The development process is generally based on Morris Asimow’s principle as shown in figure 3.1 (Asimow, 1962).
Planning for Manufacture
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.
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... [continues]
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