barcode scanner vb.net textbox Select Case Value Case 16706 Tx = "0" MotorVal = 5 Case 16898 Tx = "1" MotorVal = 1 .... in Software

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Select Case Value Case 16706 Tx = "0" MotorVal = 5 Case 16898 Tx = "1" MotorVal = 1 ....
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The value 16706 represents the 0 button. When it s pressed, the program stores the string 0 (for display in the debug window) as well as the motor value, 5. Five is used as stop, with both motors turning off (the numeric keypad on the remote forms a control diamond). The program interprets the value 16898 received from the remote as a 1 and sets the MotorVal to 1. The pattern for this value calls for the robot to turn left by turning off its right motor and turning on its left. Review SharpRemote.Bas for other variations, which are self-explanatory. You will note that several of the buttons on the remote are not implemented and set the MotorVal to 5, or stop. You can add your own functionality to these buttons as you see fit. For example, pressing the Volume Up/Down or Channel Up/Down buttons could control the arm on your robot, if it s so equipped.
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Now that you have the remote control system working and you re done testing, it s time to play! Disconnect the BX-24 chip from its programming cable, set your robot on the ground, and apply all power. In the beginning, the robot should not move. Point the remote control at the infrared receiver-demodulator, and press the 2 button (forward). The robot should move forward. Press 5 to stop. Press other buttons to test out the other features.
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Perhaps the BX-24 is not your microcontroller of choice. Or maybe you don t want to use the signal patterns for Sharp TVs and VCRs. You can adapt the receiver-demodulator inter-
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face and the SharpRemote.Bas program for use with a wide variety of controllers, computers, and signal pattern formats. Of course, you ll need to revise the program as necessary, and determine the proper bit patterns to use. You will probably find that the signal patterns used with a great many kinds of remote controls will be usable with the SharpRemote.Bas program. You merely need to test the remote, using the RemoteTest.Bas variation to determine the values to use for each button press. The program still works even if the signal from the remote contains more data bits than the 16 provided. For this application, it doesn t really matter that the last couple of bits are missing we re not trying to control a TV or VCR but our own robot, and the code values for its control are up to us. The only requirement is that each button on the remote must produce a unique value. Things won t work if pressing 2 and 5 yield the same value.
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Remote control devices, like those detailed in the previous section, typically use a special function integrated circuit called an encoder to generate unique sequences of digital pulses that can then be used to modulate an infrared light beam or radio signal. A matching decoder, on the receiving end, translates the digital pulses back into the original format. For example, pressing the number 5 on the remote control might emit a sequence of 1s and 0s like this:
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0111000100010111
The decoder receives this sequence and outputs a 5. In the previous section you used a BasicX-24 microcontroller as a kind of generic decoder for translating signals from a universal remote control. Another, less expensive, alternative is to use an encoder/decoder IC pair, which are available from a number of manufacturers such as National Semiconductor, Motorola, and Holtek. In this section, we ll examine a system that uses the popular Holtek HT-12E and HT-12D four-bit encoder/decoder. The HT-12 chips are available from a number of sources you can also substitute most any encoder/decoder pair you wish to use. Most require minimal external parts and cost under $3 each, so you should feel free to experiment. Fig. 34.5 shows the pinout diagram for the HT-12E encoder. Consult the data sheet for this chip (available at www.holtek.com, Web site for the maker of the chip) for a variety of circuit suggestions. The HT chips support up to 256 different addresses. To receive valid data, you must set the same address on both the encoder and the decoder. The data input is four bits (nibble), which you can connect to individual push-button switches. You can press multiple switches at a time for up to 16 different data values. The output of the HT-12E gates an astable multivibrator circuit that oscillates at approximately 40 kHz. I have specified the use of two high-output infrared LEDs. The higher the output, the longer the range of your remote control system.
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