Combine two types of Circuits of a common purpose

[reinaldo]

Hey Everybody!...i want to "combine" or "Mash up" a Design that I did with a design i found on the internet!...It is a Distance meter by Ultrasound!...in my circuit i used PIC16F88 to control a LCD screen
wich showed me the distance in %...and it had two setpoints!...one low and one high!...if it reaches the low point it triggers a buzzer, and vicecersa...i design it for to mantain a distance between a range!...

Soo...what is my problem...i want to control a water tank in the back of my house...but i want to be able to see the display from a not too far distance...so i want to change the LCD display for a 3 digit 10mm Height 7 segment display!...the buzzer system i want to change it for a much louder buzzer so i can hear it from inside the house, and for the "buzzer alarm" system also i want to add two light bulbs of 60W...one Red for Low level and one Green for high level...so how do i make the power alarm system couple to the digital circuit??...optocouplers??...how??...and how do i change the LCD
for the 7 segment display??...im using the LV-MaxSonar-EZ1 ultrasonic transducer!...

in conclusion...i found on the internet two circuits diagrams that uses the 7 segment displays but no alarms...and they used different ultrasonic transducer...im new at digital electronics so i want to mantain my original circuit diargram with my transducer but with the 7 segment display and the alarms system much more louder and with the indicatived lamps red and green!

I appreciate so much what you can do!...

this are the internet links for the other two circuits!


http://www.best-microcontroller-proj...pic-sonar.html

http://hobby_elec.piclist.com/e_pic6_6.htm

 

[reinaldo]

Here is a pretty rough scheme of what I am doing and need...Merry Christmas and Happy new year!