This document provides instructions for creating an infrared burglar alarm using a breadboard, LEDs, resistors, an infrared emitter, and infrared receiver. The alarm works by sending an invisible infrared beam between the emitter and receiver. If the beam is broken, the receiver will detect this and change a LED from green to red, signaling an alarm. Students are guided through assembling the electronic components on a breadboard, connecting it to a Raspberry Pi, and using Node-RED to program the Pi to change the LED color when the infrared beam is broken.

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Six Nations Polytechnic
STEM/STEAM - Tech Wednesdays
Feb 2018 – Class #1
Markus van Kempen
E: mvk@ca.ibm.com
T: @markusvankempen

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https://en.wikipedia.org/wiki/Six_Nations_Polytechnic

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Lecture 1 - February 2018
Creating
Infrared Breaker aka
Burglar Alarm

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• We building a Burglar Alarm using a Infrared Beam
• When the Beam is broken we will
• Change the ble Candle
• Green OK,
• Red = somebody broker the Beam – Alarm !!!
Objective

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How does it work?
Infrared
Emitter
(Clear LED)
IR Receiver
(Dark LED)
Invisible Infrared Beam

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How does it work?
Infrared
Emitter
(Clear LED)
IR Receiver
(Dark LED)
Turn RED

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• Breadboard
• 3 Resistors (2x 330 Ohm 10KOhm)
• IR Emitter, Receiver
• 1 Red LED for Testing
»
The pieces
- Materials should be in your box
Cables

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Pieces we need – these should be in your PI Box

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• A Diode (LED) lets the electricity thru only in one way
• Use Red Cable for the + (Power) and Black or Blue for Ground/GND
• The LED’s have a long and a short end ! Connect Long end with Power +
• For the IR Received we will use the short END
• Mark with tape so you know which is the 330Ohm Resistors and which is 10KOhm
Things to Remember!

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Electrical Schema

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• We will start with just the RED led .
Test setup

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• We will show you the configuration in person
• Video on YouTube – mvk channel
The result

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• Connect the output to the PI (yellow cable to the far left pin)
• Fire up your Node-RED in a browser
• http:// snp??.mybluemix.net/red)
• Get the code from Github see bookmark on browser
• https://github.com/SixNationsPolytechnic
– Userid snpkid?? /Password
– See 2018-01-BurglarAlam Folder
• https://github.com/SixNationsPolytechnic/2018-01-BurglarAlam/blob/master/BurglarAlarm.flow
• Make sure to view in raw mode
– Remember CTRL-A, CTRL-C and CTRL-V
– Import the Node-RED flow into Node-RED
Step Two

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Once Imported you should see the following flow

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• Adjust the Candle Number to your number
• Make sure you get Events/Message from the PI/Burglar Alarm
• Add the command to set the Candle to RED when the IR Beam is broken
Your Task Adjustments Flow.

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Setting the Light based on Events e.g when the Infra RED Beam is broken
MQTT
Code ble
Pi Send Ble command
to set color to red
Bluemix
Code

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• Back up your code into your github folder use your name or group number
• Delete the Node-RED flow
• Disassemble the breadboard and put the pieces back into the box
Last step

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Node-Red Flow & Presenation for the class are at
https://github.com/SixNationsPolytechnic/
The IoT Code for the PI and Candle can be found here
https://github.com/markusvankempen/playbulb
Videos
https://github.com/SixNationsPolytechnic/
Reference

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Six Nations Polytechnic
STEM/STEAM - Tech Wednesdays
Feb 2018 – Class #1
Markus van Kempen
E: mvk@ca.ibm.com
T: @markusvankempen

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Burglar Alarm
Setting up the
electronics