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automatic-humidifier-e7cb30-en.md

This is my second Arduino Project. I'm studying in Boston and found that the air is so dry, especially in the evening. So I came up with this idea: what if the humidifier could turn on and off automatically to maintain a specific and comfortable humidity in the air? So I spent a whole day designing the circuits and programming.

Here's a video.

Video:

🛠️ Deep Dive / Technical Analysis

The Automatic Waste Segregator is a socially impactful project that addresses one of the biggest challenges in recycling: contamination. By automating the sorting process at the source, we can significantly increase the efficiency of recycling plants.

![images/projects/expanded/images/projects/expanded/waste_segregator_conveyor_1772704538085.png)

How It Sorts

The system typically uses a combination of sensors to classify objects as they pass by on a small conveyor belt or fall through a chute:

  1. Inductive Proximity Sensor: Detects metallic objects (cans, metal tops).
  2. Capacitive Sensor: Can help distinguish between different non-metallic materials like plastic or cardboard based on their dielectric properties.
  3. Moisture Sensor: Sometimes used to detect organic/wet waste.

When a material is identified, the Arduino triggers a Servo Motor or a Stepper Motor to push the item into the correct collection bin.

Key Hardware

  • Arduino Uno: The master controller.
  • Inductive Sensor (LJ12A3-4-Z/BX): For metal detection.
  • Micro Servo (SG90) or larger: For the sorting arm mechanism.
  • Conveyor Belt Kit: Including a DC motor and pulleys.
  • LCD Display: To show statistics like "Plastic count: 12, Metal count: 5".

![images/projects/expanded/images/projects/expanded/waste_segregator_bins_detail_1772704552462.png)

Engineering Challenges

The main challenge in this project is mechanical alignment and timing. The Arduino must detect the object and then wait for the exact moment when the object is in front of the sorting arm before triggering the movement. This project is a fantastic introduction to industrial automation and mechatronics.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Automatic Humidifier"
description: "Automatically turn on the humidifier when the environment humidity is below 50%."
author: "chenwei19940207"
category: "Home & Automation"
tags:
  - "humidity"
  - "humidifier"
  - "arduino"
  - "dht11"
views: 44621
likes: 8
price: 1120
difficulty: "Easy"
components:
  - "1x DHT11 Temperature & Humidity Sensor (4 pins)"
  - "1x Digilent Screwdriver"
  - "1x Standard LCD - 16x2 White on Blue"
  - "1x Arduino UNO"
  - "1x Humidifier"
  - "1x Resistor 1k ohm"
  - "1x Breadboard (generic)"
  - "1x Rotary potentiometer (generic)"
  - "1x Jumper wires (generic)"
  - "5x Resistor 10k ohm"
  - "1x Resistor 330 ohm"
  - "1x LED (generic)"
tools: []
apps: []
downloadableFiles: []
documentationLinks: []
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