voltage difference

[pouchito]

Hi Dudes

need your help please

I m doing a project using PIC (any PIC) that have to read 2 voltages V1 and V2.
then will subtract V2-V1 which will result a value called :difference

Compare the "difference" to some values (i think i must create a table here)

for example if 1<difference < 2 output " correct" on a LCD

I am new to picbasic pro and i need your help to write this code in the subtraction and comparison Parts.

Thanks in advance

 

[donniedj]

See device under test datasheet. There you find all without need to go outside what it tells you to do.

Cblock 0x20 (you Know The Story)
Value1, Value2, Difference
Table:10
Endc


;configure Ports
;configure Adc
;turn This On
;turn That Off


Call Initialize_lcd
Main:

Call Capture_adc
Call Get_difference
Call Update_lcd

End_main


;-----------------------
Capture_adc
;see Device Datasheet
Return
;------------------------

;------------------------
Get_difference:
Movf Value1, W
Subwf Vaue2, W
Movwf Difference
Return
;-------------------------

;-------------------------
Update_lcd:
Movf Difference, W
Subwf Table+x, W
Btfss Status, Z
Goto Show_fail
Goto Show_pass

Show_pass
Call Lcd_send_pass
Goto Update_lcd1

Show_fail
Call Lcd_send_fail
Goto Update_lcd1

Update_lcd1
;do Any Other Stuff
Return
;--------------------------

 

[pouchito]

thanks a lot donniedj for your help
I will try it

can anyone help me writing it in PICBASIC PRO ?

 

[Pommie]

Call Initialize_lcd
Main:

Call Capture_adc
Call Get_difference
Call Update_lcd

End_main

;-------------------------
Update_lcd:
Movf Difference, W
Subwf Table+x, W
Btfss Status, Z
Goto Show_fail
Goto Show_pass

What language is that?

Mike.

 

[pouchito]

isn't this assembly???

 

[Pommie]

isn't this assembly???

Sorry if I confused you, the above code is mainly assembler but with some misleading syntax in it. The Main ... End_Main is not a valid way to write the main loop and the Subwf Table+x,W instruction suggests that some form of indexed addressing mode is available. I just think this example code is confusing.

Mike.