Home Automation / Weekly Assignment 1

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 Weekly Assignment 1


To do:

  1. The intended user experience that the automation will provide
  2. Look into case studies of projects similar to what you want to achieve
  3. per [2] above, identify what kind of sensors you will need
  4. per [2] above, identify what kind of actuators you will need
  5. For [3] and [4], look into how these components work and how they're used
  6. Do window shopping online and prepare a BoM (Bill of Materials) of the components you will need

Process:

Smart mattress

Target:

When someone sits or lies on it, pressure sensors trigger body temperature measurement and automatically adjust the air conditioning temperature to achieve personalised climate control.


Concpet：

The mattress senses your presence and body temperature, automatically creating the most comfortable room temperature environment for you.


I've discovered a remote forehead thermometer that enables non-contact measurement of body temperature, making the process far less intrusive for the subject. I believe this innovation could serve as one of the core functionalities for my subsequent project.



I opted for a smart mattress because incorporating sensors into the previous blanket design proved impractical, given the need for regular washing. By using a mattress instead, I've avoided the issue of pressure sensors becoming waterlogged. Whenever someone lies down, the pressure sensors activate the temperature monitoring system.



3. I've decided to use a fan instead of an air conditioner, as the Arduino kit happens to include one.



Below is a list of materials I have compiled that I believe may be required.

  1. Pressure Sensor FSR402

  2. Infrared temperature sensor MLX90614

  1. ESP32 DevKit
  1. DC fan

  1. The transistor (such as 2N2222 or MOSFET) requires current amplification due to insufficient current from the ESP32 GPIO.

  2. A diode (1N4007) is connected in parallel across the fan terminals to prevent back EMF.

  3. Resistor (220Ω, 10kΩ)

  4. DuPont wire + breadboard

  5. Power supply (5V 2A)





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