12. Output Devices

Group assignment:

• 1.Measure the power consumption of an output device.
• 2.Document your work on the group work page and reflect on your individual page what you learned.

Individual assignment:

• Add an output device to a microcontroller board you've designed and program it to do something.

Group Assignment

Here is a test video for we observate a DC motor drive by a regulated power supply which is analog signal.

WANPTEK GPS605D DC POWER SUPPLY
Input voltage:AC 220V 50Hz
Output voltage:0 ~ 60V
Output current:0 ~5A
Voltage resolution:10mV
Current resolution:1mA
Indicator Meter:
Voltage display precision: +-(0.5% of rdg + 2 digits).
Current display precision: +-(0.5% of rdg + 2 digits)

Observation:
We used CC mode to observe the change of voltage and the movement of the motor. The smaller the current, the smaller the voltage, according to P=I*V, the smaller the power consumption of the DC motor. When the current is less than 0.03A, the motor stops working.

We also test the adigital signal part with a magenet sensor.

t run with 3.3V. When it's nothing there we read the 0v

When we put a little magnet there, it will send a HIGH signal to arduino, we read as 3,3v.

Individual assignment

• I use HC-SR04 ultrasonic sensor to test, it is a very popular sensor for rough distance measurement.

The test I did the week when I designed xiao expension board.

I asked chatgpt to write a code for hc-sr04 to make a distance sensor. It's precislly correct.

Here is a test video.