28122 Parallax Inc, 28122 Datasheet - Page 82

• Manufacturer Part Number: 28122
• Description: KIT WHAT'S A MICRO:PARTS ONLY
• Manufacturer: Parallax Inc

Specifications of 28122

• Accessory Type: Parts Kit
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• For Use With/related Products: Board of Education Full Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Testing the Pushbutton
When the pushbutton is not pressed, the LED will be off. If the wiring is correct, when
the pushbutton is pressed, the LED should be on (emitting light).
1, 4
2, 3
√
√
Vdd
Vss
Build the circuit shown in Figure 3-3.
Verify that the LED in your test circuit is off.
Always disconnect power from your Board of Education or BASIC Stamp HomeWork
Board before making any changes to your test circuit. From here onward, the instructions
will no longer say “Disconnect power…” between each circuit modification. It is up to you to
remember to do this.
Always reconnect power to your Board of Education or BASIC Stamp HomeWork Board
before downloading a program to the BASIC Stamp.
Warning signs: If the Pwr LED on the Board of Education flickers, goes dim, or goes out
completely when you plug the power supply back in, it means you have a short circuit. If
this happens to you, disconnect power immediately and find and correct the mistake in your
circuit.
The Power LED on the HomeWork Board is different. It glows only while a program is
running. If a program ends (using the
470
LED
Ω
P15
P14
P13
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
X2
X3
Vdd
END
Vin
command), the Power LED will also turn off.
Vss
+
Figure 3-3
Pushbutton Test Circuit