28029 Parallax Inc, 28029 Datasheet - Page 18

• Manufacturer Part Number: 28029
• Description: KIT PARTS SMART SENSORS W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28029

• Accessory Type: Parts Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® or Javelin Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 28029PAR

Page 6 · Smart Sensors and Applications
Testing the Serial LCD
The Parallax Serial LCD has a self-test mode you can use to make sure it's in working
order and that the contrast is properly set. Figure 1-5 shows the back of the LCD module.
The switches labeled (SW1 and SW2) are for self-test mode and baud rate adjustment,
and there is a contrast adjustment potentiometer labeled “INCREASE CONTRAST.”
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The power to your board should still be off.
Find SW1 and SW2 on the underside of the LCD module shown in Figure 1-6 .
Set SW1 off.
Set SW2 off.
Turn the power back on now.
When you turn the power back on, the LCD should display the text "Parallax,
Inc." on the top line (Line 0) and "www.parallax.com" on the bottom line
(Line 1), as you can also see in Figure 1-3. If you leave the LCD in this mode
for a while, a custom character reminiscent of 1980's video games will appear
and eat all the text.
Figure 1-6
Setting Baud Rate
Switches to Self-
test Mode
Figure 1-5
LCD Module -
Back View