oBumper8 Object
An Object that reads an 8 switch bumper.
Description:
 

A Hardware Object that reads a group of 8 bumper switch inputs and returns a URCP Heading value indicating the direction of the impact.
Operation:
 

The oBumper8 Object uses the 8 I/O lines specified by the IOGroup property to read a group of 8 bumper switches. It converts the data to a URCP Heading value indicating the direction of the impact which is then stored in the Value property.  If any two or four adjacent bumper switches are pressed at the same time, the Value property is adjusted to a URCP Heading indicating that the impart was located between the two center bumper switches and if any three adjacent bumper switches are pressed at the same time, the Value property is adjusted to a URCP Heading indicating that the impact was located at the position of the center switch.  When any one of the 8 bumper switches or two, three or four adjacent bumper switches are pressed, the Received property will be set to 1 and when all 8 bumper switches are not are pressed or two or more non-adjacent switches are pressed, the Received property is cleared to 0. 
Storage size & Availability:
 

The following table lists the size and availability of the oBumper8 Object:

ObjectSizeVersion
oBumper8 4 Bytes B.2.0
Properties:
 

The following table lists the Properties of the oBumper8 Object:

Property Description
Address

Returns a pointer to the address of the oBumper8 Object instance.

Data-Type: Address, Read-Only

Data-Range: 0 - 127
IOGroup

A value that specifies which physical I/O Group to use.

Data-Type: Nibble

Data-Range: 0 - 3
Operate

A value that specifies whether or not the data is updated.

Data-Type: Bit, Flag

Data-Range: 0 - 1
Unsigned

A value that specifies if the Value property is signed or unsigned.

Data-Type: Bit

Data-Range: 0 - 1
Value

A value that indicates the current URCP Heading position that the impact was detected at.

Data-Type: URCP Heading, Byte, Default

Data-Range: when signed: -128 to +127, when unsigned: 0 - 255

I/O InputsBumpersPositionSigned ValueUnsigned ValueReceived3 or 4 adjacent switches pressed
I/O InputsBumpers
00000001 -------x Front 0 0 1 10010001 x-----xx
00010001 ------xx   16 16 1 10010011 x----xxx
00010000 ------x- Front-Left 32 32 1 00010011 -----xxx
00010010 -----xx-   48 48 1 00110011 ----xxxx
00000010 -----x-- Left 64 64 1 00110010 ----xxx-
00100010 ----xx--   80 80 1 00110110 ---xxxx-
00100000 ----x--- Back-Left 96 96 1 00100110 ---xxx--
00100100 ---xx---   112 112 1 01100110 --xxxx--
00000100 ---x---- Back -128 128 1 01100100 --xxx---
01000100 --xx----   -112 114 1 01101100 -xxxx---
01000000 --x----- Back-Right -96 160 1 01001100 -xxx----
01001000 -xx-----   -80 176 1 11001100 xxxx----
00001000 -x------ Right -64 192 1 11001000 xxx-----
10001000 xx------   -48 208 1 11001001 xxx----x
10000000 x------- Front-Right -32 224 1 10001001 xx-----x
10000001 x------x   -16 240 1 10011001 xx----xx
Other   Unchanged 0  
Example:
  In the following example, the oBumper8 Object is used.
' This program reads a 8 switch 
' bumper, displays the URCP 
' heading value on I/O lines 
' 24 - 31 and the Received
' property on I/O line 7.

Dim A As New oBumper8 
Dim B As New oDio8
Dim C As New oDio1

Sub Main()
  OOPic.Pullup = 1
  A.IOGroup = 1
  A.Operate = cvTrue
  B.IOGroup = 3
  B.Direction = cvOutput
  C.IOLine = 7
  C.Direction = cvOutput
  Do
    B.Value = A.Value
    C.Value = A.Received
  Loop
end sub
Connections
  The oBumper8 uses 8 I/O lines.  These 8 I/O lines must be 8 contiguous I/O lines starting with I/O line 8, 16 or 24.  The inputs are active low and each of the 8 I/O lines will require a pull up resister.  If the I/O lines starting with I/O line 8 are selected, the internal pull up resisters can be used by setting the OOPic.PullUp property to 1.

The first set of 4 I/O lines of the 8 are used for the 4 four switches; Front, Left, Back and Right.  The second set of 4 I/O lines of the 8 are used for the 4 four switches; Front-Left, Back-Left, Back-Right & Front-Right.

Switch PositionTypical wiring for each switch
IOGroup:123Switch
Location
I/O 0: 8 16 24 Front
I/O 1: 9 17 25 Left
I/O 2: 10 18 26 Back
I/O 3: 11 19 27 Right
I/O 4: 12 20 28 Front-Left
I/O 5: 13 21 29 Back-Left
I/O 6: 14 22 30 Back-Right
I/O 7: 15 23 31 Front-Right

Caution: IOGroup 2 contains special purpose I/O such as Debugging, Serial Port & PWM. Do not use IOGroup 2 if these other functions are in use.
See Also:
  oBumper4 - An Object that reads a 4 switch bumper.