28125 Parallax Inc, 28125 Datasheet - Page 339

• Manufacturer Part Number: 28125
• Description: TEXT ROBOTICS
• Manufacturer: Parallax Inc

Specifications of 28125

• Title: Robotics with the Boe-Bot
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Now, we know how to correct the
the
A Linear Equation in PBASIC
In most programming languages for PCs, this equation could be entered as-is. The
BASIC Stamp is a very tiny processor compared to a PC. Because of this, it takes an
extra step to multiply by a fractional value. You have to use the */ operator (it’s called
the “star-slash” operator). For the
timeLeft
The adjusted value of
timeLeft
Your Turn – Balance Your Photoresistors with m and b
timeRight
√
√
√
√
timeLeft = (timeLeft */ 351) + 7
In Table F-1, label the first
X2.
Label the first
Use these equations and your X1, X2, Y1, and Y2 values to solve for m and b.
timeLeft
m
y
y
, plus 7.
=
=
Why did 1.37 become 351? The way the */ operator works is that you have multiply your
fractional value by 256, and place it to the right of the */ operator. Since 1.37 X 256 =
350.72 ≈ 351, the value 351 goes to the right of the */ operator.
You can find out more about the */ operator in the BASIC Stamp Editor by clicking Help and
selecting Index. Type in */ in the field labeled “Type in keyword to find”. You can also look
up */ in the Binary operators section of the BASIC Stamp Manual.
variable can be done like this:
=
. 1
mx
y (
x (
37
2
2
+
variable in this narrow range of light levels:
(
x
−
−
adjusted
b
+
y
x
7
1
1
)
)
)
and
timeLeft
=
timeRight
. 1
b
37
=
×
y
timeLeft
2
−
mx
after this line of code is executed is 1.37 times the old
entry Y1 and the second
timeLeft
2
timeLeft
timeLeft
+
7
variable so that it reports values similar to
equation, the PBASIC code to adjust the
entry X1 and the second
timeRight
entry Y2.
timeLeft
entry