CONSTRUCTION OF RAIN ALARM DETECTOR

CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY
The water alarm detector is a self-contained electronic device that sounds an alarm when its sensor is in contact with water. It can be used near water heaters, washing machines, sump pumps, bathtubs, toilets, dishwashers, and high-efficiency furnace pumps. Water alarms will detect leaks from toilets that have the potential to cause mold growth [1] O. J. Bedrij.
Slow leaks from appliances and plumbing fixtures often go unnoticed. Excess moisture and standing water from a slow leak can cause extensive damage to the floors and walls of your home. There is also the potential for mold growth. A water alarm detector will let you know if there is a moisture problem.
There are two types of water alarm detectors-passive and active. The passive detector uses a 9-volt battery. The moisture sensor is placed on the floor and activates the alarm when it becomes wet. Damp locations or high temperatures may reduce the life of the battery, so the detector should be checked regularly to see if it is working properly. These detectors can be purchased at most home improvement stores. [2] B. Ramkumar, H.M. Kittur, and P. M. Kannan.
Active water detector systems can operate an individual appliance or control the whole house. This system also generates an alarm, and it automatically shuts off the water supply. These systems are more costly than passive systems.
Since active water detectors may require special shut-off valves and electrical wiring, it is best to consult a professional to determine which system will meet your needs.
1.2 PROBLEM STATEMENT
People often forget to lift the suspension of clothing during the day which exposes their clothes to rain which makes their clothes to take longer time to dry. Most especially people who are working or doing business, they don’t worry about their clothes that have been dried outside. This device brings solution to this problem. This project develop for working couple or busy people, it gives an indicator of rain drop via alarm.
1.3 AIM AND OBJECTIVES OF THE PROJECT
It be will rain at any time without realizing it. Shirts in a clothesline outside the house that is almost dry to wet again if we are slow to lift it. This project will help the housewife or other users to alert more quickly when it rains. The sensor is able to detect even the slightest water and will sound an alarm when exposed to rain. The main objective to be achieved in this project is to produce an alarm to help users alert more quickly to avoid the presence of rain from wet shirt at clothesline outside the house. Sub objective that support the main objective are:
1) Complete the electrical circuit to detect the presence of rain
2) Complete the mechanical part of the model house
1.4 METHODOLOGY
BLOCK DIAGRAM OF THE SYSTEM
The block diagram of the system in fig 3.1 shows the link or interconnection between the basic blocks of the system. [3] T. Y. Ceiang and M. J. Hsiao.






1.5 SIGNIFICANCE OF THE PROJECT
A rain sensor is an automated device that shuts off your lawn irrigation system every time it rains. It is a relatively cheap device that can save up to 45 percent of your water bills, help protect the environment and conserve water.
A rain sensor is mounted outdoors away from trees and roof over hangs so that it can collect rainwater without obstruction. A rain sensor can either be wired or wirelessly attached into a lawn irrigation system. Below are the five advantages of using a rain sensor.
1. Conserve Water
There is a lot of water that you can save by using a rain sensor. By automatically turning off your lawn irrigation system every time it rains, the conserved water can be used in other essential purposes such as fighting fire.
2. Prevent Disease Damage and Nutrient Loss
A lawn irrigation system equipped with a rain sensor minimizes wasteful runoff such as pesticides, motor oil, fertilizer, pet waste and sediments from reaching your waterways. It also minimizes garden pollutants such as herbicides and fertilizers from getting into your groundwater system.
Over-watering prevent the roots of your plants from reaching deep into the ground making your plants vulnerable to disease. Over-watering is also one of the major cause of nutrient loss in plants as excessive watering washes away the nutrients of the soil leaving your plants weak and unhealthy.
3. Save Money on Fertilizer
A rain sensor prevents you from overwatering your plants and lawn. When a plant is overwatered, the nutrients from the turf wash away into the drainage system. You have to compensate by adding more fertilizers to your lawn and plants. This means spending more money on fertilizers. With a rain sensor that effectively prevents your lawn irrigation system from overwatering your lawn and plants, your garden turf will remain to be an ideal environment for your plants in accordance with the fertilizer that you are using. [4] J. M. Rabaey.
4. Increase the Life-span of your Irrigation System
Using a rain sensor prevents unnecessary wear and tear of your lawn irrigation system since it minimizes the amount of time that your lawn irrigation is in operation. This is especially useful during the rainy season where rain unpredictably come and go.
5. Prevent Groundwater and Waterways Pollution
APPLICATION OF THE PROJECT
Rain alarm is an application which detects the rain water and blows alarm. They are useful devices and play an important role in various industries such as automobile, irrigation, and wireless communication.
1.6 SCOPE OF THE PROJECT
This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The circuit draws virtually no current when the sensor is dry and the current consumption is low when the buzzer is activated. Alternately, a molded power supply with a simple voltage regulator to drop the voltage to 3 volts could be used. When the circuit is triggered, the buzzer is pulsed about once per second for a very short time, giving it a "dripping water" sound which seems appropriate.
1.7 REPORT OUTLINE
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis the project is organized sequentially as follows:
1. Chapter one of this work is basically the introduction to rain sensor. In this chapter; the background, motivation, aim, significance of study etc was discussed.
2. Chapter two was based on the literature review of rain alarm. In this chapter, all the literature relating to this work was surveyed.
3. Chapter three describes the methodology and the architectural aspect aspect of the rain sensor.
4. Chapter four itemizes the test analysis and results therein.
5. In Chapter five, the conclusion and recommendation of the work was given.
TYPES OF WATER ALARMS
It’s a full time job keeping your basement dry. Everyday threats include heavy rains, backed up sewage line, a leaky hose or even your neighbour emptying their pool. Sump pumps are perfect for removing pooling water, and a backup battery and pump system help create peace of mind. Even with a backup pump and battery system, failures happen.
It’s the water sensor and alarm system that act as your last line of defense; alerting you before disaster strikes. In this post we’ll explore four different options of water alarms: the standard alarm, the phone dialler (or auto-dialler) alarm, the Wi-Fi enabled alarm, and the cellular sump pump alarm.
Standard Sump Pump Alarm. The most cost-effective solution on the list is this group of sump pump alarms. They are very simple and have a limited feature set. For the user, just set the device on the floor and when water is sensed the alarm will sound. Some standard alarms work via battery power, some via a wall outlet, and some offer a wall plug with battery backup.
Pros: very affordable, easy setup, great if you’re going to be in close proximity of the unit to hear it.
Cons: rely on proximity, if you’re not close or can’t hear the alarm then you’re not being warned. Cheaper units use low quality parts that may rust overtime, rendering them useless.
Phone or Auto Dialer Sump Pump Alarm. The auto dialer alarm works much like the standard pump alarm; when water is sensed the device sounds an audible alarm. The auto dialer has an added feature though; it can make a call out to your phone to warn you of the alarm. The only way the call out feature works is when a phone line is present at the device, this could mean installing a line in the basement or having to run service to your home if you only use a cell phone for phone service, which is rather common these days.
Also, if there is a lightning strike, the surge will come in thru the unshielded phone wire and take-out the dialer. You usually don’t know it happened until you need the dialer, and it does not work. Also, sometimes dialers will not hang-up the phone line, disabling all the phones in your house. If this happened during an emergency, people calling your house will get a busy signal, and you have no idea what is happening;
Pros: calls to send alerts rather than just sounding an alarm, ensures you know there is a problem.
Cons: can run rather expensive at prices near, could be difficult to install if you do not already have a phone line running to your sump pump, could cost you long distance depending on where you’re calling, may be rendered useless by lightning, may not hang up and jam up your outgoing phone connection.
WiFi Auto Dialler Water Alarm. The solution for installing a phone line is the Wi-Fi based sump pump alarm. The solution works just like the Auto Dialler in that the device will call you when it senses water. The one perk is that you can connect to your local wireless network and it will use VOIP (Voice Over Internet Protocol) to send the call. Some of these devices also allow remote data monitoring and the sending of emails or SMS messages.
If you do not have a wireless router or internet connection, then this will not be the right solution for your use. Also, unless your cable router and Wi-Fi access point are backed-up on a UPS (uninterruptible power supply), your Wi-Fi access point will be powered off during a power-fail event and will not be able to notify you of an alarm.
Pros: added features since it’s an internet connected device, no need to run phone lines to the alarm
Cons: rather expensive with most systems starting at greater than $300, could be difficult to install if you’re not familiar with wireless networks, must have a wireless internet connection for this system to work, must have a UPS system or you won’t receive notifications when power is lost to your home Oyubu A.O, (2017) [1].
Cellular Sump Water Alarm. These are the newest devices on the market and work like the standard sump pump alarm and sound an alarm when water is sensed. Since they are cellular based they have text messaging built in and send out a message when the water sensor touches water. These devices do not require a phone line or wireless internet connection to work, but do generally require a cell service plan. Some cellular water alarms come bundled with the cellular card and are truly plug-in-play, others require a separate cell phone or dedicated-pre-pay phone that connects to the unit, making it a little more difficult to setup. Cellular water alarms are the easiest to install systems that offer their particular features [5] J. M. Rabaey. They install like a standard pump alarm but offer the features of more robust and harder to install systems.
Pros: easy to install, very cost effective, offer two notifications in the form of an audible alarm and a text message.
Cons: require cell service which is available just about everywhere but some spots do not get coverage. Choose the Right Technology. In the end, it does matter what technology you use. You’ll want water alarm that:
Alerts you no matter where you are, because leaks and floods can happen any time of day or night.sends messages when the power goes, as power is regularly knocked out during a storm.
sends notifications direct to your mobile device, so you can take immediate action to prevent a flood.

References
[1] O. J. Bedrij, “Carry-select adder,” IRE Trans. Electron. Comput, pp. 340–344, 1962.
[2] B. Ramkumar, H.M. Kittur, and P. M. Kannan, “ASIC implementation of modified faster carry save adder,” Eur. J. Sci. Res., vol. 42, no. 1, pp.53–58, 2010. [3] T. Y. Ceiang and M. J. Hsiao, “Carry-select adder using single ripple carry adder,” Electron. Lett., vol. 34, no. 22, pp. 2101–2103, Oct. 1998.
[4] J. M. Rabaey, Digtal Integrated Circuits— A Design Perspective Upper Saddle River, NJ: Prentice-Hall, 2001
[5] J. M. Rabaey, Digtal Integrated Circuits— A Design Perspective Upper Saddle River, NJ: Prentice-Hall, 2001.
 
CHAPTER TWO
LITERATURE REVIEW
2.1 THEORIES OF RELATED WORK
A rain sensor is a rainfall triggered device. Some applications of rain sensors are; first, connecting the device to automatic irrigation system to make the system shut down by sensing rain drop. The second is a device used to shield the interior of automobiles from rain and to support the automatic mode of windscreen wipers. An additional application in professional satellite communications, antennas are used to trigger a rain blower on the aperture of the antenna feed to remove water droplets from the Mylar cover that keeps pressurized and dry air inside the wave-guides.
Rain sensors for irrigation systems are available in both wireless and hard-wired versions most employing hygroscopic disks that swell in the presence of rain and shrink back down again as they dry out — an electrical switch is in turn depressed or released by the hygroscopic disk stack and the rate of drying is typically adjusted by controlling the ventilation reaching the stack. However, some electrical type sensors are also marketed that use tipping bucket or conductance type probes
to measure rainfall [6] Y. He, C. H. Chang, and J. Gu. Wireless and wired versions both use similar mechanisms to temporarily suspend watering by the irrigation controller — specifically, they are connected to the irrigation controller's sensor 1011 terminals or installed in series with the solenoid valve common circuit such that they stop the valve from opening when rain has been sensedsense.
Where irrigation systems are still used over the winter, some irrigation rain sensors also contain a freeze sensor to keep the system from operating in freezing temperatures.
HISTORICAL OVERVIEW OF RAIN SENSING DEVICES
One of the oldest type of rain sensor still in use today has a water collecting basin that performs the work of a rain guage [7] Cadence. Once the basin collects a pre-set amount of water, the weight of the water trips a switch and triggers the irrigation system off. The challenge with this type of rain sensor is that the basin doesn't discriminate between rain and debris which can fill the container and interrupt the watering cycle untimely. Some of the wider basin types allow wind to blow rain water out of the container which delays the shut-off. [8] Oyubu A.O, (2017). Conductivity is the principle of the second generation of rain sensor. Two electrodes are positioned a certain distance from the bottom of the basin. When the water level reaches the electrodes, a circuit is completed and the switch is triggered. The weight of debris will not trigger the switch but displaces water causing the untimely switching of the trip during a brief shower.
The open container is the liability with either of the first two rain sensor types.
The third and currently most popular sensor discards the old catch basin. A hygroscopic disk made of a synthetic material similar to cork expands when it gets wet. The more it gets, the more it expands. The expanded disk triggers the switch after a preset amount of rain has fallen. There is a continuous expansion as more rain fall. Until the disk dries out and returns to normal size, the system will not resume schedule. The sensor keeps preventing water as more rain fall.

    Date: 2026-08-02 00:00:00.000000