Download Microcontroller Based Self-Maintained Aquarium Using PIC16F877

A solenoid valve is a general purpose, one input, one output, two state
(open/close) solenoid valve that runs on 220V. It was used as a control
component for the input of water. It was controlled by a relay that accepts a 6V
from the microcontroller to route the power source of the valve. Solenoid valve
will be deactivated by the float switch if the lower float switch gives a high value.
The valve starts refilling the aquarium as expected.
Relay – SPDT
Furthermore, the relay that the researchers used is a single push double
throw variety. It will accept a 6V DC of input and will output a 220V AC. Relays
were used to activate the solenoid valve, filter, pump and florescent lamp for
they only run on 220V.
The SPDT relay acts as a switch for the feeder motor and dechlorination
motor. As soon as the microcontroller gives the signal to activate the function, It
transfers the 220 volts needed to activate these motors. Refer to Appendix F for
the figure.
Float Switch
The float switch closes or opens its circuitry depending on the water level.
Two float switches were used; one for controlling the draining of water and the
other for controlling the pouring of water into the aquarium.
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