AMICUS18-COMPANION-SHIELD AMICUS, AMICUS18-COMPANION-SHIELD Datasheet - Page 23

• Manufacturer Part Number: AMICUS18-COMPANION-SHIELD
• Description: Amicus18 Companion Shield
• Manufacturer: AMICUS

Specifications of AMICUS18-COMPANION-SHIELD

• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Features: USB Interface, In Circuit Serial Programming Interface
• Kit Contents: Board
• Silicon Family Name: PIC
• Silicon Core Number: PIC18F25K20
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: PIC18F25K20 Microcontroller

The circuit for the pulled-up switch input is shown below:
Open the Amicus IDE and type in the following program, or copy and paste from here:
' Demonstrate a switch input using a pull-up resistor
' Display state of the input pin RB4 when a push-button switch is operated
'
Click the toolbar icon
Amicus18’s microcontroller.
Open the Serial Terminal by clicking on the toolbar, and open a connection to the Amicus18. Use the
default baud of 9600. The serial terminal’s window should show the text “Button = 1”. This is dis-
playing the state of the pin where the button is attached. Press the button and the test will change to
“Button = 0”:
Crownhill AssociatesLimited 2009 - All Rights Reserved
Symbol Switch = RB4
Input Switch
While 1 = 1
Wend
HRSOut
DelayMS 500
"Button =
Compile and Program
Amicus18 Companion Shield
Version 1.0
", Bin1 Switch, 13
Button Released
Button Pressed
PortB
Power
GND
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0
' Button is connected to RB4 (PortB.4)
' Make the button pin an input
' Create an infinite loop
' Delay for half a second
' Do it forever
or press F10 to build the code and place it into the
Button
22K
Push
LED
47
Ω
Ω
22
Resistor
Pull-Up
' Display the input state
Power
Vin
GND
GND
5V
3V3
Rst
06-10-2009