Setting up variables

johntech

I have 5 IR detectors that I am monitoring. I am using a BS2 and using pins 1 - 5 as input pins.
When they are not blocked all the inputs are low (0), when blocked they are high (1)
Right now I am using a ·IF/THEN·tree to see which one(ones)·is (are)·blocked.

I am reading the Basic Stamp Syntax and Reference Manual
I am wondering·how to set a variable ex:

IRBlocked· var nib

then read the 5·inputs as· either 1's or 0's· ex: 00000 - 11111 or any combination between in the group

and then use a select case statement to display which ones are blocked depending on the state of the
5 digits.

So if the first one was blocked IRBlocked would equal "10000"
The last two blocked would equal "00011"

Any help would be appreciated

Thank you

John

Franklin

First, a nib is 4 bits and then look at bit variables ina inb .... that should give you a start

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- Stephen

Tracy Allen

There are 32 cases. Maybe the CASE statement is not what you want. Reading and displaying the inputs is pretty easy:

myIR VAR Byte
DO
  myIR = inL >> 1 & %00011111
  ' that reads the inputs, shifts the result one bit right, and masks off 5 bits.  State of in1 to in5 now in myIR
  DEBUG BIN5 myIR, CR   ' display as 5 binary bits
  NAP 5
LOOP

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Tracy Allen
www.emesystems.com

johntech

Thank you Stephen for your reply.

I guess I need to do some more reading on the ina and inb commands and differences between NIB and the BYTE


Thank you Tracy for the code.

I'll try your code and read up on the commands in your line

····· myIR = inL >>1 & %00011111

If I am looking for a certain state of the IR's· say "11011"
then I can use a simple IF/THEN statement·like

IF myIR = "11011" THEN OUT 10

I'll have to try that and see if it works


Thanks again to both of you

John

Tracy Allen

No, test myIR like this,
IF myIR=%11011 THEN HIGH 10

It only becomes a string for display PBASIC when formated by the BIN5 myIR modifier. PBASIC does not have string operators or string variables.

OUT 10 is not a valid syntax. You can say,
OUTPUT 10 ' makes p10 an output
OUT10=10 ' makes p10 high
or
HIGH 10 ' makes it output and high all at once.

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Tracy Allen
www.emesystems.com

johntech

So you use the byte data format %XXXXX for what ever combination you are looking for.... I see

It's back to the book for more reading

Thank you Tracy

John