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plant-watering-system-without-relay-2af7bc-en.md

This project makes use of a soil moisture sensor module to detect levels of moisture in the soil. If the moisture level is low, the submersible 5V pump pumps water from a source through the tubing into the plant. The soil moisture sensor then detects the moisture and the water stops pumping. The code is set up to perform checks every 12 hours on the moisture level in the soil.

The project does not make use of a relay module as the pump used worked well with low voltage. Some motors and pumps may not work so well under a low voltage in which case the use of a external power supply and relay is required.

EXPANDED TECHNICAL DETAILS

High-Efficiency MOSFET Irrigation

This project provides a silent and reliable plant watering system by replacing mechanical relays with modern semiconductor switches.

  • N-Channel MOSFET Bridge: Uses a logic-level MOSFET (e.g., IRLZ44N) to drive a 12V water pump. This eliminates the "Clicking" sound of relays and prevents the arcing/wear common in mechanical contacts.
  • Transistorized Soil Sensing: Captures soil moisture via a resistive or capacitive sensor. The Arduino uses a high-sensitivity analog comparison to trigger the pump only when the soil impedance reaches a specific threshold.

Efficiency

  • Soft-Start PWM: (Features) Gradually ramps the pump speed over 1 second using PWM, reducing mechanical stress on the plumbing and preventing "Splash" during the initial watering burst.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Plant watering system (without relay)"
description: "Have your plants water themselves when the soil moisture is low!"
author: "rhealv"
category: ""
tags:
  - "water plants"
  - "plants"
  - "garden"
views: 4286
likes: 0
price: 1499
difficulty: "Easy"
components:
  - "1x Male/Female Jumper Wires"
  - "1x Plastic Vinyl tubing"
  - "1x SparkFun Soil Moisture Sensor (with Screw Terminals)"
  - "1x Arduino UNO"
  - "1x Female/Female Jumper Wires"
  - "1x SUBMERSIBLE HORIZONTAL PUMP"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles: []
documentationLinks: []
passwordHash: "82dd5d9850c3a4fe5462b0b0c9326e10fbe8f09d470155b03d7ec85fdb34f7b5"
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seoDescription: "Learn to build a plant watering system without a relay. Automatic watering when soil moisture is low. Simple Arduino project for beginners."
videoLinks: []
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/plant-watering-system-without-relay-2af7bc_cover.jpg"
lang: "en"