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lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 08:27am 13 Aug 2016

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I'm trying to measure Battery voltage
I'm using a voltage divider with PIN 24 measuring the voltage

IF I "PRINT "The Voltage is" PIN(24)" V" THIS WORKS FINE
BUT
I need to multiply the voltage by 2 to get the correct battery voltage

IF I do this
voltage = PIN(24)
voltage = PIN(24) * 2

Print voltage""

the program crashes totally

IF I try Print "Voltage";Str$(voltage,3,2); " V"

It still crashes totally
I've also tried
voltage1 = PIN(24)
voltage = voltage1 * 2

and
voltage1$ = PIN(24)
voltage$ = voltage1$ * 2

Nothing works

what am I doing wrong?
I know it's something really stupid and simple but I just cannot get my head round what it is

I did know this, but if I leave something for a couple of weeks I totally forget and I have to learn from scratch again, it's really annoying and frustrating to me, so it must be pi***ng some of you off me asking so many stupid questions that anyone with a memory that works would remember after learning it.Edited by lew247 2016-08-14

lew247

Guru

Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 10:26am 13 Aug 2016

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Sorted it

For some reason this works
[code]SUB BATTERY
Batt2 = Pin(24)
Batt3 = Batt2 * 2
BATT = Batt3
END SUB
[/code]

And then PRINT BATT or PRINT "Battery Voltage";STR$(BATT,3,2);" V" both work

Out of curiousity (if anyone knows) BATT,3,2 what is the 3?
I know the 2 is the number of decimal points to print but not sure what the 3 is

MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139

Posted: 11:52am 13 Aug 2016

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Page 75 of the Micromite manual.

The first number is the amount of characters before the decimal point, and the second number is, as you know, the number of decimal points.

The spaces have been changed to the "^" character as the forum removes the spaces when I post it.

Quote STR$(123.456) will return "123.456"
STR$(123.456, 6) will return "^^^123.456"
STR$(-123.456, 6) will return "^^-123.456"
STR$(-123.456, 6, 5) will return "^^-123.45600"
STR$(53, 6) will return "^^^^53"
STR$(53, 6, 2) will return "^^^^53.00"
STR$(53, 6, 2, "*") will return "****53.00"

MMWombatEdited by MM_Wombat 2016-08-14

Keep plugging away, it is fun learning
But can be expensive (if you keep blowing things up).

Maximite, ColourMaximite, MM+

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