Ds18b20

**Acetronics2** · - 14th June 2009, 14:24

Hi, Ahmed

I must admit Fratello's program only shows half degrees ... ( just tested on an EasyPic 5 )

but still have not found Why !!!

Alain

**ahmed_salah** · - 14th June 2009, 14:32

hi,
i am using pic basic pro 2.44 do u think this the problem

**Acetronics2** · - 14th June 2009, 15:00

Hi, Ahmed

I Finally got it !!!

the problem is in the Waiting loop ... that doesn't wait !!!

sooo... add :

Code:

 Busy VAR BIT

at the top of the program

and change :

Code:

WaitLoop:
 
' While not DQ                      ' NOT Working !!!
' Wend

by

Code:

WaitLoop:

OWIn DQ, 4, [Busy] 			' Check for still busy converting

'PORTC.4 = 1				' Show waiting for conv complete

If Busy = 0 Then 

 GOTO waitloop
 
ENDIF

' PORTC.4 = 0

Port C.4 was chosen to show the time the DS is Busy ... very useful tool to verify conversion is really complete !!!

Have fun,

Alain

**ahmed_salah** · - 14th June 2009, 15:21

hi,
so thanks for help now i got resolution 1/100 i am so happy but i want to underestand what no 4 in statement OWIn DQ, 4, [Busy] means ???
i have another question i want to read the o/p to pc serial port i connect 1k resistance to portb.1 and send it to pc rx pin (2) and circuit ground to pc gnd pin (5)
note : i am using usb to serial converter
i update the program just for testing to send a message but i notice that the Rx led on usb to serial converter flashes and nothing out on hyberterminal ????
attached is code