Internet of Things with Raspberry Pi 3: Leverage the power of Raspberry Pi 3 and JavaScript to build exciting IoT projects by Maneesh Rao

Author:Maneesh Rao [Rao, Maneesh]
Language: eng
Format: azw3, epub
Tags: COM025000 - COMPUTERS / Expert Systems, COM067000 - COMPUTERS / Hardware / General, COM038000 - COMPUTERS / Hardware / Mainframes and Minicomputers
Publisher: Packt Publishing
Published: 2018-04-30T04:00:00+00:00

Figure 6.5

In our use case, the IR transmitter is an LED (refer to Figure 6.6), which emits infrared radiation. It looks like a normal LED, but the light emitted by it is not visible to the naked human eye:

Figure 6.6

The IR receiver detects the radiation emitted by the transmitter. In our use case, we use an infrared photodiode as the IR receiver (refer to Figure 6.7). The IR photodiode is different from the normal photodiode because it only detects infrared radiations:

Figure 6.7

Note that, when an IR photodiode is used in conjunction with an IR transmitter in an object detection circuit, then the wavelength of both the transmitter and receiver should match.

Let's look at the IR sensor module that we are going to use to build our surveillance system (refer to Figure 6.8):

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