Electric Circuits & Arduino Basics Laboratory
Engineering 100 Lab Report Week 6 and 7
Rook, Jaxson
College of Engineering and Computer science
Unviersity of Michigan – Dearborn
Dearborn Michigan
[email protected]
Team 6
Abstract— In lab over the last two weeks we used the use of
code to control things like LED or motor timing. We then learned
the use of an H bridge. In the end we put together all of these
tools to make a tour of our choice.
Keywords— Arduino, Circuits, H bridge, Design,
Breadboard, Motor, LED
I. SUMMARY OF LAB
Lab lasted two weeks. In the first week we explored the world
or coding and arduinos, then in week two we used our new
knowledge to create a toy. In week one we started off using
LEDs and resistors and how changing things impacted others.
We started with a resistor and LED. Then using the same
resistor we wired it to multiple LEDs and found that resistance
increases in a series. We then used two resistors and two LEDs.
After that we increases the strength of the resistor and found
the LED to be dimmer that the lower resistance value. We then
coded the LEDs so they would turn on separately and together.
Then given an Hbridge and motor we found out how to code it
to turn different directions and vary its speed. In week two we
came up with a vibrating toy. We had some difficulties with out
Arduino and breadboard so we couldn’t create an elaborate toy
like we wanted. It used a DC motor to vibrate and we coded it
so you would have to use a bush button to control the toy.
II. PART 1: ELECTRIC CIRCUITS
A. For section 1.1 and 1.2 “Connect the circuit as shown in
Figure 2 using resistors of the same resistance and
observe the intensity of the LED “ answer the following
questions
● What caused the difference in LED intensity between
the configurations in Figures 1 and 2?
The LED is less intense in figure 2 than figure 1. The
reason this is, is because in figure 2 there is 2 resistors
compared to the one in figure 1.
● For Figure 2, calculate the equivalent resistance, Req,
of the two resistors in series.
Req = 220 Ω + 220 Ω = 440 Ω
B. For section 2.1 “Connect the circuit as shown in Figure 3
and observe the intensities of the LEDs (use the resistors
of the same resistance). “
● What do you notice about the circuit on the left? Is the
circuit on the left open or closed?
The circuit on the Left had 1 LED and the circuit on
the right has 2 LEDs. The circuit with 1 LED is open
and the Circuit with 2 LEDs is closed.
C. For secion 2.2 “Replace one of the resistors with a
different resistance as shown in Figure 4 and observe the
intensities of the LEDs.”
● What caused the difference in intensity between the
configurations in Figures 3 and 4?
If a resistor of higher ohms is used on the lower LED, the
intensity will be lower than the LED attached to a resistor of
lower ohm.