Interfacing LM 35 Temperature sensor with Raspberry pi pico

micropython code for High Temperature Indicator.\

# importing the required libraries

from machine import ADC

from machine import Pin

import time

# declare constants

DIODE_OFFSET_VOLTAGE = 0.929 # unit : volt

led_green=Pin(25,Pin.OUT)

led_red=Pin(15,Pin.OUT)

# declaration of pin objects

analogInputPin = ADC(28) # only one positional argument

# which is pin id

# main logic of the program

while True:

# read raw analog signal value

analogValue = ADC.read_u16(analogInputPin)

# calculate sensor output voltage from raw Analog value

sensor_voltage = (analogValue / 65535) * 3.3 # unit : Volt

# convert to milli volts

sensor_voltage = (sensor_voltage - DIODE_OFFSET_VOLTAGE ) * 1000 # unit : milli volt

# calculate temperature from sensor voltage (in millivolt)

# from datasheet

# 1 degree celcius = 10 milli volt

temperature = (sensor_voltage/10 ) # unit : degree celcius

time.sleep(1)# sleep is just for demonstration , vary it as per need

print("Temperature = ", temperature, " degree celcius")

print("\n")

if temperature <30:

led_green.on()

else:

led_green.off()

if temperature >31:

led_red.on()

else:

led_red.off()

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