Why does my 18F1320 take 33seconds to reset? - Page 2 - Electronic Circuits Projects Diagrams Free

Pommie · 10th May 2008, 04:20 PM

Quote:

Originally Posted by SPDCHK

I'm now "playing" with the DS1820 1-wire temperature sensor chip, modifying the example code for the 18F1320, and not USART but LCD.

You may find this interesting.

Mike.

SPDCHK · 10th May 2008, 04:58 PM

I have noticed that there are two different libraries. The chip I got is the DS1820. NO S or B in the name. What I did find is that the DS18S20 lib worked in Swordfish. I modified it for the 18F1320 chip and read the input on PortA<0>. I tested the circuit with melting and boiling water. in the ice it came down to about 0.5°C, but the boiling water only got to 87°C. Up here in Johannesburg (being about 1650m above sea level) it's normal for water to start boiling in a kitchen kettle at 90°C

Code:

Device = 18F1320
Clock = 8

// import modules...
Include "IntOSC_1320.bas"
Include "convert.bas"
Include "LCD.bas" 
Include "DS18S20.bas"
Include "utils.bas"

Dim 
   TempA As ShortInt,
   TempB As Byte    // for the DS18S20.bas lib this is a WORD
SetPin(PORTA.0)

// Find() will search the bus for a single DS1820 device
// and load its ROM ID into the DS1820 public variable RomID - you
// could do this manually. For example, RomID = MyRomID...

SetAllDigital
If Not Find Then
LCD.Cls                                 // Clear the LCD screen
LCD.WriteAt(1,1,"No device found")          // Send some text to the LCD
Else
   While true
      ConvertAll
      GetTemp(TempA, TempB)
      LCD.WriteAt(1,1,Convert.DecToStr(TempA),".",DecToStr(TempB)," C")   //
      LCD.WriteAt(2,1,GetTempAsStr, " C")                                       // The same as the line above
      DelayMS(500)
   Wend
EndIf

gramo · 10th May 2008, 11:08 PM

The DS18S20 uses a bandgap temperature sensing rather than the dual-oscillator architecture used by the DS1820, this difference is invisible to the user

The main difference between the two parts is the temperature conversion time: DS1820 = 500ms (max) and DS18S20 = 750ms (max)

In most applications, DS18S20 is software compatible with the DS1820

gramo · 10th May 2008, 11:11 PM

Quote:

Originally Posted by SPDCHK

Gramo,

I suppose that's why they pay you the BIG BUCKS hey?

I wish... the only donation I've ever recieved from my site was from my mother

I wasn't trying to ninja pommies post, just providing a different solution that didn't involve system libraries

Pommie · 11th May 2008, 01:12 AM

Quote:

Originally Posted by gramo

just providing a different solution that didn't involve system libraries

I provided that solution as well.

Mike.

10th May 2008, 11:08 PM	(permalink)
gramo Experienced Member Blog Entries: 2	The DS18S20 uses a bandgap temperature sensing rather than the dual-oscillator architecture used by the DS1820, this difference is invisible to the user The main difference between the two parts is the temperature conversion time: DS1820 = 500ms (max) and DS18S20 = 750ms (max) In most applications, DS18S20 is software compatible with the DS1820 __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net

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