Breadboard
1st Try
I was not familiar with how breadboard works at that time and I just tried to follow the video. Obviously,I failed to light my LED.(I tried two kinds of wires this time.)
Find out how my DC power works! Replaced by jump wire later and it’s more stable.
2nd Try
Then I read the following materials later and figure out the breadboard working principles.
I light my LEDs this time.
I also tried to make an alarm bell with blue and red Leds.
Question:
I used the red wire to connect the positive pole.If I use the red wire to connect the voltage regulars “Ground”,the Led will flash.I don’t know why and not sure whether it’s safe.
Switches
They are going well.Only problem is that I spent a lot of time to figure out how the motor use.
There is something wrong with the screws on the back of my multimeter. I sent it back for a new one.