Do i need 8051??? - Electronic Circuits Projects Diagrams Free

05438560 · 1st May 2008, 01:15 PM

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 · 1st May 2008, 01:24 PM

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 · 1st May 2008, 01:31 PM

I think you are outputting this.
(10010100)00000000000000000000000000000(10010100)0 0000
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)

johnsmith123 · 2nd May 2008, 12:00 AM

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!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
hyperterminal communication w/ 8051	spyghost	Micro Controllers	8	22nd May 2008 10:54 AM
8051 Microcontroller (Urgent Help)	UAE_Engineer	Micro Controllers	5	22nd March 2007 11:13 AM
Could I get away with this? (8051 + AM29F010B)	mstechca	Micro Controllers	0	9th March 2006 02:04 AM
interfacing 16*16 matrix display with 8051	pmphilip	Micro Controllers	0	1st February 2005 03:47 AM
8051 "data" storage within program memory - how?	L0D\|Mr_B	Micro Controllers	1	11th January 2004 02:56 PM

1st May 2008, 01:15 PM	(permalink)
05438560	Do i need 8051??? 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

1st May 2008, 01:24 PM	(permalink)
bananasiong	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. __________________ Superman returns..

1st May 2008, 01:31 PM	(permalink)
ronsimpson	I think you are outputting this. (10010100)00000000000000000000000000000(10010100)0 0000 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)

2nd May 2008, 12:00 AM	(permalink)
johnsmith123	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!