Flood Monitoring System

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Chapter III
Methodology

The development process is generally based on Morris Asimow’s principle as shown in figure 3.1 (Asimow, 1962). Concept
Embodiment
Design
Detailed Design
Planning for Manufacture
Testing

Figure 3.1 Methodology block diagram

Based on the summarized chronological development process by Asimow’s principle shown above. The researchers propose a technical solution to the problem that presented in the following logical order: (1) the Hardware Description, (2) the Firmware Flow and (3) the Test Process. Hardware Description

Firmware Flow
Test Process

Figure 3.1 Development process

3.1. Hardware Description

Figure 3.3 shows the flow of the system when water is detected. The whole unit is turned off when there is no flood detected, this can conserve power. When the water detected through the use of float switch that is located at the lower end of the stand, the whole unit will turn on. The ultrasonic sensor automatically measures the water level every 3 (three) minutes (the 3 (three) minutes intervals helps the system to conserve power) and delivers the data to the microcontroller. The microcontroller forwards the data to the GSM module, the module will process the data into an SMS message and sending it to the programmed authorized recipient’s cellular phone thru its subscriber identity module (SIM) card number. Dissemination of flood level information is therefore completed. Furthermore, the researchers use two microcontrollers, one for ultrasonic ranger and for sending the data to GSM module and the second microcontroller used to act as an RTC or Real Time Clock. When the second microcontroller count reaches to 28800 seconds or 8 hours, the second microcontroller automatically send pulse to the relay so that the GSM module and the first microcontroller will activated and also the second microcontroller send pulse to the one of the pins of the first microcontroller. If the first microcontroller detects one of the pins of first microcontroller is high, the first microcontroller send “FLOOD MONITORING SYSTEM STATUS: Operational/Ok” to the GSM module and the GSM module will send the data to the program authorized recipients. This process makes sure that the system is working without detecting flood.

a.

Microcontroller
unit
GSM Module
with SIM card
PCB with voltage regulators and components
RTC circuit
Weather Proof
Outdoor Enclosure
with stand
c.

Float Switch
Ultrasonic Ranger
Battery Pack
b.

Figure 3.3 Product Design
Existing GSM Network
Figure 3.4 (a) shows the block diagram of the system. The float switch activates the entire system when the water is detected. The ultrasonic ranger circuit automatically measures the water level in every 3 minutes which is controlled by the microcontroller. The microcontroller unit transmit the measured water level data to the GSM module. The GSM module will process the measured water level data into an SMS message and transmit the data to the existing GSM network. The GSM network will transmit the data to the mobile phones of the concerned citizens; (b) shows the RTC circuit activates the system and the microcontroller will send an SMS message of “FLOOD MONITORING SYSTEM STATUS: Operational/Ok”. This process repeats every 8 hours. a.

Microcontroller
Unit
Ultrasonic Ranger Circuit
GSM Modem with SIM Card

Float switch
Battery Pack
Voltage Regulator
Mobile Phone

Existing GSM Network

Voltage Regulator
GSM Modem with SIM Card
b.

Mobile Phone

Microcontroller
Unit
Relay

Battery Pack

RTC Circuit

Figure 3.4 Hardware Block Diagram
3.1.1 Float Switch
Figure 3.5 Float Switch
The float switch that is located at the lower end of the stand serves as switch and a detector. Through the use of float switch that will activate the entire system only, when there is water detected. This process can conserve the power of the battery.

The researchers plan to use PLS-031A-3 miniature level...
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