1. Grade 3 Lesson 5
Smart Doorbell

2. Warm-Up
Can you get to the other side of the classroom without disrupting the lasers?

3. What is the function of these sensors?
Mini-lesson
What is the function of these sensors?
Motion
Sensor
Smoke
Sensor
Temperature
Sensor
Are they suitable for their purpose?

4. Mini-lesson
How can the design of a doorbell be made more effective using sensors?

5. Complete the keyword activity in your Student Handout:
Keywords
Complete the keyword activity in your Student Handout:
Sensor
Doorbell
Laser
Smart Technology
Function

6. Let’s Discuss
Which type of sensor would set off an alert if someone stepped on it?
A Smoke Sensor.
A Heat Sensor.
A Pressure Sensor.
2. With a partner, discuss how a sensor
could be used to improve a doorbell for a
user with hearing or sight impairment.

7. Let’s Discuss
Which type of sensor would set off an alert if someone stepped on it?
c. A Pressure Sensor.

8. Utilize a sensor in the system
Let’s Build!
Utilize a sensor in the system
Light Sensor:
‘As a sensor’
RGB LED:
Select a color

9. Challenge 1
Create a doorbell with an audio and visual alert that is activated when someone approaches
The On/Off
activates the Sound Player which needs a True/False input
Filter
Select ‘0-15’
Sound Player:
‘Doorbell’

10. Checks for Understanding
Why is a Filter block used in the system?
It allows a set range of values through.
It ensures the system stays on.
It allows any light reading to activate the system.
2. What is a sensor?
A device which detects or measures an input and makes sure nothing changes.
A device which changes every few minutes.
A device which detects or measures an input and records or responds to it.

11. Checks for Understanding
Why is a Filter block used in the system?
It allows a set range of values through.
2. What is a sensor?
c. A device which detects or measures an input and records or responds to it.

12. Debug It!
How can we ensure the Sound Player sounds at a set time interval?
Interval:
6 seconds

13. Challenge 2 Create an improved system: Add an image capture feature
Make it more effective for users with hearing impairments
Add 1 virtual RGB LED: Set two different colors
The Camera will activate at the same interval that has been set for the Sound Player.
Add 2 Intervals:
set one to 3 seconds
set one to 5 seconds

14. Checks for Understanding
What is the role of the Interval block in the system?
It enables the outputs to be activated continuously.
It enables the output to be activated at set time intervals.
It enables the output to be activated every minute.
2. What is it that makes this system reflect ‘smart’ technology?
The system is created on an app.
The system uses electricity.
A sensor is used.

15. Checks for Understanding
What is the role of the Interval block in the system?
b. It enables the output to be activated at set time intervals.
2. What is it that makes this system reflect ‘smart’ technology?
c. A sensor is used.

16. Chilli Challenges
Experiment with the Cycle Colors and Cycle Brightness blocks. Can you create a more effective light alert for your ‘smart doorbell’?
Experiment with the Buzzer and Hold blocks. Can you create a more effective sound alert for your ‘smart doorbell’?
Experiment with adding a DC Motor block. Can you create a moving element to your ‘smart doorbell’?

17. What have you learned today? Can you draw your system?
Exit Ticket
What have you learned today?
Can you draw your system?