MicroChip has parts with only 6 pins. You will have to bit bank to make a serial port.

If size is important then look for parts with internal OSC and internal POR. If you cannot do surface mount then use an 8 pin dip + 1 bypass cap. (no crystal OSC)
 
go to futurlec.com and search for Holtek HT12E and Holtek HT12D.

These are an encoder/decoder pair normally found in keyfob remotes.
I used a couple of these units, very easy and they work great!
 
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