130-28029 Parallax Inc, 130-28029 Datasheet - Page 196
![KIT PARTS SMART SENSORS](/photos/9/0/90016/mfg_130-28029_sml.jpg)
130-28029
Manufacturer Part Number
130-28029
Description
KIT PARTS SMART SENSORS
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
Specifications of 130-28029
Accessory Type
Education Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp®
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Page 184 · Smart Sensors and Applications
Take a look at Figure 5-9. Notice that six ordered pairs were entered into the Debug
Terminal, but there is only one asterisk, and it corresponds with the last pair that was
entered. That's because the program used here makes the old asterisk disappear by taking
the old x, y coordinates to look up the background character from EEPROM, and then
displaying it with
a
programs.
The program used to create Figure 5-9 combines the
from EepromBackgroundDisplay.bs2 with the asterisk plotting and location tracking
technique from PlotXYGraphRecall.bs2. This combination allows us to redraw the
background character over the old asterisk with this code:
DEBUG
IF (x <> xold) AND (y <> yold) THEN
ENDIF
command with the current x, y coordinates as did our previous example
index = (14 * yOld) + xOld + 1
READ index, character
DEBUG CRSRXY, xOld, yOld, character
DEBUG
. To make the asterisk appear at its new location, it simply uses
DATA
' Check if asterisk moved
' Background character address
' Get background character
' Display background character
-defined background technique
Figure 5-9
Display using EEPROM
Background Refresh
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