HOW to Detect Ambient Temperature with Kidspico

By r November 25th, 2024 75 views

It is necessary to monitor the atmospheric temperature in the natural environment in real time. If the temperature is too high, disasters such as fire may occur. When the normal temperature is detected, the green LED lights up; the yellow LED is a reminder for raising temperature; if red LED is on, be very careful because it indicates a high temperature!

In this experiment, the XHT11 temperature and humidity sensor and the traffic light module to measure temperature range. Three colors of LED indicate three ranges of ambient temperature.

Flow

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Assembly

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Required Parts

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Step 1

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Step 2

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Step 3

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Step 4

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Step 5

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Step 6

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Completed

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Wiring Diagram

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Test Code

Open 4.5Temperature and humidity detection.py and click 1407 .

'''
 * Filename    : Temperature and humidity detection
 * Thonny      : Thonny 4.1.4
 * Auther      : http//www.keyestudio.com
'''
from machine import Pin
import time
import dht

#Connect XHT11 to pin (2)
XHT = dht.DHT11(Pin(2))

red = Pin(13, Pin.OUT)
yellow = Pin(14, Pin.OUT)
green = Pin(15, Pin.OUT)

# attain temperature and humidity value per second and print them
while True:
    XHT.measure() # enable XHT11 sensor to measure the values once
   # call dht built-in function to attain tempreature value, and print it on Shell
    print('temperature:',XHT.temperature())
    time.sleep(0.1)
    if XHT.temperature() > 35:
        red.on()
        yellow.off()
        green.off()
    elif XHT.temperature() > 29:
        yellow.on()
        red.off()
        green.off()
    elif XHT.temperature() > 24:
        green.on()
        red.off()
        yellow.off() 

Code Explanation

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Conceive:

Set three thresholds to separate the temperature range: 24, 29, 35, which are adjustable according to needs.

preference temperature: 24°C ~ 29°C
warning temperature: 29°C ~ 35°C
high temperature: over 35°C

Corresponding LED will light up when the ambient temperature is within the related ranges.

Within preference temperature range: the green LED lights up
Within warning temperature range: the yellow LED lights up.
Within high temperature range: the red LED lights up.

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Code structure:

Initialization. set the pins of XHT11 temperature and humidity sensor and the traffic light module.
Loop.

XHT11 sensor reads and outputs the temperature values.

Determine which section the temperature value is in, so then light up corresponding LED.
- 24°C ≤ temperature < 29°C: the green LED lights up and other LEDs are off.
- 29°C ≤ temperature < 35°C: the yellow LED lights up and other LEDs are off.
- temperature > 35°C: the red LED lights up and other LEDs are off.