Displaying pH readings in a PINK HTML page

foodgod

I'm currently working on a project where I'm reading pH readings from a water reservoir into a propeller. As the pH value goes outside a set pH range, solenoid valves release an acidic or alkaline liquid concentrate depending on the current pH value. I'm trying to display the current pH value in an HTML page using PINK but I'm not sure if it's possible. Does anyone know if variables can be displayed this way? If so how would this be achieved? Thank you!

Chris Savage

Hello,

Any variable up to 64 characters long can be displayed in a web page. Please see the PINK documentation for more details. While many of the examples are for the BASIC Stamps, the web server functions are identical regardless of the connected microcontroller.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Chris Savage
Parallax Engineering

foodgod

Chris, thanks for the explanation. I'm still having difficulty trying to to display an integer value in PINK. Below is the code I'm using to understand PINK. In the repeat section of this code, I've placed a Pink.write function which initially displayed a string from DAT. what I'm attempting to do is display the integer stored in the status variable. I've tried many different methods of doing this to no avail. What I see displayed is garbage. I think the problem is the format but I'm not sure. What would the proper format be to display the status variable properly?Do I need to convert the status variable to a string? The examples I find on line show only strings being displayed. I'm only using this code for testing purposes so the variable, status, is just a test variable. I'd eventually like to display a variable into the HTML page which comes from voltage readings of an A/D converter. Any help would be greatly appreciated. Thanks

CON

_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000

Pin_PinkTX = 6 'tx pink
Pin_PinkRX = 7 'rx pink


VAR

byte buffer[noparse][[/noparse]64]
OBJ
Pink : "PinkV2"
term : "tv_text"
delay : "clock"
PUB Start | status,read
term.start(12)

' Initialize Pink (uses 1 cog)

Pink.PinkV2("0", Pin_PinkRX, Pin_PinkTX) 'Pink Baud 9600
DELAY.PauseSec(3)
Pink.writeVar(Pink#Nb_var01,@WriteTest)
DELAY.PauseSec(3)
repeat
status := Pink.getStatus
{{____________________________________________________}}
Pink.writeVar(Pink#Nb_var01,@status) {{This is where I'm trying to write the variable, status, to PINK}}
{{____________________________________________________}}
term.dec(status)

term.out(13)
read := Pink.readVar(Pink#Nb_var01, @buffer)
term.str(@buffer)
DELAY.PauseSec(3)
DAT

WriteTest BYTE "Welcome to Pink",13,0

Chris Savage

Okay, I just realized you’re using an object for the PINK I have not yet looked at.· But before you were trying to display pH values and it seems you're trying to use the status value?· That will actually be the status of the flag bits.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Chris Savage
Parallax Engineering

Peter Verkaik

You can write up to 63 non-zero bytes to a pink variable.
(If you write 64 or more non-zero bytes, adjacent pink variables
will be overwritten).
The statusbyte returned by pink is a binary value.
When you try to write the statusbyte to a pink variable,
it will write bytes starting from @status until·it encounters
a binary 0. So this is pointless.
First convert the statusbyte to an asciiz string, then write
the asciiz string to the pink variable.

regards peter
·

foodgod

Initially I was trying to read pH value but I figure I should start at a more basic level. I was using the status register more as an example plus it happened to be a variable already available in the program.I just wasn't understanding the means by which to display a variable that was anything other than a string. I'll trying converting the variable to an ASCII string and then to a PINK variable as suggested. If I'm able to get this to work then I'll try it with the pH value. Thanks for the help.

foodgod

Peter (or anyone who may have a solution),
I took your suggestion and was able to display the pH readings in an HTML page. After doing so, I was next confronted with the problem of displaying the pH value in decimal form. I am currently able to display the decimal value in the Debug terminal but when I assign this value to the value being displayed in the HTML page, the value shows up as only 0 or 255, no intermediate values. My question regarding this is: How can I display the decimal value in the HTML page? Below is the code I'm working with. The byte size variable, buffer_2 is being assigned the result from the function "DisplayValue" which displays the decimal valued pH reading. If I remove the assignment operator,buffer_2 :=, the Debug terminal displays correctly but I can't seem to assign this changing value to a variable. Any suggestions?

Thank you.

pub Start| data

'Initialization section
Initialize

Pink.PinkV2("0", Pin_PinkRX, Pin_PinkTX)

DELAY.PauseSec(3)
repeat

data := AcquireValue
value:= AcquireValue ' Assign current A/D readings to byte value

{{Code below is attempt to display decimal value}}

buffer_2:= DisplayValue(AcquireValue,2,2) 'This is used to display pH in decimal notation
{{fmt.sprintf(@buffer,string("value is %03.3d "),buffer_2)}}

fmt.sprintf(@buffer,string("Current pH: %03.3d "),value)



Pink.writeVar(Pink#Nb_var01,@buffer)

Pink.readVar(Pink#Nb_var01,@buffer)

pH_Adjustment(data) 'If pH is outside set parameters activate 'solenoid valves

DELAY.PauseSec(1) ' 1 second wait