27220 Parallax Inc, 27220 Datasheet - Page 50

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

EXPERIMENT #5: LED GRAPH (DOT OR BAR)
In Experiment #4 we used a line of LEDs for artistic purposes; this time we’ll turn to
something a bit more technically oriented. The purpose of this experiment is to
create a configurable (dot or bar) LED graph. This type of graph is very common on
audio equipment, specifically for VU (volume) meters. The value for the graph in the
experiment will be taken from the position of a potentiometer.
Look It Up: PBASIC Elements to Know
Building the Circuit
Add the following RC circuit to the LEDs used in Experiment #4.
Note: The 0.1 µF capacitor is marked: 104.
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1. Using black wire (cut as required), connect the Vss (ground) rail to socket
2. Plug a 0.1 µF capacitor (marked 104) into sockets C15 and C16.
3. Using white wire, connect socket A16 to BASIC Stamp P15.
Word (variable type)
Byte (variable type)
GOSUB-RETURN
RCTIME
IF-THEN-ELSE-ENDIF
*/ (star-slash operator)
DCD
A15.