Arduino Day 4

Why do we use a motor driver?

• To control the speed of a DC motor

• To control the direction of a DC motor

• To handle the current load of a DC motor

• Because we don't know how to drive

What is the difference between a servo motor and a DC motor?

• Servo motor spins continuously, whereas DC motor can only spin 0 to 180 degree

• Servo motor is ideal for making wheels spin, whereas DC motor is ideal for making robotic arm waves

• We can achieve precise angle rotation using Servo motor, but we can't do that with DC

• We can use a DC motor to control stuff that spins continuously and don't need precise angle control such as cars and drone

We use ___ to control the speed of a DC motor

(tips: 3 characters)

Which one(s) below about motor driver is/are correct? (for both L298N and L293D)

• When we give a HIGH to IN1, the OUT1 will also be HIGH

• The ENA controls the amount of voltage (speed) for OUT1 and OUT2, while ENB controls the amount of voltage (speed) for OUT3 and OUT4

• The motor drivers don't need a power supply to work (5v-12v)

• for L293N you also want to connect a 5V to pin 16; also you want to connect each ground for each "section" used. For example, if you used IN1 and OUT1, then u want to connect the ground at pin4

The servo motor usually can only rotate from 0 to 360 degree

• True

• False

We use library so

• we can simplify our codes

• we can spend more time and efforts writing the program that other people have already written

• we can save our efforts

• we can save our time

Which one below is the correct syntax for including a library in Arduino?

• 
• 
• 
• 

Which one below is false?

• We use PIR sensor to detect human

• We use Ultrasonic Distance sensor to sense distance

• We use TMP36 to sense gas

which one below is correct about an PIR sensor?

• Don't need to power up, whenever there's human in the "vision range" the output pin will become HIGH

• Power up with 5V and GROUND, whenever there's human in the "vision range" the output pin will become HIGH

• Power up with 5V and GROUND, any object moving in the "vision range" will trigger the outpin pin and make it HIGH

• Connect the output pin to a digital pin, and set the digital pin to output, so we can read the voltage from the output pin

Which one(s) below is/are correct about Ultrasonic Distance Sensor?

• The receiver of the sensor will transmit ultrasonic whereas the transmitter of the sensor will receive ultrasonic wave

• Whenever the receiver receives ultrasonic wave, the echo pin will become HIGH, otherwise LOW

• When we output a HIGH to the trig pin the transmitter will output Ultrasonic Wave

• the data we received on the echo pin will automatically tell us the distance, we don't need to do math