vb.net barcode reader from image Enable the chip Read ADC Value Read the High 8 Bits in Software

Encoding Quick Response Code in Software Enable the chip Read ADC Value Read the High 8 Bits

Enable the chip Read ADC Value Read the High 8 Bits
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IF (x > 72) THEN ' Between 20 and 10 cm Slope = ABS(72 - 123) ' Slope is divisor per 10 cm ZeroPoint = 10 + ((123 10) / Slope) y = ZeroPoint - ((x 10) / Slope) DEBUG "Distance = ", DEC y, " cm", CR ELSE IF (x > 51) THEN ' Between 30 and 20 cm Slope = ABS(51 - 72) ' Slope is divisor per 10 cm ZeroPoint = 20 + ((72 10) / Slope) y = ZeroPoint - ((x 10) / Slope) DEBUG "Distance = ", DEC y, " cm", CR ELSE IF (x > 38) THEN ' Between 40 and 30 cm Slope = ABS(38 - 51) ' Slope is divisor per 10 cm ZeroPoint = 30 + ((51 10) / Slope) y = ZeroPoint - ((x 10) / Slope) DEBUG "Distance = ", DEC y, " cm", CR ELSE IF (x > 28) THEN ' Between 50 and 40 cm Slope = ABS(28 - 38) ZeroPoint = 40 + ((38 10) / Slope) y = ZeroPoint - ((x 10) / Slope) DEBUG "Distance = ", DEC y, " cm", CR ELSE ' Further Away than 50 cm DEBUG "Nothing In front of GP2D12", CR ENDIF ENDIF ENDIF ENDIF PAUSE 250 LOOP END ' Delay to 4x per second
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The development of the slope and the line was not trivial (although it does not look very complex in the code above) and it is calculated from first principles you learned in high school math. The lines that are produced are actually counterintuitive because the x axis is
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OBJECT DETECTION
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voltage while the y axis is distance (most graphs will show this data in reverse). When you are developing a project like this one, make sure that you use lots of DEBUG statements to verify the software calculations against your own. Because the BS2 cannot perform floating point operations, you will find that you will have to do strange things, like make your slopes in units of 10s of mV per decameters. The distance output is surprisingly accurate although it quickly diminishes when the power supply voltage varies from 5 V. In the schematic (Fig. 30-8) and parts list (Table 30-4), four AA alkaline batteries are specified, which will produce approximately 6 V (20% higher than the nominal voltage). In the prototype circuit, a Parallax BASIC Stamp Homework Board was used, which produces 5 V from a regulator, and the distances output matched measured distances surprisingly well.
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30.2.4 PASSIVE INFRARED DETECTION
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You can use commonly available passive infrared detection systems to detect the proximity of humans and animals. These systems, popular in both indoor and outdoor security systems, work by detecting the change in infrared thermal heat patterns in front of a sensor. This sensor uses a pair of pyroelectric elements that react to changes in temperature. Instantaneous differences in the output of the two elements are detected as movement, especially movement by a heat-bearing object, such as a human. You can purchase pyroelectric sensors commonly referred to as PIR, for passive infrared new or salvage them from an existing motion detector. When salvaging from an existing detector, you can opt to unsolder the sensor itself and construct an amplification circuit around the removed sensor, or you can attempt to tap into the existing circuit of the detector to locate a suitable signal. Both methods are described next.
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30.2.5 USING A NEW OR REMOVED-FROM-CIRCUIT DETECTOR
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Using a new PIR sensor is by far the easiest approach since new PIR sensors will come with a data sheet from the manufacturer (or one will be readily available on the Internet). Some sensors such as the Eltec 422 have built-in amplification, and you can connect them directly to a microcontroller or computer. Others require extra external circuitry, including amplification and signal filtering and conditioning. If you prefer, you can attempt to salvage a PIR sensor from a discarded motion detector. Disassemble the motion detector, and carefully unsolder the sensor from its circuit board. The sensor will likely be securely soldered to the board so as to reduce the effects of vibration. Therefore, the unsoldered sensor will have fairly short connection leads. You ll want to resolder the sensor onto another board, being careful to avoid applying excessive heat. Fig. 30-9 shows a typical three-lead PIR device. The pinouts are not industry standard, but the arrangement shown is common. Pin 1 connects to +V (often 5 V); pin 2 is the output, and pin 3 is ground. Physically, PIR sensors look a lot like old-style transistors and come in metal cans with a dark rectangular window on top (see Fig. 30-10). Often, a tab or notch will be located near pin 1. As even unamplified PIR sensors include an internal FET transistor for signal conditioning, the power connect and output of the sensor are commonly referred to by their common FET pinout names of drain and source.
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