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PROTOTYPE

MODEL 1

As a temperature sensor we will use the LM35, an integrated circuit that returns a linearly temperature dependent voltage. The sensor is already calibrated in degrees Celsius, Celsius, on a scale of 1 degree centigrade for every 10 milli volts.

Components

Arduino

A protoboard

A temperature sensor LM35

A led

Circuit

The circuit of this project consists of two parts. On the one hand, the temperature sensor and on the other hand, the led that we will turn on when the temperature passes a threshold.

The circuit with the LM35 sensor is very simple. It is a component with three legs. When viewed from the front, we have to feed it with a voltage of 5 Volts by the left leg. The right leg is the leg that goes to earth. And the central leg is the one that gives us the analog voltage proportional to the temperature, voltage that we will later convert to the corresponding temperature. For more information consult the spec sheet of this sensor.

The circuit of the led is the same circuit that we have been using in other projects.

DIAGRAM