temp probe project using DB18S20

MrDEB

Well-Known Member
Finally getting back to this project.
Started hacking at the code but wondering where to put the math computations discussed at the beginning of this subject?
Tf=(9xTc / 5 + 32 something to do with floating integers?
Another question is TEMP A and TEMP B variables. I have TEMP A() TEMP B()
Not sure how to access different temp inputs
Need to add the LED sequence (if cooler is too cold , GREEN LED to flash. Too warm RED LED to flash.
planning on making ports HIGH, LOW, or HIGH Impedance (have two LEDs 1GREEN & 1RED per port )
as for ROMID #'s going to just breadboard the probes then warm each seperatly to indicate then number each temp probe then install into application.
Code: 
Device = 18F452
Clock = 20
 
// import modules...
Include "DS18B20.bas"
Include "convert.bas"
Include "LCD.bas"
///
#option LCD_DATA = PORTD.4              // Assign the LCD connections
#option LCD_EN = PORTD.3                //
#option LCD_RS = PORTD.2                //


 
// working variables...
Dim
   
   TempA(3) As ShortInt,
   TempB(3) As Word,
   LED(7)As Word,
   Port RA.0 As LED(0),   // HIGH = RED leds , LOW = GREEN leds
   Port RA.1 As LED(1),   //
   Port RA.2 As LED(2),   //
   Port RA.3 As LED(3)   // ############################
 
// Start Of Program...
SetBaudrate(br19200)
SetPin(PORTC.0)  // temp probes connect
 
// 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...
 
If DS18B20.Find Then
    While true
      Convert
      GetTemp(TempA(), TempB())
LCD.WriteAt(1,1,"WALK IN COOLER")(DecToStr(TempA(0)),".",DecToStr(TempB(0),4), " C", 13, 10)          // Send some text to the LCD   
LCD.WriteAt(1,2,"GLASS DOOR COOLER")(DecToStr(TempA(1)),".",DecToStr(TempB(1),4), " C", 13, 10)          // Send some text to the LCD  
LCD.WriteAt(1,3,"METAL DOOR COOLER")(DecToStr(TempA(2)),".",DecToStr(TempB(2),4), " C", 13, 10)          // Send some text to the LCD  
LCD.WriteAt(1,4,"KoC BEER COOLER") (DecToStr(TempA(3)),".",DecToStr(TempB(3),4), " C", 13, 10)         // Send some text to the LCD     
      
     
      DelayMS(1000)
    Wend  
Else
 
You don't need floats. Just do the multiply first. So,
Code: 
     Tf=Tc*9
     Tf=Tf/5
     Tf=Tf+32
The swordfish library takes care of the rom search and so that should be straight forward.

Mike.
 
If you take a closer look at Mike's (Pommie's) code you'll see it's in the exact same order as the code from the Gentleman on that other thread.

Mike
 
Last edited:
The code I started with to read the temp sensors has a USART instead of LCD.
is there a certain protocall to convert from USART to useing an LCD?
 
here is what I started with

added the LCD bas but nothing is displayed.
Code: 
// device and clock speed...
device = 18F452
clock = 20

// import modules...
#option OW_PIN = PORTC.0
include "DS18B20.bas"
include "convert.bas"
include "usart.bas"

// FAMILY $28 ($1D) ($0000002CDBAE) <- DS18B20
// FAMILY $28 ($3F) ($0000002CD16E) <- DS18B20
const Sensor_A(8) as byte = ($28, $AE, $DB, $2C, $00, $00, $00, $1D)
const Sensor_B(8) as byte = ($28, $6E, $D1, $2C, $00, $00, $00, $3F)

// display a sensor value...
sub DisplaySensor(byrefconst pID() as byte)
   dim TempA as shortint
   dim TempB as word
   RomID = pID
   Convert
   GetTemp(TempA, TempB)
   USART.Write(DecToStr(TempA),".",DecToStr(TempB,2), $BA, "C",13,10)
end sub

// program start...
SetBaudrate(br115200)
while true
   DisplaySensor(Sensor_A)
   DisplaySensor(Sensor_B)
   delayms(1000)
wend

here is what I have tried doing
Code: 
Device = 18F452
Clock = 20

#option LCD_DATA = PORTD.4       // Force QL-200 board to use 8-bit data bus
#option LCD_RS = PORTD.3        // LCD RS pin Port A, pin 1
#option LCD_EN = PORTD.2        // LCD EN pin Port A, pin 3
//#option LCD_RW = PORTA.2        // LCD RW pin, Port A, pin 2
Const updateMS = 50  //LCD refresh
Include "DS18B20.bas"           // Include DS18B20 library
Include "utils.bas"             // Include utilities library
Include "convert.bas"           // Include convert library
Include "LCD.bas"               // Include LCD library

Dim
TempA As ShortInt,
TempB As Word

SetAllDigital                   // All I/O ports set to  digital
SetPin(PORTB.0)                 // Set 18B20 data pin  pin 33


While true
//DelayMS(1000)                   // Delay 1 second
DelayMS(250)                            // Let the LCD warm up
LCD.Cls                                 // Clear the LCD screen
LCD.WriteAt(1,1,"I love Sue")          // Send some text to the LCD
If DS18B20.Find Then
Convert
GetTemp(TempA, TempB)           // Get temperature from 18B20
LCD.WriteAt(1,2,DecToStr(TempA),".",DecToStr(TempB,4), "C")
Else
LCD.WriteAt(2,1," No device found ")
EndIf
Wend
I tried changing the input port from RB0 to RC0??
 
making progress??

Well I changed the code (copied from DIY site. Now I at least get NO DEVICE FOUND
I guess the temp input is not configured right?
Code: 
device = 18F4520
clock = 20

#option LCD_DATA = PORTD.4        // Force QL-200 board to use 8-bit data bus
#option LCD_RS = PORTD.2        // LCD RS pin Port D, pin 21
#option LCD_EN = PORTD.3        // LCD EN pin Port D, pin 22
//#option LCD_RW = PORTA.2        // LCD RW pin, Port A, pin 2

include "DS18B20.bas"           // Include DS18B20 library
include "utils.bas"             // Include utilities library
include "convert.bas"           // Include convert library
include "LCD.bas"               // Include LCD library

dim
TempA as shortint,
TempB as word

SetAllDigital                   // All I/O ports set to digital

SetPin(PORTC.0)                 // Set 18B20 data pin

while true
delayms(1000)                   // Delay 1 second
if DS18B20.Find then
Convert
GetTemp(TempA, TempB)           // Get temperature from 18B20
LCD.WriteAt(1,1,DecToStr(TempA),".",DecToStr(TempB,4), "C")
else
LCD.WriteAt(2,1," No device found ")
endif
wend
 
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