Some ideals on adc - Page 3 - Electronic Circuits Projects Diagrams Free

be80be · 1st July 2009, 04:42 PM

This is the sample code from the data sheet

Code:

      CALL SampleTime     ;Acquisiton delay
      BSF ADCON0,GO       ;Start conversion
      BTFSC ADCON0,GO   ;Is conversion done?
      GOTO $-1                  ;No, test again
      BANKSEL ADRESH      ;
      MOVF ADRESH,W      ;Read upper 2 bits
      MOVWF RESULTHI    ;store in GPR space
      BANKSEL ADRESL     ;
      MOVF ADRESL,W      ;Read lower 8 bits
      MOVWF RESULTLO   ;Store in GPR space

This is the part that your taking about

Code:

 CALL SampleTime     ;Acquisiton delay

I read the adc apnote and the example they gave for the SampleTime delay was

Code:

SampleTime:
           nop   ;1 cycle
           return  ;4 cycles

**Nigel Goodwin** · 1st July 2009, 04:45 PM

Your code is fine Burt, I shouldn't pay any attention to him - you only need to check if the ADC is busy after initiating a read - unless you've initiated a read, it can't possibly be busy.

be80be · 1st July 2009, 07:50 PM

This is from microchip sample code

Code:

MainLoop:
     nop                      ; wait 5uS for A2D amp to settle and capacitor to charge.
     nop                      ; wait 1uS
     nop                      ; wait 1uS
     nop                      ; wait 1uS
     nop                      ; wait 1uS
     bsf       ADCON0,GO      ; start conversion
     btfss     ADCON0,GO      ; this bit will change to zero when the conversion is complete

what I did is the same thing
A call =2 nop =1 return = 1 that's five for A2D amp to settle and capacitor to charge

millwood · 1st July 2009, 08:24 PM

Abusive post deleted - moderator.

24 hour ban for abusive behaviour.

Pommie · 1st July 2009, 08:27 PM

Bad language post deleted - ElectroMaster.

Next time will be a official warning.

kchriste · 1st July 2009, 08:45 PM

Quote:

Originally Posted by Pommie

So, which port of the 16F844 has the analogue input?

Perhaps you should also ask, "Where do I find this mysterious PIC? It doesn't appear on the MicroChip site at all."

be80be · 2nd July 2009, 10:16 PM

Mrdeb here the schematic for the test board I made

MrDEB · 3rd July 2009, 04:13 AM

in the middle of the schematic??

be80be · 3rd July 2009, 04:28 AM

Sorry about that I didn't remove it all it was a 74hc164 but it's not on that board it was on the schematic I thought i remove it all my kids was trying to get me to take them skating and i didn't look it over good I fixed it should make since now.

be80be · 3rd July 2009, 03:15 PM

here all the files mrdeb

AtomSoft · 3rd July 2009, 08:45 PM

Hey Burt i did something like that for the junebug a while back its in the second JPUG. (Junebug Newsletter (Junebug User Guide)

Good Job!!

Check out: #2 June 2008
JPUG the Junebug PIC Users Group Newsletter

Even did a nice PCB layout when you scroll down...

MrDEB · 4th July 2009, 01:19 AM

if I had the sch file then I can finish.
this is the express pcb file for board
how can I post a file??
not really done but its a start.
need sch file or I have to redraw it

be80be · 4th July 2009, 01:40 AM

Here that is

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1st July 2009, 04:45 PM	#32
Nigel Goodwin	Your code is fine Burt, I shouldn't pay any attention to him - you only need to check if the ADC is busy after initiating a read - unless you've initiated a read, it can't possibly be busy. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

1st July 2009, 07:50 PM	#33
be80be	This is from microchip sample code Code: MainLoop: nop ; wait 5uS for A2D amp to settle and capacitor to charge. nop ; wait 1uS nop ; wait 1uS nop ; wait 1uS nop ; wait 1uS bsf ADCON0,GO ; start conversion btfss ADCON0,GO ; this bit will change to zero when the conversion is complete what I did is the same thing A call =2 nop =1 return = 1 that's five for A2D amp to settle and capacitor to charge __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

1st July 2009, 08:24 PM	#34
millwood	Abusive post deleted - moderator. 24 hour ban for abusive behaviour. Last edited by Nigel Goodwin; 1st July 2009 at 08:27 PM.

1st July 2009, 08:27 PM	#35
Pommie	Bad language post deleted - ElectroMaster. Next time will be a official warning. Last edited by ElectroMaster; 4th July 2009 at 11:55 PM.

2nd July 2009, 10:16 PM	#37
be80be	Mrdeb here the schematic for the test board I made Attached Thumbnails __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1 Last edited by be80be; 3rd July 2009 at 04:24 AM.

3rd July 2009, 04:13 AM	#38
MrDEB	what's with the R, GP1 AND GP2?? in the middle of the schematic??

3rd July 2009, 04:28 AM	#39
be80be	Sorry about that I didn't remove it all it was a 74hc164 but it's not on that board it was on the schematic I thought i remove it all my kids was trying to get me to take them skating and i didn't look it over good I fixed it should make since now. __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

3rd July 2009, 08:45 PM	#41
AtomSoft	Hey Burt i did something like that for the junebug a while back its in the second JPUG. (Junebug Newsletter (Junebug User Guide) Good Job!! Check out: #2 June 2008 JPUG the Junebug PIC Users Group Newsletter Even did a nice PCB layout when you scroll down... __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics Last edited by AtomSoft; 3rd July 2009 at 08:46 PM.

4th July 2009, 01:19 AM	#42
MrDEB	PCB file BUT? if I had the sch file then I can finish. this is the express pcb file for board how can I post a file?? not really done but its a start. need sch file or I have to redraw it Attached Thumbnails