how to generate and scan barcode in asp.net using c# Testing the PIC Microcontroller in Software

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Testing the PIC Microcontroller
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Figure 67 Photograph of winkbas circuit constructed on solderless breadboard
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4 (MCLR), a 4 MHz crystal with two (22 pF) capacitors and a 5 V power sup ply Note: The 4 MHz crystal and two (22 pF) capacitors make up an oscillator that is required by the microcontroller These three parts may be substituted with a 4 MHz ceramic resonator The two LEDs and the two resistors connected in series with each LED are the output It allows us to see that the microcontroller and program are func tioning properly Assemble the components as shown in the schematic (Fig 65) onto the sol derless breadboard When you have finished, your work should appear as in Fig 67 Although the specifications sheet on the 16F84 states the microcontroller will operate on voltages from 2 to 6 V, I provided a regulated 5 V power supply for the circuit The regulated power supply consists of a 7805 voltage regula tor and two filter capacitors
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Apply power to the circuit The LEDs connected to the chip will alternately turn on and off Wink, , wink Now you know how easy it is to program these microcontrollers and get them up and running
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Troubleshooting the circuit
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There is not too much that can go wrong here If the LEDs do not light, the first thing to check is the orientation of the LEDs If they are put in backward, they will not light Next check your ground wires See the jumper wires on the right hand side of the solderless breadboard They bring the ground up to the two 22 pF capac itors Check all your connections Look back at Figs 62 and 63 to see how the underlying conductive strips relate to the push in terminals on top of the board PIC Experimenter s Board and LCD Display There are two optional tools you may want if you plan on experimenting with the PIC16F84 and microcontrollers in general They are the PIC Experimenter s Board and LCD display We will look at the LCD display first because a similar LCD display is incorporated into the PIC Experimenter s Board and what we say about the stand alone LCD display is also true for the PIC Experimenter s Board LCD display One thing PIC microcontrollers lack is some type of display With a display, the chip could show us how a program is running or what it is detecting In addition a display would allow the microcontroller to output textual and numeric messages to the user To this end there are serial LCD displays on the market that only require a single microcontroller s I/O lines (pin) and a circuit ground The particular LCD display we are using receives standard serial data (RS 232) at 300, 1200, 2400, and 9600 baud (Bd) (inverted or true) The LCD module is a two line, 16 character visible display The full display is actually two lines by 40 characters, but the additional 24 characters per line are off screen We can use the PicBasic and PicBasic Pro serout command to communicate and output mes sages to the LCD display The PicBasic and PicBasic Pro compilers can send and receive serial information at 300, 1200, 2400, and 9600 Bd Data are sent as 8 bits, no parity, and 1 stop bit The serial mode may be set to be true or inverted These data match the serial communication protocols required of the LCD display The LCD module has three wires: 5 V (red), GND (black or brown), and a serial in line (white) The baud rate may be set to 300, 1200, 2400, or 9600 by using a set of jumpers (J1, J2, and J3) on the back of the LCD display This first program prints the message Hello World The cursor (printing position) automatically moves from left to right The schematic is shown in Fig 68, and the LCD display is shown in Fig 69
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