[igCS] Sensors

[igCS] Sensors

Objectives

• describe how a range of sensors can be used to input data into a computer system, including light, temperature, magnetic field, gas, pressure, moisture, humidity, pH and motion

Sensors

• Sensor is a type of input device

• Automatically collect data from physical environment

• Sensor usually collects analog data

Open Ended

Why do we need ADC? [3 points]

Light sensors

• Detects intensity of ambient light

• It can be used in auto night light, or inside a barcode scanner to detect the reflected light from the barcode pattern

Inside a barcode scanner

Open Ended

Suggest one usage for light sensor, apart from barcode scanner or night light.

Temperature sensor

• Two types of temperature sensor:

• Non-contact (detecting infra-red radiation)

• Contact

Contact temperature sensor

• Temperature sensor is very common in household environment

• e.g. inside AC, electric kettle, heating system etc.

Open Ended

What sensors are present in a smartphone? Try to list all of them.

Sensors found in smartphone

• Motion Sensor (able to detect movement, orientation)

• Magnetic Field sensor (compass)

• Ambient Light sensor

• Microphone... and maybe more

https://www.youtube.com/watch?v=0QNiZfSsPc0&feature=emb_logo

Other types of sensors

• Gas sensor

• pH sensor

• Moisture(soil) and humidity(air) sensor

• Pressure

Multiple Choice

Which of the following sensor is to measure acidity of liquid?

• pH

• pressure

• temperature

• gas

Multiple Choice

Which of the following sensor is required to detect if there's LPG leakage?

• pH

• pressure

• temperature

• gas

Multiple Select

To monitor the quality of water, some sensors are required. Check all applies:

• pH

• temperature

• light intensity

• magnetic

Open Ended

Exit question: Describe what is sensor. [2 points]

Well done