LASER / PIR Alarm

Arduino UNO

Seed - Grove - LCD RGB Backlight

Laser Diode - 5mW 650nm Red

Seed - Grove - Red LED Button

Seed - Grove - Blue LED Button

Grove - Digital Light Sensor

Grove wrappers

Fixed Laser Mounting Stand

Base Shield V2

Seed - Grove - Buzzer

Grove - PIR Motion Sensor

In this tutorial we are going to create an alarm using a laser beam and a PIR sensor (passive infrared motion sensor).<div class="se-component se-video-container __se__float-none" contenteditable="false" style="width: 100%;"><figure style="width: 100%; height: 56.25%; padding-bottom: 56.25%; margin: 0px;"><iframe frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/p2ky2NjntTg" data-proportion="true" data-percentage="100%,56.25%" data-size="100%,56.25%" data-align="none" style="width: 100%; height: 100%;" data-index="0" data-file-size="0" data-origin="100%,56.25%"></iframe></figure></div>For this project we will use Grove modules, Makeblock structures, Grove wrappers, a 5mW / 650nm laser and an Arduino UNO with Grove Base Shield V2.0 for Arduino.When you turn on the circuit, a screen will appear to align the laser light beam. This functionality will help us to adjust the laser pointer to the exact position on the light sensor. Adjusting the beam at the exact point on the light sensor we will get the maximum value that the sensor can read (65535). In this way, if the light beam between the laser and the sensor is interrupted at some point, we will obtain a lower value than indicated and it will mean that an object has crossed it.When the laser pointer is in the correct position, the LCD screen will turn green with the text &#34;TEST: OK&#34; and the red button LED will blink, indicating that we can press it to continue. At this point we are ready to use the alarm. If the laser beam is not correctly positioned, the screen will remain red with the text “TEST: KO” and we will not be able to continue until it is correctly adjusted.<div id="gallery"><img id="gallery" src=https://projects.arduinocontent.cc/b9af2aa0-4df5-429e-823f-dd00c8bc5804.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/fec3a3c5-ea12-4bf9-9d00-ff8a871912de.jpg /><figcaption> </figcaption></div>Once the laser has been adjusted and the red button is pressed to continue, the current status of the alarms will be shown (initially they will be deactivated): “LASER Alarm: OFF” and “PIR Alarm: OFF”.<figure><img src=https://projects.arduinocontent.cc/5c629c47-d0e1-481a-a9df-bda90159c4d6.jpg /><figcaption> </figcaption></figure>To activate the alarm we have to press either of the two buttons (red or blue). Once the button is pressed, a countdown will appear accompanied by an acoustic signal to indicate the start of the alarm activation. During this process the led of the button pressed will also blink.Pressing the red button will only activate the laser. Pressing the blue button will activate both the laser and the PIR sensor.<figure><img src=https://projects.arduinocontent.cc/5994982d-3f62-4c4d-8ac5-cf5c7b4e574d.jpg /><figcaption> </figcaption></figure>Once the alarm is activated, the screen will turn green showing the sensors that are activated. If the blue button has been pressed, the texts: “LASER Alarm: ON” and “PIR Alarm: ON” will appear. If the red button has been pressed, the texts that will appear will be: “LASER Alarm: ON” and “PIR Alarm: OFF”.<figure><img src=https://projects.arduinocontent.cc/562106fd-0e94-4bfc-8339-c10571ea44bb.jpg /><figcaption> </figcaption></figure>Once the alarm is activated, if the PIR sensor detects a movement at a distance of about 3 m or an object interrupts the laser light beam, the alarm will turn on emitting a sound and causing the screen to turn red showing the text “Alarm ! ! ! ! &#34; followed by the name of the sensor that triggered the alarm.<figure><img src=https://projects.arduinocontent.cc/8100cd84-ca40-4b5e-aaf7-3794ca70206f.jpg /><figcaption> </figcaption></figure>To turn off the alarm, just press the button whose LED is blinking.We will connect the different Grove modules to the Shield “Grove Base Shield V2.0 for Arduino” as follows:<ul ><li >Grove Module: PIR Motion Sensor: D2 </li></ul><ul ><li >Grove Module: Red LED Button: D5</li></ul><ul ><li >Grove Module: Blue LED Button: D7</li></ul><ul ><li >Grove module: Buzzer: D3</li></ul><ul ><li >Grove Module: RGB LCD Backlight: I2C</li></ul><ul ><li >Grove Module: Digital Light Sensor: I2C</li></ul><figure><img src=https://projects.arduinocontent.cc/34ed01fe-e9ca-44da-8cf8-75a59eac5403.jpg /><figcaption> </figcaption></figure><figure><img src=https://projects.arduinocontent.cc/bf57430a-724a-4c8d-b39c-950df63db7bc.jpg /><figcaption> </figcaption></figure>The assembly will be as follows: <div id="gallery"><img id="gallery" src=https://projects.arduinocontent.cc/45f0400f-b2e4-4859-98cc-18301b92a884.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/8d796823-47a4-4203-8379-f75d98695218.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/a77b6b3b-aa0e-4031-a5cf-f3f37ebb2860.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/3c0cf95c-f9be-49f5-adb6-f9237c50609f.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/a3dec3d7-e15e-474b-b717-c047c521cd54.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/3122a8c2-a774-4bf9-91a5-335d1e405498.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/e1cd5f43-911d-42f7-aff6-13c1dcf478cc.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/1e4f6f06-a5dd-4d84-832b-e031b773797a.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/f24cc3f9-71fb-43df-ace5-9d7d9ac2f4ed.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/15de5e84-6121-4868-af24-7db3492a6d13.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/0f17ad7b-1489-45ca-9eba-8a63d4dce427.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/8be064a3-a01e-4339-9460-300b43f67c89.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/60b265e7-f8ed-4f1a-b854-1f54748bc7c7.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/8a3d83c0-b238-4ff8-95ef-cfeb718b0f84.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/2d2c4824-349f-4e1d-a225-7d11a6ab7eb1.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/4735270d-14af-4f5b-a169-d8f38ccc2dc5.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/807f75e9-f971-40b1-ad2b-9f465a41a66f.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/1009356e-a1ec-44bf-9156-9d5c7c9b88bb.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/999aaa82-8955-42a1-855c-395e9ab0d222.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/7ac04e6b-9810-42a3-959a-ce0d71114b4d.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/77b36752-ac04-4b24-bb3a-3db0a80f4c72.jpg /><figcaption> </figcaption><img id="gallery" src=https://projects.arduinocontent.cc/5106b788-da4a-45d9-b9c3-305eb6d0e4f8.jpg /><figcaption> </figcaption></div>We can supply the laser with a voltage between 2.8 and 5.2V DC (25mA max current draw)<figure><img src=https://projects.arduinocontent.cc/25a69f30-202a-4346-9c98-44d707833fc8.jpg /><figcaption> </figcaption></figure>

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