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

Generate QR Code in Software Testing the PIC Microcontroller

Testing the PIC Microcontroller
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The PIC Microcontroller This is where we will build the testing circuit for the PICmicro chip we pro grammed The components needed for the circuit were listed in Chap 1; if you purchased the components, you can quickly set up the test circuit If not, the components are listed again at the end of this chapter; you will need the com ponents to build the circuit
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The solderless breadboard
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For those of us who have not dabbled in electronics very much, I want to describe the solderless breadboard (see Fig 61) in detail As the name implies, you can breadboard (assemble and connect) electronic components onto it without solder The breadboard is reusable; you can change, modify, or remove circuitry components from the breadboard at any time This makes it easy to correct any wiring errors The solderless breadboard is an important item for constructing and testing circuits outlined in this book The style of breadboard on the left is available from any number of sources including RadioShack The breadboard on the right is similar but provides a larger prototyping area If you wish to make any circuit permanent, you can transfer the components onto a standard printed circuit board and solder it together with the fore knowledge that the circuit functions properly A partial cutaway of the top surface shows some of the internal structure of a board (Fig 62) The holes on the board are plugs When a wire or pin is inserted into the hole, it makes intimate contact with the metal connector strip inside The holes are properly distanced so that integrated circuits and many other components can be plugged in You connect components on the board by
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Figure 61 Top view of solderless breadboards
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Figure 62 Top view of solderless breadboards with a partial cutaway showing underneath conductive contact strips
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using 22 gauge (solid or stranded) wire I prefer to use stranded wire because it has greater flexibility; other people prefer solid wire because it s stiffer and easier to push into the breadboard hole The complete internal wiring structure of the solderless boards is shown in Fig 63 The solderless breadboard on the left shows the X and Y rows that are typically used to supply power (Vcc) and ground connections to the circuit The columns below the X row and above the Y row are used for mounting compo nents The solderless breadboard on the right has double rows located at the top and bottom These are used to supply both Vcc and ground on each side of the breadboard
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Three schematics, one circuit
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Figures 64, 65, and 66 are identical schematics of our test circuit The 16F84 PIC microcontroller in the schematic is the microcontroller you programmed in either Chap 4 or 5 I drew three schematics to help orient experimenters who may not be familiar with standard electrical drawings Figure 64 shows
Testing the PIC Microcontroller
Figure 63 Top view of solderless breadboards detailing conductive strips
RA2 RA1 RA0 OSC1/CLKIN OSC2/CLKOUT Vdd RB7 RB6 RB5 RB4
RA3 RA4IT0CKI MCLR Vss RB0/INT RB1 RB2 RB3
47k
2 3 4 5 6 7 8
17 16
4MHz 22pF 22pF
15 14 13 12 11 10
PIC16F84
1uF
Xtal Electrical Symbol
Resistor
Capacitor
All resistors 1/4 watt Component Appearance
40 MHz +
Figure 64 Isometric schematic of test circuit for winkbas program
how the PIC 16F84 microcontroller and components appear There is a legend at the bottom that shows the electrical symbol and the typical appearance of the component Figure 65 is a line drawing showing how the components appear mounted on one of the solderless breadboards The writing on Fig 65 points out each electrical component
Six
X 1 A B C D E 5 10 15 20 Xtal 22 pF
PIC16F84
7805 Volt Reg +Vcc Gnd 1uF 470 47k Ground LEDs F G H I J Y 1 5 10 15
+ + Red LED Side View 20 Ground +
Figure 65 Isometric drawing showing test circuit constructed on solderless breadboard
Figure 66 Schematic of test circuit for winkbas program
If you examine the placement of the components mounted on the solderless breadboard with its internal electrical wiring (Figs 62 and 63), you can see how the components connect to one another and produce a circuit Figure 66 is the same schematic drawn as a standard electrical drawing with the pin numbers grouped and oriented to function For the remainder of the book, standard electrical drawings will be used The schematic shows how minimal are the components needed to get your microcontroller up and running Primarily you need a pull up resistor on pin
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