IMPLEMENTATION OF SOLAR WATER PUMP CONTROLLED WITH FOUR DIFFERENT TIMES FOR POWER SAVING APPLICATIONS

Abstract

Form olden days we are using non renewable sources of energy in excess mount for our needs. As this
type of minerals like coal etc are exhausting so we have to depend on the renewable sources of energy like solar, wind,
etc. For smaller application it is better to use renewable energy. As this project is based on streetlight automation and
required Ac supply. So for this particular application we are using solar panels to charge the DC battery and the power
from the battery can be used for this application. This project is an innovative solution to operate a machine / motor /
liquid pumps for a small duration. If a machine is to be operated for ten minutes, and should be switched off after the
duration, it is too difficult and many times we forget to switch it off the system after the prescribed time. This project
provides the facility of automatic switch off after the requited time duration. This is achieved by using the MCU. Four
push-to-on switches are connected to one port of the microcontroller. These four switches are to provide four different
fixed time constants.
A 16X2 LCD is connected to the microcontroller to display the status of the pump. Contrast of the LCD can adjust by
using a preset which is connected to it.
A transistor is used to drive the relay during the active time period. 5V double pole - double through relay is used to
control the AC liquid pump. LED indication is provided for visual identification of the relay / load status. A switching
diode is connected across the relay to neutralize the reverse EMF.