this thread is like dying

oh well i wont be online much also

short sem is hell with asgmnet needed to be completed in half of time in long sem

even a person like me who every time type wrong spelling can get band 5.. why not ?

foundation ?

yes u can go any uni as long it revelant with what foundation you are studying

just do credit transfer

why u say me like tat

dont go away..

it finally cool in melaka

2week more exam...

i got 1 last asgmnet on microcontroller

mayb need alien help to check my assembly language.. Mechanical students ask do electronic subject like totaly new

have to slowly test lo see it work or not

btw u mechanical ?

This post has been edited by vapeace: Apr 24 2011, 09:38 PM

finally i am back

any electronic student can help me especially tele ?
i need to transmit 8 bit data between two microcontroller.. so i been finding for a 8 data bit encoder and decoder for my 433Mhz RF module.. but no luck for any in MY

so i planning to use two 433Mhz RF receiver transmitter module, and two 4bit encoder(PT2262) and two 4bit encoder(PT2272) basically combining two 4bit data combine into 8bit data transmission

the problem is now how do i config it so both wont inference with one and another ? do i set both address different ?

btw any1 know pcb printing service around melaka ? and what pcb editor u use ? currently i using freepcb

something like below


This post has been edited by vapeace: May 1 2011, 01:46 PM

^ any help regarding my RF module ?

i also planning to use two 331MHz and 443Mhz to do.. as based on the pt2262 and pt2272 datasheet say i can set address on both so only same address for 1 encoder and 1 decoder

delay method cant be used because i may have to sent 11111111B simultaneously because i will be controlling 4motor and 4 sensor at the same time

BTW where can i get the chemical ?

Two 433Mhz RF receiver/transmitter module, and two 4bit data RF encoder(PT2262) and two 4bit data decoder(PT2272) basically combining two 4bit data transmission into 8bit data transmission.
Both set of encoder/decoder will have different set of address;

Top encoder/decoder address = HHFFHHLL
Bottom encoder/decoder address = LLHHFFHH

my friend say use this method.. can avoid interference because when transmitting.. the decoder will check for address match or not before decode it.. even u send two same frequency signal only one decoder that is set to the similar encoder address will decode the RF signal via versa

other way to adjust the antenna cable length to have a slight frequency differential. like 433.000Mhz and 433.125Mhz

Can or not ?

lecturer give more simple solution

2 20pin uc, 1 pair of 4bit decoder/decoder, RF 433MHz receiver and transmitter module

1) input 8bit into uc and send the upper 4 bit first to the encoder
2) swap lower 4bit and send to encoder again
3) Save the first 4bit into into R0
4) Save the second 4bit into A and swap
5) Logical AND RO and A send to output <- full 8bit data transmission
the only problem is the transmission delay(the time decoder/encoder need to encode and decode) to the time the uc fully assemble and disassemble the 2 4bit into 8bit
can be adjusted by using higher frequency oscillator in the uc to faster assemble and disassemble 8bit data.. call delay in the uc so the decoder and encoder can fully transmit the 2 4bit data

there u have a RF transmitter and receiver module.. with 8 channel and 8bit data transmission capabilities.. Time to build my prototype after exam

save cost.. BUT now i need to find a 20pin programmer i only have 40pin mia.. can fit 20pin to 40pin programmer ?

any1 have any idea wher i can get a 20ping programmer that work with MCS-51 code

just now.. got one guy go toilet

the invigilator ask for his hp then oni allow him go in..

Panas nak mampus

no.. unless u outstation then u need someplace to live
just pen and pencil
yes.. orientation is mostly formal wear.. last day oni batik

it meant to be fun and games, but some consider it boring anyway. But i suggest u to go to know how mmu work and where the place bla bla

lol/...............

his naiviness cure your heart ?