ketdv
Newbie level 1
avr 7135
Hi all
I have a project that is: design a extra circuit ( use AVR - AT90S8515 ) to read data from postal scale and send to PC. But I have difficulty that is decode data ( I parallel read from AT89C4051 to LCD driver ):
Discription of Postal scale:
Load cell ->Amplifier -> fillter -> ADC (7135) -> AT89C4051 -> LCD driver -> LDC display ( 4-1/2 digit).
- Postal scale has no interface output ( for example : RS- 232)
- MCU AT89C4051 read data from ADC 7135 and calculate to real load and send to LCD driver ( I don't know the names of LCD driver - I think it's made in China ). MCU interface with the LCD driver over 3 wire: CS, WR(clock), DATA and the data format is:
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 9 ) ( Add= 8 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 7 ) ( Add= 6 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 5 ) ( Add=4 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 3 ) ( Add= 2 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 0 )
101 : command code.
A5..A0 : memory address:
D3..D0 : data
Postal scale use LDC 4-1/2 digit to display the data the segment list is: segment for 4 and 1/2 digit( 1,8,8,8,8) and "kg"; "lb";"<";"<";"-";"o"
I have picture of LCD but Ican't attach here if you need I can send to you over email.
Discription: My extra circuit:
I use 3 pin of AT90S8515 to interface with postal scale over (CS,WR, DATA - that AT89C4051 send resuilt of load to LCD driver ). I have read the Address and DATA ( folowing format is list above ). But I can't decode the data.
Hi all
I have a project that is: design a extra circuit ( use AVR - AT90S8515 ) to read data from postal scale and send to PC. But I have difficulty that is decode data ( I parallel read from AT89C4051 to LCD driver ):
Discription of Postal scale:
Load cell ->Amplifier -> fillter -> ADC (7135) -> AT89C4051 -> LCD driver -> LDC display ( 4-1/2 digit).
- Postal scale has no interface output ( for example : RS- 232)
- MCU AT89C4051 read data from ADC 7135 and calculate to real load and send to LCD driver ( I don't know the names of LCD driver - I think it's made in China ). MCU interface with the LCD driver over 3 wire: CS, WR(clock), DATA and the data format is:
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 9 ) ( Add= 8 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 7 ) ( Add= 6 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 5 ) ( Add=4 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 3 ) ( Add= 2 )
101 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
( Add= 0 )
101 : command code.
A5..A0 : memory address:
D3..D0 : data
Postal scale use LDC 4-1/2 digit to display the data the segment list is: segment for 4 and 1/2 digit( 1,8,8,8,8) and "kg"; "lb";"<";"<";"-";"o"
I have picture of LCD but Ican't attach here if you need I can send to you over email.
Discription: My extra circuit:
I use 3 pin of AT90S8515 to interface with postal scale over (CS,WR, DATA - that AT89C4051 send resuilt of load to LCD driver ). I have read the Address and DATA ( folowing format is list above ). But I can't decode the data.