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If the sensor incorporates an internal output amplifier and signal conditioner, its output will be suitable for direct connection to a microcontroller or other logic input. A buffer circuit, like that shown in Fig. 36.6, is often recommended to increase input impedance. The
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FIGURE 36.4 Most PIR sensors are large, transistorlike devices with a fairly common pinout arrangement. This is a block diagram of how the typical PIR sensor works.
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FIGURE 36.5 The PIR sensor has an infrared window on the top to let in infrared heat radiated by objects. Movement of those objects is what the sensor is made to detect, not just the heat from an object.
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circuit uses an op amp in unity gain configuration. If the sensor you are using lacks a preamplifier and signal condition, you can easily add your own with the basic circuit shown in Fig. 36.7. With both the circuits shown in Figs. 36.6 and 36.7 the ideal interface to a robot computer or microcontroller is via an analog-to-digital converter (ADC). Many microcontrollers offer these onboard. If your control circuit lacks a built-in ADC, you can add one using one of the approaches outlined in 29, Interfacing with Computers and Microcontrollers. The output of the PIR sensor will be a voltage between ground and V For example s . sake, let s assume the output will be the full 0 5 volts, though in practice the actual volt-
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2 From PIR R1 1K
7 IC1 LM741 3 + 4
Output
FIGURE 36.6 Use a buffer circuit between the output of the amplified PIR device and the microcontroller or other logic input.
R1 1K From PIR
R2 1M 6 Output
IC1 LM741 3 + 4
FIGURE 36.7 If the PIR sensor you are using lacks a built-in output amplifier, you can construct one using commonly available op amps.
age switch will be more restricted (e.g., 2.2 to 4.3 volts, depending on the circuitry you use). Assuming a 0 5 vdc output, with no movement detected, the output of the sensor will be 2.5 volts. As movement is detected, the output will swing first in one direction, then the other. It s important to keep this action in mind; it is caused by the nature of the pyroelectric element inside the sensor. It is also important to keep in mind that a heat source, even directly in front of the sensor, will not be detected if it doesn t move. For a PIR device to work the heat source must be in motion. When programming your computer or microcontroller, you can look for variances in the voltage that will indicate a rise or fall in the output of the sensor.
Hacking into a motion detector board
Rather than unsolder the PIR sensor from a motion detector unit, you may be able to hack into the motion detector circuit board to find a suitable output signal. The advantage of this approach is that you don t have to build a new amplifier for the sensor. The disadvantage is that this can be hard to do depending on the make and model of the motion control unit that you use. For best results, use a motion detector unit that is battery powered. This avoids any possibility that the circuit board in the unit also includes components for rectifying and reducing
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an incoming AC voltage. After disassembling the motion detector unit, connect 5 vdc power to the board. (Note: Some PIR boards operate on higher voltages, usually 9 12 volts. You may need to increase the supply voltage to properly operate the board.) Using a multitester or oscilloscope (the scope is the preferred method) carefully probe various points on the circuit board and observe the reading on the meter or scope. Wave your hand over the sensor and watch the meter or scope. If you re lucky, you ll find two kinds of useful signals:
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