barcode scanner vb.net textbox INTERFACING THE RECEIVER-DEMODULATOR in Software

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INTERFACING THE RECEIVER-DEMODULATOR
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The first order of business is to interface the receiver-demodulator to the BX-24 chip. Most any receiver module for 38 42 kHz infrared operation should work well. I ve speced out the Sharp GP1U57X because it s widely available, including at Radio Shack. You can also use units from LiteOn, Sony, Everlight, and others. (Hint: one good source for infrared receiver-demodulator units is salvaged VCRs. Carefully unsolder it from the circuit board in the VCR and use it in your robot remote control project.) Fig. 34.4 shows the interface for the infrared receiver-demodulator. Note the electrolytic capacitor and pull-up resistor. These are required for proper operation. You ll find the circuit will work better if you solder the ground lead to the metal case of the receiverdemodulator (if it is so equipped). Keep lead lengths short.
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PROGRAMMING THE BX-24
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Listing 34.2 shows the demonstration program to be used with the BX-24 microcontroller. Please refer to 32, Using the BasicX Microcontroller, for more information on how to use the BX-24, including how to compile, download, and execute programs. For now, I ll assume you re familiar with all these things and cut right to the chase. To use the program, be sure to set your universal remote control to output Sharp TV infrared codes. The remote control will come with an instruction booklet on how to select the proper code setting. Look under the TV listing for Sharp and note which code number(s) to use. You may need to try several of them before you will have positive results. For reference, I used a General Electric Universal Remote, model RM94905, and selected Sharp TV code 112. Important! To use this program you ll need to also include the SerialPort.Bas file as part of the project. This file comes with the BX-24 sample files, which are included with the Developer s Kit and are available for free download from the BasicX Web site (www.basicx.com/).
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COMMANDING A ROBOT WITH INFRARED REMOTE CONTROL 545
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FIGURE 34.4 The infrared receiverdemodulator requires relatively few external components to interface to the rest of the circuitry.
LISTING 34.2 SHARPREMOTE.BAS.
Option Explicit Private Const MaxPulses As Integer = 32 Private PulseTrain(1 To MaxPulses) As New UnsignedInteger Private Const OverflowValue As Long = 65535 ' Sub Main() Dim I As Integer, Digit As Byte, Success As Boolean Dim BitValue As Integer, Value As Integer, Tx As String Dim Motors(1 to 9) as Byte, MotorVal As Byte ' define motor patterns 'DLDR format Motors(1) = bx00000100 Motors(2) = bx00000101 Motors(3) = bx00000001 Motors(4) = bx00001101 Motors(5) = bx00000000 Motors(6) = bx00000111 Motors(7) = bx00001100 Motors(8) = bx00001111 Motors(9) = bx00000011 Register.DDRA = bx00001111 Call Initialize MotorVal = 5 Register.PORTA = (Register.PORTA AND bx11110000) OR Motors(CInt(MotorVal)) Do ' Record IR pulses on the input capture pin (pin 12 on BX-12) Call InputCapture(PulseTrain, MaxPulses, 0) I = 2 Digit = 1 Value = 0 Do Call TranslateSpace(PulseTrain(I), BitValue, Success) If (Success) Then Value = Value * 2 ' Right shift Value = Value + BitValue ' Add LSBit Else GoTo Continue
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' PortA direction; ' high nibble=input, low nibble=output
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End If I = I + 2 ' Do even number elements only; ' spaces are in odd number elements
Digit = Digit + 1 Loop While I <= (MaxPulses - 1) Determine item selected Tx is for debug window display MotorVal is the value to use on PortA Select Case Value Case 16706 Tx = "0" MotorVal = 0 Case 16898 Tx = "1" MotorVal = 1 Case 16642 Tx = "2" MotorVal = 2 Case 17154 Tx = "3" MotorVal = 3 Case 16514 Tx = "4" MotorVal = 4 Case 17026 Tx = "5" MotorVal = 5 Case 16770 Tx = "6" MotorVal = 6 Case 17282 Tx = "7" MotorVal = 7 Case 16450 Tx = "8" MotorVal = 8 Case 16962 Tx = "9" MotorVal = 9 Case 16802 Tx = "Power" MotorVal = 0 Case 16930 Tx = "Channel Up" MotorVal = 0 Case 16674 Tx = "Channel Down MotorVal = 0 Case 16546 Tx = "Volume Up" MotorVal = 0 Case 17058 Tx = "Volume Down" MotorVal = 0 Case Else Tx = "[other]" End Select ' Set PortA output to motor value (lower four bits only) Register.PORTA = (Register.PORTA AND bx11110000) OR _ Motors(CInt(MotorVal)) Call PutStr (Tx) ' display on debug window
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