SAS Module 3

What is the role of a sensor in a system?

• Act as the brain of the system
• Detect and respond to physical inputs
• Process inputs
• Measure distance

What is the function of a pull-down resistor in a circuit?

• Connects digital pin to GND
• Overrides the resistor
• Measures the current flow
• Keeps the circuit inactive

How does an ultrasonic sensor detect distance?

• Sends out a light pulse
• Measures sound intensity
• Sends out a sound pulse
• Measures the time taken by sound waves

What does a trigger pulse do in an ultrasonic sensor?

• Keeps the pin at LOW
• Sends out a sound wave
• Measures the reflected wave
• Measures the current flow

Which type of sensor would you use to detect light intensity?

• Digital sensor
• Analog sensor
• Temperature sensor
• Motion sensor

What kind of output does a digital sensor provide?

• HIGH or LOW
• Continuous values
• Voltage only
• Binary numbers

What is an example of an analog sensor application?

• Measuring pressure
• Reading light intensity
• Measuring voltage
• Reading temperature

What keeps a digital pin LOW when no button is pressed?

• The resistor
• The sensor
• The button
• Pull-up resistor

What does a sensor use to detect motion?

• Light
• Sound
• Pressure
• Heat

What is the primary difference between analog and digital sensors?

• Size of the circuit
• How they connect to the Arduino
• The type of output signal
• Size of the input