Read the soil moisture level (Dry-Perfect-Wet) and display results on a corresponding LED.
This tutorial will show you how to use DHT11 with Arduino.
Simple Temperature Monitoring with DHT22 & Arduino.
by Muhammad Afzal
A simple tutorial on getting readings from an ultrasonic sensor
by Damien Murtagh
It reads from up to eight temperature sensors (DS18B20) and displays on the LCD display (16x2)
Give this the parameters you want and the LEDs will light up according to the temperature cold blue, green fine, red hot
by Team Luca McLoughlin
The VCNL4000 is a proximity sensor with an integrated ambient light sensor.
by Saudin Dizdarevic
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