Arduino Uno Quick Start Manual page 152

Building a TV Thermometer 135
Figure 24 Circuit of the TV thermometer
Don t get confused by what the circuit for the video signal looks like in the
circuit diagram. That s how you would build the circuit on a breadboard. Of
course, you can still connect the modified RCA cable directly to the Arduino.
Then connect the circuit for the TMP36 sensor.
Before we dive into the project s code, have a look at what we re trying to
build.
On the left side of the screen, you see
a graphical representation of a typical
thermometer. It has a scale ranging
from 5.5 to 40 degrees Celsius. The
thermometer isn t a static image. The
bar in the middle will grow or shrink
depending on the current tempera-
ture.
On the right side of the screen, we
display the current temperature as
text. All in all, we have to output some
text, and we have to draw some graphics. It s a perfect opportunity to meet
TVout s most important functions, so let s see how it works.
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