As shown in Figure 20-1, the breadboard analog circuit is quite simple to build, and requires only a thermistor and a 10KΩ fixed resistor wired in series. Where the two components are tied together, a jumper wire connects between them and pin A3 of the Arduino microcontroller.
The Temperature Indicator can be built using the Fritzing wiring diagram shown in Figure 20-2. Since there are only two electronic components, you have plenty of room for electrical wiring and breadboard placement of the components. Although the Fritzing wiring diagram shows a small breadboard, you can alternatively use the MakerShield protoboard to build the Temperature Indicator.
Figure 20-2. The Temperature Indicator Fritzing wiring diagram
TECH NOTE
A thermistor is a special variable resistor that changes its resistance based on temperature.
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