[PIC] 16F877A with DS18B20 Thermometer.

[cagrikrdnz]

Hi guys. I have to program 16F877A to use it in the laser cooling system. I know how 877A and 18B20 works. However, I should do it in C which I am completely foreign. I know assembly from 8051 but assembly for PIC also a little rough for me. Any kind of help will be appreciated. How can I find basic thermometer codes for 16F877A and DS18B20 in both assembly and C.

 

[ZASto]

If it's not a homework, you can do it in Proton+ (BASIC)

MeasureTemperature:
	OWrite DQ, 1, [$CC,$44]
	Repeat
		DelayMS 5
		ORead DQ, 4, [C]
	Until C <> 0
	OWrite DQ, 1, [$CC, $BE]
	ORead DQ, 2, [Temperature.LowByte,Temperature.HighByte]
	
	If Temperature.11 = 1 Then
		Prefix = "-"
		Temperature = ~Temperature + 1
	Else
		Prefix = "+"
	EndIf
	Whole = Temperature >> 4
	Decimal = (Temperature.LowByte & %00001111) * 100 / 16
	Print At 1, 1, "Temp:", Dec Whole, ".", Dec2 Decimal, " C"
Return

A snipet of code that I regularly use.

HTH

 

[cagrikrdnz]

Thank you for your fast response. There are other codes (giving feedback to pump, variable duty cycle for fans, etc) related with the business that written in MPLAB and mikroC. One way or another I have to decide language and then compiler. I will try proton+ . If it is ok with me, I can go along with it.

 

[wp100]

Hi,

If you want Pic assembler then this sites code is good, use it myself.
Should run on a 877a with minimal modification
https://bogdi.ro/electronics/digital%20clock/

 

[irfan ahmad]

i will recommend you c language .
here is proteus simulation and c source file .