This is 2.2 portion of the PICBasic Pro lab. Read the LM35 temperature sensor da

Question

This is 2.2 portion of the PICBasic Pro lab. Read the LM35 temperature sensor datasheet. Figure out how the output of the temperature sensor voltage corresponds to the actual temperature in Centigrade.

Using the program written in 2.1, add the PICBasic Pro statements need to do the following:

If the temperature sensor output voltage V0 3.33V, blink the Red LED.

If the temperature sensor output voltage is 1.67V < V0 <3.33V, blink the Green LED.

If the temperature sensor output voltage is V0 <1.67V, blink the Blue LED.

DEFINE         LCD_DREG          PORTC                                  ; Set LCD Data Port C

DEFINE         LCD_DBIT            4                                              ; Set starting bit 4

DEFINE         LCD_RSREG        PORTC                                  ; Set Register Select Port C

DEFINE         LCD_RSBIT          0                                              ; Set Register Select bit 0

DEFINE         LCD_EREG          PORTC                                  ; Set Enable Port C

DEFINE         LCD_EBIT               1                                              ; Set Enable bit 1

DEFINE         LCD_LINES          2                                              ; Set to 2 line display

DEFINE         LCD_COMMANDUS    1640                               ; Set command delay time 1.64ms

DEFINE         LCD_DATAUS     44                                           ; Set data delay time 44us

DEFINE         ADC_BITS               10                                           ; Set number of bits in digital value

ADCON0.7=1                                                                                  ; Right justify digital value

ADCON0.6=0                                                                                  ; 5V is reference

TRISC=%00001100                                                                    ; Set up bit of Port C for outputs

ANSEL=%11001111                                                                   ; Set up bits for digital I/O

ANSELH=0                                                                                      ; Set up bits for digital I/O

; Declare 16-bit variables

adcval VAR WORD

adcint VAR WORD

adcdec VAR WORD

PAUSE 500

loop:       ADCIN 2,adcval

                adcval=adcval*49/10

                adcint=adcval/1000

                adcded=adcval/1000

LCDOUT $FE,1

LCDOUT DEC adcint, “.”, DEC adcdec, “V”

PAUSE 1000

GOTO loop

END

16F690 Pinout

LM35 Datasheet

http://www.ti.com/lit/ds/symlink/lm35.pdf

OSC2 OUT DIG 10 U/DIG 54 00T 11U 11E +OABC_+ P IC 16F690 DCCT C-D OORFEDGDU 456789

Explanation / Answer

1 Features

1

• Calibrated

Directly

in Celsius

(Centigrade)

• Linear

+ 10-mV/

°C Scale

Factor

• 0.5°C Ensured

Accuracy

(at 25°C)

• Rated

for Full

55°C to 150°C Range

• Suitable

for Remote

Applications

• Low-Cost

Due to Wafer-Level

Trimming

• Operates

from

4 V to 30 V

• Less

than

60-

A Current

Drain

• Low Self-Heating,

0.08°C in Still Air

• Non-Linearity

Only

±¼°C Typical

• Low-Impedance

Output,

0.1

for 1-mA

Load

2 Applications

• Power

Supplies

• Battery

Management

• HVAC

• Appliances

Description

The

LM35

series

are

precision

integrated-circuit

temperature

devices

with

an output

voltage

linearly-

proportional

to the

Centigrade

temperature.

The

LM35

device

has

an

advantage

over

linear

temperature

sensors

calibrated

in Kelvin,

as the user

is not required

to subtract

a large

constant

voltage

from

the output

to obtain

convenient

Centigrade

scaling.

The

LM35

device

does

not require

any

external

calibration

or trimming

to provide

typical

accuracies

of ±¼°C at room

temperature

and ±¾°C

over

a full

55°C to 150°C temperature

range.

Lower

cost

is assured

by trimming

and

calibration

at the

wafer

level.

The low-output

impedance,

linear

output,

and precise

inherent

calibration

of the LM35

device

makes

interfacing

to readout

or control

circuitry

especially

easy.

The device

is used

with single

power

supplies,

or with

plus

and

minus

supplies.

As the

LM35

device

draws

only 60

A from

the supply,

it has

very low self-heating

of less than

0.1°C in still air. The

LM35

device

is rated

to operate

over

a

55°C to

150°C temperature

range,

while

the LM35C

device

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