Posted: 28 Feb 2011 12:27 AM PST

Hi :cean:,

I am thinking about developing a remote controlled car which can be controlled using a TV remote.......

But I have never worked with INFRARED........

Please Help me and tell me HOW A TV REMOTE CONTROL WORKS??? in a simple language and with the help of block diagram..........

I have already GOOGLE it but the language is difficult for me.............

Regards,
VIPUL

Posted: 27 Feb 2011 11:24 PM PST

Recently, i found a useful tool-GstarCAD Tools in GstarCAD, there are many useful drafting tools in it. AutoCAD and other CAD software have no such tools.
I suggest everyone to try it .:)

Help needed for PC-controlled Wireless Notice Board on USART

Posted: 27 Feb 2011 04:22 AM PST

Hey guys,
I'm doing a project on wireless notice board, and my codes are in assembly language
1. The wireless module is zigbee, and it's from pc to PIC,
2. The display is dot-matrix and data will be taken from EEPROM to be displayed
3. Only one way communication using USART from Zigbee to PIC6f628A
4. PIC will receive new data whenever available from ZigBee and store in EEPROM
5. The PC will be sending data through a ZigBee transmitter to the receiver.

So, currently I've got my display unit to work and everything, and can display 128 characters. All of which is pre-loaded into the EEPROM.
I'm having trouble with the communications part. How do I use USART to receive a data string and store into EEPROM one byte at a time? Plus I don't want to do the polling method.

Attached is the codings that i've written.
1. The original code is working fine and i need to embed the USART part into it
2. The Usart RC file is the one I've written for serial communication with ZigBee that needs to be embedded.

The code should work as: Displaying out data from EEPROM and when new data is received, it will take it and store into EEPROM and then start displaying all over again. Please help. Thanks

Here is the Usart part:

Code:

org     0x04        ;interrupt service vector
     movwf    W_Save
     movf     STATUS,W
     clrf     STATUS
     movwf    STATUS_Save
     movf     PCLATH,W
     movwf     PCLATH_Save
 
     movlw    0x00
     movwf    eefile
     
 goto    RCINT
 
     movf    PCLATH_Save
     movwf    PCLATH,W
     movf    STATUS_Save
     movwf    STATUS,W
     movf    W_Save
     retfie
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
     movlw    0xC0    ;setting up the interrupt, goes into the main part
     movwf    INTCON
     movlw    0x00
     movwf    PIR1
 
     movlw    0x68
     bsf    STATUS,RP0
     movwf    SPBRG
     movlw    0xA0
     movwf    PIE1
     bcf    TXSTA,BRGH
     bcf    TXSTA,SYNC
     bcf    STATUS.RP0
 
     bsf    RCSTA,SPEN
     bsf    RCSTA,CREN
     bcf    RCSTA,RX9
 
     bsf    STATUS,RP0
     movlw    0x02
     movwf    TRISB        ;RB1 is the rx pin
 
     end
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 RCINT    movf    RCREG,W
     bsf    STATUS,RP0
     movwf    EEDATA
     bcf    STATUS,RP0
 
     movf    eefile
     bsf    STATUS,RP0
     movwf    EEADR
     bcf    STATUS,RP0
     call    write
     
     incf    eefile,F
     movf    eefile
     bsf    STATUS,RP0
     movwf    EEDATA
     movlw    0x7F
     movwf    EEADR
     bcf    STATUS,RP0
     call     write
 
     bcf    PIR1,RCIF
     retfie    
 
 write    bsf    STATUS,RP0    ;select bank1    ;writes it to EEPROM
     bsf    EECON1,WREN    ;enable write
     bcf    INTCON,GIE        
     movlw    0X55        ;unlock codes
     movwf    EECON2
     movlw    0xAA
     movwf    EECON2
     bsf    EECON1,WR    ;write begins
     bsf    INTCON.GIE
     bcf    STATUS,RP0    ;select bank0        
 writeA    btfss    PIR1,EEIF    ;wait for write to complete
     goto    writeA
     bcf    PIR1,EEIF
     bsf    STATUS,RP0    ;select bank1
     bcf    EECON1,WREN    ;disable other writes
     bcf    STATUS,RP0    ;select bank0                    
     retlw    00

Crazy Engineers .CoM

Monday, February 28, 2011

CrazyEngineers Forum - Electrical & Electronics Engineering

CrazyEngineers Forum - Electrical & Electronics Engineering

No comments:

Post a Comment