Many apartment buildings still use a master-metered billing system where all tenants pay the same monthly amount regardless of their electricity usage, which means tenants are unaware of their daily consumption amounts and costs and can lead to overuse and unpaid bills. The system also incurs high costs for disconnections and reconnections of service due to non-payment. Switching to individual electric meters that track each tenant's usage could help tenants better understand and manage their electricity costs.

2. A number of apartments nowadays are still implementing a master – metered
form of billing in which the allocation of the payment is divided by the number of
apartment units. With this kind of set up, all consumers pay an exactly the same amount
regardless of consumer’s income, capability to pay and level of consumption. Thus, the
consumers are not aware of their daily consumption regarding the amount of electricity
usage and its associated equivalent monetary cost. This may probably result over
consumption of electricity leading to unpaid bills and debts. An added burden is the cost
of disconnections and reconnections which, basically, is high.

3. Input Process Output
KEY LCD
BUTTON
SENSOR PIC16F84A RELAY
[ROOM1] [ROOM1]
PIC16F877A
SENSOR PIC16F84A RELAY
[ROOM2] [ROOM2]
SENSOR RELAY
[ROOM3] PIC16F84A
[ROOM3]
COIN SLOT

4. Keypad
Pic to pic
simulation

5. Pic to pic
Electricity Level
simulation
Indicator
Main line
connector

6. ROOM 1
Electric Switch
Relay Meter
B
ROOM 2
Main
Breaker
Line Electric Switch
Relay Meter
B
ROOM 3
Electric Switch B
Relay Meter

7. COIN
Room SLOT
Numbers
OK Cancel
/Change
User
Interface
Balance
Start

8. • The developed coin slot prepayment system for household electricity can be a good
limiter for electricity usage because you can’t have electricity if you will not pay for it
first.
• The developed coin slot prepayment system for household electricity can give the
end user an accurate amount of electricity depending on the equivalent amount value
of money that is fed by the end user to the machine.
• The developed coin slot prepayment system for household electricity will help it’s
tenant in paying the electricity bills on time, since electricity is paid off before it is
used and the tenant can withdraw the money anytime from the machine.

9. • The developed coin slot prepayment system for household electricity will
improve if the future researcher will used Programmable Logic Controller
(PLC) in exchange of using Peripheral Interface Controller (PIC).
• For further research improvement, the coin slot prepayment system for
household electricity may be utilized for a larger number of rooms.
• The proponents recommend that a portable digital type of electric meter will
be used in counting the electricity consumption.