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Announcements . Feb 14 - ESPN will be recruiting via video conference. A typical “hardware” standard. How do computers control the world?. Each joint is a motor that can be turned on and off with a switch. 7 switches to control a whole robot. A Computer “port”.

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Announcements
Announcements

  • Feb 14 - ESPN will be recruiting via video conference






A computer port
A Computer “port” switch

  • Connects 1 byte of memory to outside world


A printer port
A printer “Port” switch

  • Computer connects an internal byte variable to the printer switches, and changes the values to tell the printer what to print


Address switch

Data

Memory

r/w


I/0 Memory switch

Data Memory

Program Memory

Fast Specialty Memory


Memory mapped I/O switch

8-bit

Your Program

Driver

Port

A Decimal

Variable

A Binary

Value

A function

call


An example program
an example program switch

Private Sub Write_Port(value As Integer)

txtByteOut.Text = (value) 'decimal

Status = cbUSBDOut(DeviceNum, RELAY_PORT, value)

If value < 16 Then

txtHexOut.Text = "0" & (Hex(value))

Else

txtHexOut.Text = (Hex(value))

End If ' hex

txtBinary.Text = CBin(value) 'binary

End Sub



motor, etc switch


Computer switch

“dirty” Environment



Computer switch

Environment



Buying parts
buying parts switch

http://www.sparkfun.com


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