Twenty: Aurora Monitor Project in Software

Painting EAN13 in Software Twenty: Aurora Monitor Project

Table 20-1

Color Band Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver No color 1st Digit 0 1 2 3 4 5 6 7 8 9 2nd Digit 0 1 2 3 4 5 6 7 8 9 Multiplier 1 10 100 1,000 (K) 10,000 100,000 1,000,000 (M) 10,000,000 100,000,000 1,000,000,000 01 001 5% 10% 20% 1% 2% 3% 4% Tolerance

Table 20-2

This table is designed to provide the value of alphanumeric coded ceramic, mylar and mica capacitors in general They come in many sizes, shapes, values and ratings; many different manufacturers worldwide produce them and not all play by the same rules Most capacitors actually have the numeric values stamped on them; however, some are color coded and some have alphanumeric codes The capacitor s first and second significant number IDs are the first and second values, followed by the multiplier number code, followed by the percentage tolerance letter code Usually the first two digits of the code represent the significant part of the value, while the third digit, called the multiplier, corresponds to the number of zeros to be added to the first two digits

104 k

Multiplier Tolerance 01 F 10%

CSGNetworkCom 6/4/92

Value 15 pF 33 pF 10 pF 15 pF 20 pF 30 pF 33 pF 47 pF 56 pF 68 pF 75 pF 82 pF 91 pF 100 pF 120 pF 130 pF 150 pF 180 pF 220 pF 330 pF 470 pF 560 pF 680 pF 750 pF 820 pF

Type Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic

Value 1,000 pF /001 F 1,500 pF /0015 F 2,000 pF /002 F 2,200 pF /0022 F 4,700 pF /0047 F 5,000 pF /005 F 5,600 pF /0056 F 6,800 pF /0068 F 01 015 02 022 033

Type Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar

Code 102 152 202 222 472 502 562 682 103 203 223 333 473 503 563 683 104 204 224 334 474 564 105 205

101 121 131 151 181 221 331 471 561 681 751 821

047 05 056 068 1 2 22 33 47 56 1 2

1 2 3 4 8 7 6 5

1 2 3 4 8 7 6 5

1 2 3 4 8 7 6 5

1 2 3 4 5 6 7 14 13 12 11 10 9 8

of the capacitor You will find either a plus (+) or minus ( ) marking near one of the leads on the capacitor body Both the sensor head and control/display board utilize silicon diodes Diodes also have polarity, so they must be installed correctly in order for the circuit to work properly Look closely at a diode and you will see either a white or black color band near one end of the diode body The colored band indicates the cathode end of the diode Go ahead and install D1 on the sensor head board The sensor head and the display boards both have integrated circuits on them, so before we begin installing the ICs, take a quick look at the pin-out diagram depicted in Figure 20-5, which will help you orient the integrated circuits Integrated circuits are highly recommended as an insurance against possible circuit failure at some later date It is much easier to simply unplug an IC and place a new one in the socket rather than trying to un-solder a 14 or 16 pin IC from a circuit board Integrated circuit sockets will usually have a notch or cut-out at one end of the plastic IC socket To the immediate left of the notch or cut-out you will see pin one (1) of the socket Pin (1) of U1 is connected to one end of potentiometer R4 The IC package itself will also have a notch or cut-out at the top end of the IC When placing the IC into its respective socket make sure you align pin one (1) of the IC with pin one (1) of the socket The integrated circuits must be inserted into the socket properly aligned or the circuit will not work and may damage the components Go ahead and place U1 into its socket on the sensor head PC board

core 1 2 in diameter and 10 (The iron core concentrates the flux lines by offering a lower reluctance path than air) Wind the fine insulated magnet wire carefully on the iron core to avoid kinks and breakage Tape the ends of the winding temporarily to the core and carefully solder hook-up wire at each end to form permanent terminals The terminals can be secured to the core with room-temperature vulcanizing (RTV) adhesive to relieve any strains that might develop in the fine magnet wire In the prototype, the sensing circuit board, coil, and battery pack, consisting of two C cells were housed in a case made from standard diameter PVC water pipe cut to a length that will accommodate all of those elements as shown in Figures 20-6 The covers for the sensing head housing are PCV end-caps that press-fit over the 23 8 outside diameter of the pipe The upper cap is a simple cup, but the lower cap is a sleeve with a threaded insert at its end Drill a hole in the square base of the threaded insert for jack J1 and fasten it with a ring nut Then close the cover on the empty pipe and drill two pilot holes 180 apart in the sleeve for self-tapping screws to clamp the cap in position after the sensor head is assembled Cut about a 6 length of RG-174/U coaxial cable, strip both ends and solder the inner conductor of one end to the jack terminal and its shield to the jack lug Solder the inner conductor and shield of the other end to the sensor circuit board Attach the coil to the sensor circuit board with about a 6 length of RG-174/U coaxial cable as shown Connect the inner conductor to one terminal and the shield to the other and solder both in position The prototype includes a twin C cell holder that, with cells in position, has a maximum width dimension of