28128 Parallax Inc, 28128 Datasheet - Page 30

• Manufacturer Part Number: 28128
• Description: KIT BASIC ANALOG/DIGI PARTS ONLY
• Manufacturer: Parallax Inc

Specifications of 28128

• Accessory Type: ADC, DAC
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(misc.) Jumper wires
The Pushbutton
There's just one new part and circuit symbol to introduce for this experiment, the
pushbutton in Figure 2-1. Note how each terminal on the circuit symbol corresponds to
two pins on the part. If you want to connect to a particular terminal shown on the symbol,
you can connect to either (or both) of the two corresponding pins on the part.
The open space in the circuit symbol indicates that the switch is normally open. When the
two terminals of a switch are not connected, the switch is referred to as an open circuit.
Under normal circumstances (when the pushbutton is not pressed), the circuit is open,
thus the name normally open.
Building the Circuit
Figure 2-2 shows the schematic for this experiment. Remember to think of a schematic as
a list of components and connections. For example, the anode of the right LED is
connected to the P5 terminal on the Board of Education. The cathode is connected to one
terminal of a 470
terminal on the Board of Education, and so on. Follow schematics faithfully when
constructing circuits.
resistor. The other pin on that same resistor is connected to the Vss
Figure 2-1
Pushbutton Circuit
Symbol Compared to
the Component