This is a design circuit for temperature to digital converter circuit
that is based control by LM35 IC. This LM35 is precision integrated-circuit
temperature sensors, whose output voltage is linearly proportional to the Celsius
(Centigrade) temperature. The LM35 thus has an advantage over linear
temperature sensors calibrated in ° Kelvin, as the user is not required to
subtract a large constant voltage from its output to obtain convenient
Centigrade scaling. The LM35 does not require any external calibration or
trimming to provide typical accuracies of ±1⁄4°C at room temperature and ±3⁄4°C
over a full −55 to +150°C temperature range. This is the figure of the circuit
schematic;
How this circuit
can work? This circuit is supply the power using 5VDC that produce by power
supply. And then the voltages enter the circuit as analog signal. This signal
is enter to the LM35 to detected and calculate by the sensor. The output signal
from LM35 send to the ADC converter to processing the digital signal. Before
the digital signal is send to the controller by pin 8, there are voltage for
reference that given to the amplifier. This reference is using as compare when
calculating in microcontroller or microprocessor.
