Interface & Instrumentation

ADC Sensor Interfacing

Gas Sensor

Temperature Sensor Humidity Sensor

Sonar Sensor

ADC Sensor Interfacing (Cont’d)

Characteristic:

1) Precision integrated-circuit2) Output voltage is linearly proportional to the Celcius3) Requires no external calibration (Internally calibration)4) Output: 10mV for each degree

ADC Sensor Interfacing (Cont’d)

10mV = 1 degree (Minimum)20mV = 2 degree30mV = 3 degree....1000mV = 100 degree (Maximum)

Vref = ???

5V

1.024

Step Size = 4.8mV

Step Size = 1mV

Vin (max) = 5V

Vin (max) = 1.024V

Which one suitable?

How to set Vref??

ADC Sensor Interfacing (Cont’d)

To overcome any fluctuations in power supply.

* Please see Program 13-4 page 524