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PIC16F877A senior design project NEED HELP

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ericgibbs

Well-Known Member
Most Helpful Member
hi Elizabeth,
The reason for asking your location is because it seems when I am close to closing down you are starting up.. :)

These are asm tutorials from Nigel Goodwins site.



Specific to your project are the 7seg LED mux and Analog tutorials.





This one for switches.


You could easily adapt these to suit the project.

IIRC 'Bill' of Blueroom electronics has done some programming for the HS1101 sensor.?

Why dont you write up a program for the LED's and post it, then we can work thru it with you. Likewise the analog module.

I hope you are finding these posts helpful, if not ask specific questions.;)
 

blueroomelectronics

Well-Known Member
Hardware yes with the HS1101, software very basic but I cheated :) Insteaded of a frequency counter it was simple to connect a spare I/O pin to the 7555 reset pin and the output to one of the CCP inputs. Easy.

I agree, as a first PIC project you've got quite an effort ahead of you to complete it by May 9.
 

engineergirl27

New Member
Thank you, those will help. I am just getting frustrated with myself, because this all seems so new to me. I have had the semester to work on it, but we have also had to do tons of business work for marketing the product, and everything else. We don't get enough training with the programming, at school, we need to teach ourselves.

So thanks, I will be back with more specific questions if I have any.

Elizabeth
 

engineergirl27

New Member
Hey guys,

So I have more of a program written, It still isn't what it needs to be but i have a specific question, here is the code that i have

include <p16F877a.inc>
LIST p=16F877a
errorlevel 1,-302 ;to disable MPLAB bank warnings.
__config _XT_OSC & _PWRTE_ON & _WDT_OFF &_LVP_OFF
;
;Some versions of MPLAB use _LVP_OFF
;This sets all portB pins to output.
;Variables
cblock 0x20 ;start of general purpose registers
count
endc
;/*---------Init Ports
bsf STATUS,RP0
MOVLW B'00000001'
MOVWF TRISA ;All outputs except RA0.
MOVLW B'00000011'
movwf TRISD
CLRF TRISB ;RA0 is wiper of 50k pot/Vin
movlw b'11111111'
movwf TRISC ;PortB is 8 LED output to show

;/*-----Set up A2D parameters
MOVLW B'00001110' ;Hex value of Vin from pot.
MOVWF ADCON1 ;left justified, RA0 = input
MOVLW B'11010111' ;prescaler 1:256 tmr0, internal clock
MOVWF OPTION_REG
BCF STATUS,RP0

;/*---------Set up chip parameters
Start CALL A2D
MOVWF PORTB ;output Hex value to LEDs



PC clrf count
BTFSS PORTD,0
bsf count,0

BTFSS PORTD,1
bsf count,0

BTFSS count,0
goto Start

movf PORTC,w
movwf PORTB

goto PC


A2D
MOVLW B'01000001' ;a2d = on, ch0, fosc/8
MOVWF ADCON0
;/*-----Delay loop to settle A2D, similar to de-bounce???
mnloop btfss INTCON,T0IF ;50us loop delay @ 4Mhz
goto mnloop
;/*-----Stop timer0 interrupt
BCF INTCON,T0IF
BSF ADCON0,GO_DONE ;start a2d conversion
WAITA2D NOP ;wait 4 finish
BTFSC ADCON0,GO_DONE
GOTO WAITA2D
;/*-----Put A2D/PWM value in W and send to ports.
MOVF ADRESH,W ;upper 8 bits-ignor lower 3


RETURN ;DUTY CYCLE IS 25% OF PWM PERIOD



END

Now I plug in the temperature sensor that is also tied to an amplifier to amplify the voltage, when it goes through this program and displays on the eight LEDs on port B it counts very fast. I tried to change the
MOVF ADRESH,W
to see if it was counting the wrong 8 bits, but it did the same thing.
Any Suggestions?
Also any quick suggestions for help with entering an equation like this into assembly
windchill = 35.74+0.6215T-35.75(V^0.16)+0.4275T(V^0.16)

Elizabeth
 

Gayan Soyza

Active Member
Code:
	include <p16F877a.inc>
	LIST p=16F877a
	errorlevel 1,-302 ;to disable MPLAB bank warnings.
	__config _XT_OSC & _PWRTE_ON & _WDT_OFF &_LVP_OFF
;
;Some versions of MPLAB use _LVP_OFF
;This sets all portB pins to output.
;Variables
	cblock 0x20 		;start of general purpose registers
	count
	endc

;/*---------Init Ports

	bsf 	STATUS,RP0
	MOVLW 	B'00000001'
	MOVWF 	TRISA 		;All outputs except RA0.
	MOVLW 	B'00000011'
	movwf 	TRISD
	CLRF 	TRISB 		;RA0 is wiper of 50k pot/Vin
	movlw 	b'11111111'
	movwf 	TRISC 		;PortB is 8 LED output to show

;/*-----Set up A2D parameters

	MOVLW 	B'00001110' 	;Hex value of Vin from pot.
	MOVWF 	ADCON1 		;left justified, RA0 = input
	MOVLW 	B'11010111' 	;prescaler 1:256 tmr0, internal clock
	MOVWF 	OPTION_REG
	BCF 	STATUS,RP0

;/*---------Set up chip parameters

Start 	CALL 	A2D
	MOVWF 	PORTB 		;output Hex value to LEDs



	PC 	clrf count
	BTFSS 	PORTD,0
	bsf 	count,0

	BTFSS 	PORTD,1
	bsf 	count,0

	BTFSS 	count,0
	goto 	Start

	movf 	PORTC,w
	movwf 	PORTB

	goto 	PC


A2D
	MOVLW 	B'01000001' 	;a2d = on, ch0, fosc/8
	MOVWF 	ADCON0

;/*-----Delay 	loop to settle A2D, similar to de-bounce???

mnloop 	btfss 	INTCON,T0IF 	;50us loop delay @ 4Mhz
	goto 	mnloop

;/*-----Stop timer0 interrupt

	BCF 	INTCON,T0IF
	BSF 	ADCON0,GO_DONE 	;start a2d conversion
WAITA2D NOP 			;wait 4 finish
	BTFSC 	ADCON0,GO_DONE
	GOTO 	WAITA2D
;/*-----Put 	A2D/PWM value in W and send to ports.
	MOVF 	ADRESH,W 	;upper 8 bits-ignor lower 3
	RETURN 			;DUTY CYCLE IS 25% OF PWM PERIOD


	END
 

engineergirl27

New Member
Blue could you explain a little more what you did with the humidity sensor? And did you used a completely different port than the other inputs. And with the CCP pins, I am currently using the Port C as the input from the windchill. Should I move those?
 

engineergirl27

New Member
Hey Guys,

I have been programming, and I have quite a bit done, I was wondering if any of you could help with the math. The equations are quite extensive and I am not that familiar with it enough to do these extensive of equations.

Here is what I have got. AND IT WORKS


Code:
        #include <p16F877a.inc>
        LIST p=16F877a
	errorlevel 1,-302	;to disable MPLAB bank warnings.
        __config _XT_OSC & _PWRTE_ON & _WDT_OFF &_LVP_OFF
;
		;Some versions of MPLAB use _LVP_OFF
		;This sets all portB pins to output.
;Variables
 		cblock	0x20			;start of general purpose registers
		COUNT
	    TEMP
		CYC
		endc
;/*---------Init Ports
		bsf     STATUS,RP0
        MOVLW   B'00000001'
		MOVWF   TRISA        ;All outputs except RA0.
		
		MOVLW   B'00000011'
		movwf	TRISE
        CLRF    TRISB			;PortB is 8 LED output to show
		movlw	b'11111111'
        movwf   TRISD	
                    
;/*-----Set up A2D parameters
        MOVLW   B'00001110'     
        MOVWF   ADCON1		
        MOVLW   B'11010111'     
        MOVWF   OPTION_REG
        BCF     STATUS,RP0

;/*---------Set up chip parameters
Start	CALL	A2D
        MOVWF   TEMP
		MOVWF   PORTB		;output Hex value to LEDs

		

PC	
		BTFSC	PORTE,0
		goto    Start
		
        ;TEMP <= 80
	    movf TEMP,w
        addlw d'255'-d'80'          
        skpnc
        Call HeatIndex
        ;TEMP <= 40
        movf TEMP,w
        addlw d'255'-d'40'
        skpc
        Call WindChill
        
        GOTO  Start

A2D     
        MOVLW   B'01000001'     ;a2d = on, ch0, fosc/8
        MOVWF   ADCON0
;/*-----Delay loop to settle A2D, similar to de-bounce???
mnloop  btfss   INTCON,T0IF     ;50us loop delay @ 4Mhz
        goto    mnloop
;/*-----Stop timer0 interrupt
        BCF     INTCON,T0IF
        BSF     ADCON0,GO_DONE  ;start a2d conversion
WAITA2D NOP                     ;wait 4 finish
        BTFSC   ADCON0,GO_DONE
        GOTO    WAITA2D
;/*-----Put A2D W and send to port B.
        MOVF    ADRESH,W        ;upper 8 bits-ignor lower 3
        RETURN

HeatIndex
       
START  MOVLW d'10'
       MOVWF CYC
       
       CLRF  COUNT
L1     BTFSS PORTC,2
       GOTO  L1
       
L2     INCF  COUNT
       BTFSC PORTC,2
       GOTO  L2
       
       DECFSZ CYC
       GOTO  L1
       
       MOVF  COUNT,w
       MOVWF PORTB
       
       
       BTFSS PORTE,0
       
       GOTO  HeatIndex
       
       RETURN
       

WindChill
       	movf	PORTD,w
		movwf	PORTB

        BTFSS PORTE,0
        GOTO  WindChill
		RETURN			
 
	

   END
 
Last edited:

ericgibbs

Well-Known Member
Most Helpful Member
engineergirl27 said:
Hey Guys,

I have been programming, and I have quite a bit done, I was wondering if any of you could help with the math. The equations are quite extensive and I am not that familiar with it enough to do these extensive of equations.

Hi,
Nice job.

Post the 'equations' in their mathematic context so that we can suggest suitable software algorithm's for the program.:)
 

mvs sarma

Well-Known Member
blueroomelectronics said:
R1 & R2 only have one side connected. What sort of humidity sensor are you using?
What language are you going to program it with?

As the switches are found to ground, perhaps R1 to R3 might be pull-up resistors.

@engineergirl27,
please put your combined code for both functions as an ASM file instead of Text. It will be useful to analyze
 

Pommie

Well-Known Member
Most Helpful Member
Engineergirl,

When you post code put
Code:
 before your code and [/co[U][/U]de] after it so that it keeps it's format.

Also, what is the range of T and V.

Mike.
 
Last edited:

engineergirl27

New Member
Thanks for the responses guys

Thanks for responding, I wish I would have checked before I went to bed at 3:30am but that is ok. I hope that this is readable to you guys.

Heat Index = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR - (6.83783x10^-3) T^2 - (5.481717x10^-2) R^2 + (1.22874x10^-3) T^2R + (8.5282x10^-4) TR^2 - (1.99x10^-6) T^2 R^2

Where T= Temp in Farenheit, R= Relative Humidity

Wind Chill = 35.74+0.6215T-35.75(V^0.16)+0.4275T(V^0.16)
where T=Air Temperature(˚F) V=Wind Speed(mph)


I know you guys work in celcius I hope it is ok that it is in Farenheit.

I appreciate the help you have given me already, I have to update the schematic too, because that has changed.
Elizabeth
 
Last edited:

skyhawk

New Member
I would suggest table lookups for the heat index and wind chill. Do the computations on your PC using your favorite programming language then load them into tables in the PIC. For instance, tables of the heat index for each 10% of relative humidity indexed by the temperature. Then do linear interpolation. Similar tables for wind chill using wind speed and temperature.
 

Pommie

Well-Known Member
Most Helpful Member
Those are rather complex formulas to do in assembler. You can either use floating point or fixed point. I suggest fixed point with lookup tables.

Here is a table lookup that will do the V^0.16 for V=0-100
Code:
;GetV16 returns (W^0.16)*256 in word variable Acc
;Acc must be in common area (70-7f) 

GetV16		addlw	low V16Tab		;calculate address in table
		bsf	STATUS,RP1		;bank 2
		movwf	EEADR
		movlw	high V16Tab
		btfsc	STATUS,C
		addlw	1
		movwf	EEADRH
		call	ReadFlash		;will return in bank 0
		return

ReadFlash	bsf	STATUS,RP1		;#2
		bsf	STATUS,RP0		;#3
		bsf	EECON1,EEPGD		;read flash
		bsf	EECON1,RD		;do read
		nop				;required delay
		nop
		bcf	STATUS,RP0		;#2
		movfw	EEDAT			;move into Acc
		movwf	Acc
		movfw	EEDATH
		movwf	Acc+1
		bcf	STATUS,RP1		;#0
		return	


V16Tab		dw	.0,.256,.286,.305,.319,.331,.340,.349
		dw	.357,.363,.370,.375,.380,.385,.390,.394
		dw	.398,.402,.406,.410,.413,.416,.419,.422
		dw	.425,.428,.431,.433,.436,.438,.441,.443
		dw	.445,.447,.450,.452,.454,.456,.458,.460
		dw	.461,.463,.465,.467,.469,.470,.472,.473
		dw	.475,.477,.478,.480,.481,.483,.484,.486
		dw	.487,.488,.490,.491,.492,.494,.495,.496
		dw	.497,.499,.500,.501,.502,.504,.505,.506
		dw	.507,.508,.509,.510,.511,.512,.514,.515
		dw	.516,.517,.518,.519,.520,.521,.522,.523
		dw	.524,.524,.525,.526,.527,.528,.529,.530
		dw	.531,.532,.533,.534,.534

Note that the routine can't return a value like 1.614971 (20^0.16) and so it returns this value multiplied by 256 (413). You can multiply this value by 35.75 to get 14764 and then divide by 256 to get 57. This is within 2% of the full accuracy calculation. If you keep all your terms multiplied by 256 and divide after they are summed you will maintain greater accuracy.

You can produce similar tables for your other terms. Just repeat the GetV16 routine with a different table address. Note that the largest value that can go in a table is 16383 as the flash memory is only 14 bits wide.

For 16 and 32 bit multiplication and addition routines try .

BTW, Skyhawks suggestion of lookup tables with interpolation is another good way to do it.

Mike.
 

skyhawk

New Member
It's good to look at the range of values you need to consider. Try taking a look at this link:

**broken link removed**

If you restrict the data to realistic combinations of temperature and relative humidity, you can see that the range of temperatures that you need to handle is larger for low relative humidity than for high.
 

engineergirl27

New Member
Ok so looking at the website with the tables for heat index and wind chill, would it be possible to do a two dimensional look-up table. I am thinking it would be much easier,than those equations.

Elizabeth
 

Pommie

Well-Known Member
Most Helpful Member
I did something similar to this a while back. I modified it to implement the first equation. Once you have your parameters in Temperature and RH you call GetHeat and it returns the value in variable Acc (2 bytes).
Code:
GetHeat		movfw	Temperature		;get Temperature
		addlw	.35			;table starts at -35
		addlw	.2			;course rounding
		call	Divide5			;table goes up in steps of 5
		movwf	Acc			;each table entry is 24 words
		clrf	Acc+1			;so we need to multiply by 24
		bcf	STATUS,C
		rlf	Acc,F
		rlf	Acc+1,F
		rlf	Acc,F			;*4
		rlf	Acc+1,F
		rlf	Acc,F			;*8
		rlf	Acc+1,F
		movfw	Acc
		movwf	TempWord
		movfw	Acc+1		
		movwf	TempWord+1		;keep a copy of Temperature*8
		rlf	Acc,F			;*16
		rlf	Acc+1,F
		movfw	TempWord
		addwf	Acc,F			;T*16+T*8=T*24
		btfsc	STATUS,C
		incf	Acc+1,F
		movfw	TempWord+1
		addwf	Acc+1,F
		movfw	RH			;get the relative humidity
		addlw	.2			;course rounding
		call	Divide5			;table is in steps of 5
		addwf	Acc,F
		btfsc	STATUS,C
		incf	Acc+1,F
		movfw	Acc
		addlw	low HeatTable		;calculate address in table
		bsf	STATUS,RP1		;bank 2
		movwf	EEADR
		bcf	STATUS,RP1		;bank 0
		movfw	Acc+1
		bsf	STATUS,RP1		;bank 2
		addlw	high HeatTable
		btfsc	STATUS,C
		addlw	1
		movwf	EEADRH
		call	ReadFlash		;will return in bank 0
		return

ReadFlash	bsf	STATUS,RP1		;#2
		bsf	STATUS,RP0		;#3
		bsf	EECON1,EEPGD		;read flash
		bsf	EECON1,RD		;do read
		nop				;required delay
		nop
		bcf	STATUS,RP0		;#2
		movfw	EEDATA			;move into Acc
		bcf	STATUS,RP1		;#0
		movwf	Acc
		bsf	STATUS,RP1		;#2
		movfw	EEDATH
		btfsc	EEDATH,5		;is it negative
		iorlw	b'11000000'		;yes, so sign extend
		bcf	STATUS,RP1		;#0
		movwf	Acc+1
		return	

Divide5		clrf	TempWord		;returns W/5
Div5Loop	incf	TempWord,F
		addlw	100h-5			;add -5
		btfsc	STATUS,C
		goto	Div5Loop		
		decf	TempWord,W
		return

HeatTable
		dw	-.122,-.27,.64,.151,.233,.311,.385,.454,.519,.579,.636,.687,.735,.778,.817,.851,.881,.907,.928,.945,.958,.0,.0,.0
		dw	-.110,-.22,.62,.141,.217,.288,.356,.419,.478,.533,.584,.631,.674,.712,.747,.777,.803,.825,.844,.857,.867,.0,.0,.0
		dw	-.98,-.17,.60,.133,.202,.267,.328,.386,.440,.489,.535,.577,.615,.650,.680,.707,.729,.748,.763,.774,.781,.0,.0,.0
		dw	-.86,-.12,.58,.125,.187,.247,.302,.354,.403,.448,.489,.526,.560,.590,.617,.640,.659,.675,.687,.695,.700,.0,.0,.0
		dw	-.75,-.7,.56,.117,.174,.228,.278,.325,.368,.408,.445,.478,.508,.534,.557,.577,.593,.606,.615,.621,.624,.0,.0,.0
		dw	-.64,-.3,.55,.110,.161,.210,.255,.297,.335,.371,.403,.432,.459,.481,.501,.518,.531,.541,.548,.552,.552,.0,.0,.0
		dw	-.53,.2,.54,.103,.150,.193,.233,.270,.305,.336,.364,.390,.412,.432,.448,.462,.473,.480,.485,.487,.486,.0,.0,.0
		dw	-.42,.7,.54,.97,.139,.177,.213,.245,.276,.303,.328,.350,.369,.385,.399,.410,.418,.424,.427,.427,.424,.0,.0,.0
		dw	-.32,.12,.53,.92,.128,.162,.194,.222,.249,.272,.294,.312,.329,.342,.353,.362,.368,.371,.372,.371,.367,.0,.0,.0
		dw	-.23,.16,.53,.87,.119,.149,.176,.201,.224,.244,.262,.278,.291,.302,.311,.317,.321,.323,.323,.320,.314,.0,.0,.0
		dw	-.13,.21,.53,.83,.111,.136,.160,.181,.201,.218,.233,.246,.257,.266,.272,.277,.279,.279,.277,.273,.267,.0,.0,.0
		dw	-.4,.26,.53,.79,.103,.125,.145,.164,.180,.194,.206,.217,.225,.232,.237,.239,.240,.239,.236,.231,.224,.0,.0,.0
		dw	.5,.30,.54,.76,.97,.115,.132,.147,.161,.172,.182,.191,.197,.202,.205,.206,.206,.203,.199,.194,.186,.0,.0,.0
		dw	.13,.35,.55,.74,.91,.106,.120,.133,.144,.153,.161,.167,.172,.175,.176,.176,.175,.172,.167,.161,.153,.0,.0,.0
		dw	.21,.39,.56,.72,.86,.98,.110,.120,.128,.136,.142,.146,.149,.151,.151,.150,.148,.144,.139,.133,.125,.0,.0,.0
		dw	.29,.44,.57,.70,.81,.92,.101,.109,.115,.121,.125,.128,.130,.130,.130,.128,.125,.121,.116,.109,.102,.0,.0,.0
		dw	.36,.48,.59,.69,.78,.86,.93,.99,.104,.108,.111,.113,.113,.113,.112,.110,.106,.102,.97,.90,.83,.0,.0,.0
		dw	.43,.52,.61,.69,.76,.82,.87,.91,.95,.97,.99,.100,.100,.99,.97,.95,.91,.87,.82,.76,.69,.0,.0,.0
		dw	.50,.57,.63,.69,.74,.78,.82,.85,.87,.89,.90,.90,.89,.88,.86,.84,.80,.76,.72,.66,.60,.0,.0,.0
		dw	.56,.61,.66,.70,.73,.76,.79,.81,.82,.83,.83,.83,.82,.81,.79,.76,.73,.70,.66,.61,.56,.0,.0,.0
		dw	.62,.65,.68,.71,.73,.75,.77,.78,.78,.79,.79,.78,.77,.76,.75,.73,.70,.67,.64,.61,.57,.0,.0,.0
		dw	.68,.70,.71,.73,.74,.75,.76,.77,.77,.77,.77,.77,.76,.75,.74,.72,.71,.69,.67,.65,.62,.0,.0,.0
		dw	.73,.74,.75,.75,.76,.77,.77,.77,.77,.78,.78,.78,.77,.77,.77,.76,.76,.75,.74,.73,.72,.0,.0,.0
		dw	.78,.78,.78,.78,.79,.79,.79,.80,.80,.80,.81,.81,.82,.82,.83,.84,.84,.85,.86,.86,.87,.0,.0,.0
		dw	.82,.82,.82,.82,.82,.82,.83,.84,.84,.85,.86,.88,.89,.91,.93,.95,.97,.99,.102,.104,.107,.0,.0,.0
		dw	.87,.86,.86,.86,.86,.87,.88,.89,.91,.92,.95,.97,.100,.103,.106,.109,.113,.117,.122,.127,.132,.0,.0,.0
		dw	.91,.90,.90,.91,.91,.93,.94,.96,.99,.102,.105,.109,.113,.118,.123,.128,.134,.140,.147,.154,.161,.0,.0,.0
		dw	.94,.94,.95,.96,.97,.100,.102,.106,.109,.114,.118,.124,.129,.136,.143,.150,.158,.167,.176,.185,.195,.0,.0,.0
		dw	.97,.98,.100,.102,.104,.108,.112,.116,.121,.127,.134,.141,.149,.157,.166,.176,.187,.198,.209,.221,.234,.0,.0,.0
		dw	.100,.102,.105,.108,.112,.117,.122,.129,.136,.143,.152,.161,.171,.182,.194,.206,.219,.233,.247,.262,.278,.0,.0,.0
		dw	.103,.106,.110,.115,.121,.127,.134,.143,.152,.162,.173,.184,.197,.210,.224,.239,.255,.272,.289,.308,.327,.0,.0,.0
		dw	.105,.110,.116,.122,.130,.138,.148,.158,.170,.182,.196,.210,.225,.241,.258,.276,.295,.315,.336,.358,.380,.0,.0,.0
		dw	.107,.114,.121,.130,.140,.151,.163,.176,.190,.205,.221,.238,.256,.275,.296,.317,.339,.362,.387,.412,.439,.0,.0,.0
		dw	.108,.117,.128,.139,.151,.165,.179,.195,.212,.230,.249,.269,.291,.313,.337,.361,.387,.414,.442,.471,.502,.0,.0,.0
		dw	.110,.121,.134,.148,.163,.180,.197,.216,.236,.257,.279,.303,.328,.354,.381,.410,.439,.470,.502,.535,.570,.0,.0,.0
		dw	.110,.125,.141,.158,.176,.195,.216,.238,.262,.286,.312,.340,.368,.398,.429,.461,.495,.530,.566,.604,.642,.0,.0,.0

The table runs from -35°F to +140°F in steps of 5° and 0 to 100% RH in steps of 5. Note that I extended the table so each row contains 24 values to simplify the maths.

The table was generated with a little excel sheet that I wrote. I'll attach it. You should be able to generate the other table with it. To use it run the macro called "Convert" and the table data will be placed on the clipboard. I had to zip it as xls files aren't allowed.:rolleyes:

The above code was written for a 16F88 but I'm pretty sure the 876 is the same. It's untested and so you may have to debug it.

Have fun.

Mike.
 
Last edited:

engineergirl27

New Member
Thanks for all your help, I am still extremely confused on the lookup table stuff, I wish that i only had to work on the programming for this. but that is not the case, I am also trying to get the paper and presentation slides done for this project which is due friday. do you guys know of any easier way to calculate wind chill, I have a simpler equation WC = Temp - Wind Speed/4, but this is for Celcius and km/hour, so I would need to the the conversions for that. which might be possibly, might but I don't know if I have enough time in the day to do that.

Elizabeth
 
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