barcode scanner asp.net c# Infrared Input from a TV Remote Control in Software

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Infrared Input from a TV Remote Control
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LISTING 8-3 ' =============================== SerinFromIRbas =============================== ' Program runs on a 20X2 & receives data from IR peripheral ' =============================================================================== ' === Constants symbol abit symbol fromIR symbol toIR === = 500 = C2 = C5
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' used in pauses ' input pin specification ' output pin specification
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' === Variables === symbol IRflag = pinC2 symbol key = b0 ' === Directives === #com 3 #picaxe 20X2 #no_data #no_table #terminal 9600
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' value of input pin variable ' value of key-press
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' ============================= Begin Main Program ============================= do pause 100 ' pretend to be busy if IRflag = 1 then gosub getData loop ' =================== End Main Program - Subroutines Follow =================== getData: pulsout toIR,5 ' 50uS "send it" pulse serin fromIR,N2400_8,key ' get value of key-press sertxd (#key,cr,lf) ' send value to Terminal return
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or serial input) and doesn t respond to the download request Whenever this happens, just turn the power off, restart the download, and turn the power back on the download should proceed normally Keeping all that in mind, download TVIRtoMPbas to the 08M2 and SerinFromIRbas to the 20X2 A button-press on the TV remote should produce the corresponding IR code in the terminal window If it doesn t, you may want to add debugging LEDs to troubleshoot your setup
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Project 8
Constructing the TV-IR Input Module
Now that we have a fully functional design, we re ready to convert our IR input circuit to a selfcontained peripheral module As usual, we ll use a small stripboard circuit; the schematic is presented in Figure 8-5 As you can see, it s similar to the breadboard circuit we just tested, with one important exception the serin pin is directly tied
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to Ground In the breadboard circuit, the serin pin was tied to Ground by the circuitry in the programming adapter We won t be programming the 08M2 when it s inserted in the socket because we have already downloaded and tested the program in the breadboard circuit When the stripboard is completed, we ll simply remove the 08M2 from the breadboard and insert it into the stripboard socket Therefore, we can tie serin directly to Ground in order to allow the program to run The only downside is that we won t be able to program the 08M2 when it s in the stripboard circuit, but that doesn t really matter because there s no need to change the program If you think of a great new feature you would like to add to the program, all you have to do is temporarily move the 08M2 to a breadboard circuit to reprogram it and then back to the stripboard to actually run it
PA R TS B I N
ID Part Small piece of stripboard, 5 traces with 6 holes each 08M2 08M2 4602 LED H1 H2 DIP socket, 8-pin (machined pins) PICAXE-08M2 (or 08M) processor PNA4602M IR detector LED, 3 mm, resistorized Header, female, 3-pin section Header, male, reverse-mountable, 5-pin section
Constructing the TV-IR Remote Input Module
Constructing the TV-IR input module is straightforward The parts list is shown in the Parts Bin and the stripboard layout is presented in Figure 8-6
Three aspects of the layout require clarification First, the machined-pin socket is required because the jumper from D1 to D5 is on the top of the board so some space is needed underneath the socket Second, the combination of X and a dark center at B5 are intended to indicate that the header pin should be soldered at this point and then snipped off If you prefer, you could use a four-pin male header instead and leave hole B5 empty Either way, there should not be a pin at this
Figure 8-5
Schematic for the TV-IR input module
8
Infrared Input from a TV Remote Control
Figure 8-6
Stripboard layout for TV-IR remote input module
location Finally, the female header that s used for connecting the PNA4602M is included in the circuit because we re going to be using the TV-IR module again when we get to Part Three At that time, we ll need to bend the 4602 s pins at a right angle I included the female header so that it would be possible to use two different 4602s (one with straight pins and the other with bent pins), rather than rebending the pins every time we needed a different orientation for the 4602 it certainly wouldn t last very long that way As usual, read through the complete list of assembly instructions that follows to be sure you understand the entire procedure before assembling the board
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