28123 Parallax Inc, 28123 Datasheet - Page 66

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Building and Testing the Second LED Circuit
In Activity #1, you manually tested the first LED circuit to make sure it worked before
connecting it to the BASIC Stamp. Before connecting the second LED circuit to the
BASIC Stamp, it’s important to test it too.
P14
√
√
√
√
√
√
Disconnect power from your Board of Education or HomeWork Board.
Construct the second LED circuit as shown in Figure 2-13.
Reconnect power to your Board of Education or HomeWork Board.
Did the LED circuit you just added turn on? If yes, then continue. If no,
Activity #1 has some trouble-shooting suggestions that you can repeat for this
circuit.
Disconnect power to your Board of Education or HomeWork Board.
Modify the second LED circuit you just tested by connecting the LED circuit’s
resistor lead (input) to P15 as shown in Figure 2-14.
470
Ω
Vss
LED
470
Ω
Vdd
Vss
LED
P15
P14
P13
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
X2
X3
Vdd
Vin
+
+
Vss
Figure 2-13
Manual Test
Circuit for
Second LED