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Figure 19-1 Typical seven-segment displays
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Figure 19-2 Pin assignment for a common anode seven-segment display (face view, as seen from above). These are the pins as assigned on the 16-pin device.
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illuminations than others (if a segment is smaller it needs less current for the same brightness), each illumination in this particular program sequence addresses all eight segments identically so that the time taken will be the same for each segment displayed. In the program we are using, the segments are connected to the Propeller as shown in Figure 19-3. The actual layout that we used is shown in Figure 19-4. using same pins as the LCD uses.
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note These are the pin connections to the Propeller,
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Figure 19-3 Actual segment connections to the Propeller
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Figure 19-4 Positioning the seven-segment display on the bread board
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Program 19-1 Displaying All the Segments on One Display, One after the Other, Rapidly So That They Look Like They Are All on Simultaneously
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{{28 Sep 09 Harprit Sandhu 7SegDisplay.spin Propeller Tool Ver 1.2.6 19 Program 1 Program controls the segments on one 7 segment display Pot is used to change the delay time Place Segment Display on perf board as shown in Pictures. }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ =5_000_000 VAR long stack1[35] word delay byte index OBJ UTIL : "Utilities"
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'The system clock spec '10 MHz 'these are the variables we will use. 'space for 7 Seg driver 'duration for each number 'numbering index 'These are the methods we will need 'for general methods (continued)
seven-segmenT disPLays: disPLaying nUmBers WiTh seven-segmenT Led disPLays
Program 19-1 Displaying All the Segments on One Display, One after the Other, Rapidly So That They Look Like They Are All on Simultaneously (continued)
PUB Go 'main Cog Cognew(SevSeg,@Stack1) 'start new Cog for Segments driver repeat 'this main Cog's main loop delay:=util.read3202_0/16 PRI SevSeg ' dira[8..15]~~ index:=0 repeat index+=1 'index:=8 'use this line to freeze index at 8 to see all segs lit 1: repeat delay outa[8..15]:=%01_111_111 'These numbers build outa[8..15]:=%11_111_111 'up the numbers shown outa[8..15]:=%11_011_111 'a segment at a time. outa[8..15]:=%11_111_111 'One number at a time. outa[8..15]:=%11_111_111 'a ZERO turns a segment on outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_110 2: repeat delay outa[8..15]:=%11_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_011_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_110 3: repeat delay outa[8..15]:=%11_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_110 (continued)
seven-segmenT disPLays: disPLaying nUmBers WiTh seven-segmenT Led disPLays
Program 19-1 Displaying All the Segments on One Display, One after the Other, Rapidly So That They Look Like They Are All on Simultaneously (continued)
4: repeat delay outa[8..15]:=%01_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_110 5: repeat delay outa[8..15]:=%01_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_110 6: repeat delay outa[8..15]:=%01_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_011_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 7: repeat delay outa[8..15]:=%11_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111
(continued)
seven-segmenT disPLays: disPLaying nUmBers WiTh seven-segmenT Led disPLays
Program 19-1 Displaying All the Segments on One Display, One after the Other, Rapidly So That They Look Like They Are All on Simultaneously (continued)
8: repeat delay outa[8..15]:=%01_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_011_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_111 9: repeat delay outa[8..15]:=%01_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_110_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_111 10: repeat delay outa[8..15]:=%01_111_111 outa[8..15]:=%10_111_111 outa[8..15]:=%11_011_111 outa[8..15]:=%11_101_111 outa[8..15]:=%11_111_111 outa[8..15]:=%11_111_011 outa[8..15]:=%11_111_101 outa[8..15]:=%11_111_111 11: repeat delay*20 'blanks display for a while outa[8..15]:=%11_111_111 if index>11 index:=0
One display can be placed comfortably on the education board after the LCD display is removed. We will use the same lines as were used to control the LCD to control the seven-segment display (7SD). This will keep wiring disruption to a minimum when we want to return to the use of the LCD for further experimentation. The segments are lighted one segment at a time, as shown in Program 19-1. Each digit is displayed delay number of times. The displaying sequence is so fast that we do not notice the blinking of the segments.
seven-segmenT disPLays: disPLaying nUmBers WiTh seven-segmenT Led disPLays
Because only one segment is lit at any one time, the Propeller electronics are not overloaded and we do not have to go through the buffers for more power. Here are the rules we followed:
Only one task in each cog. Only one segment can be on at any one time. Run the segment changes as fast as possible. Use the common anode design of the 7SD to our advantage so the Propeller is used as a sink rather than a source of power.
If we were using more than one display, we would wire all the segments in parallel and connect them to the Propeller one at a time by selecting the common anode connection of each one in a round-robin fashion. This is shown schematically in Figure 19-5.
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