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5.24 Schematic of IR DTMF transmitter circuit
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of the transistor. Although the IR LED may be connected directly to the output of the 5089, the power output would be small. The NPN transistor allows additional current to power the LED. Figure 5.25 shows the front end of the IR receiver. An IR phototransistor is coupled to a CMOS op-amp. This combination of components allows the receiver chip (8870) to lock in on the IR radiation from a distance of several feet. Remote control Using the IR link, you should be able to press a number on the keypad and see the corresponding number displayed on the digital display. Test the IR link at this point for maximum distance and direction. You should be able to increase the distance by placing the IR LED and phototransistor in their own reflectors. The light reflector from an old flashlight will work well. The remote control begins by adding a 4028 IC. The 4028 is a BCD-to-decimal decoder, meaning it reads the binary number (remember the four LEDs from Fig. 5.22) and outputs a single line equal to the decimal equivalent. The 4028 has 10 (0 to 9) output lines. Whatever 4-bit binary number is placed on its input lines, the 4028 outputs a high signal on that output line (see Fig. 5.26). @@@@@@@ &&&&&&&&&
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It is not necessary to remove the 7448 and 7-segment display. The 8870 chip has sufficient output to drive both the 7448 and 4028. The digital display is pretty handy when checking the output from the 4028. For the sake of simplicity, Fig. 5.26 just shows the 4028 connected to the 8870.
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5.25 Schematic of front end of IR DTMF receiver
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5.27 Schematic of 4013 flip-flop
The output from the 4028 can be used directly to turn a switch or circuit on or off. However, this isn t an optimum situation, because as soon as you key another number (channel), the previous channel turns off (brings the line low). The solution to this problem is a 4013 D-type flip-flop (see Fig. 5.27). The flip-flop is a basic computer memory datum. In this circuit it is configured as a divide-by-two counter. Upon receiving the first on signal from the 4028, it turns its output line high. When the 4028 brings the line low, which happens when hitting another channel, the 4013 will keep its output line high (latched). To bring the 4013 output line low, simply key the channel for a second time. The second high signal to the 4013 brings the output line low (unlatched). One can continue to bring the 4013 output line high and low by alternately switching the input line high.
Machine vision
To reproduce human vision in a machine is a difficult task. One cannot simply connect a video camera to a computer and expect it
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to see. Programs (both neural and expert) must capture the video image and process it (extrapolate data). Machine vision has been achieved in limited and targeted areas. 1 looked at the Papnet computer, which uses neural software to analyze pap smear slides with a higher accuracy than can be achieved by humans. Other researchers have developed vision systems that can steer a vehicle based on the contours of the road being driven. Before we can attempt to simulate human vision, we need (in addition to developing improved image processing, which is no easy task in itself) to develop stereoscopic mounted video cameras. Some research in this area is taking place at the Massachusetts Institute of Technology (MIT) on their humanoid robot, COG. With stereoscopic cameras, two video pictures must be processed and then merged to create a three-dimensional (3D) representation. This is the same process used in human 3D vision. To estimate depth, each camera must be mounted on gimbals that allow the cameras to veer in (converge) and focus on an object. The amount of convergence is taken into consideration for judging the distance of objects. Machine vision is a fertile field of development. Currently most vision systems require a high-powered computer dedicated just to vision processing.
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