it's a small Mechatronics Project which shows how to program a mixer and heater to work together in one tank.

1. Faculty of Engineering
Mechatronics Department
Design Of Mechatronics Project
Supervisor : Dr. Khalid AL-Wedyan
2007 -2008

2. Team WorkTeam Work

3. What is the heating and mixing
tank
The mixing and heating system is
a simple system which consists
of 3-tanks, two of these tanks
contain different fluids to be
mixed and the third big tank
which is called the mixing tank
(the processing tank) contains
two level sensors to determine
the lower and upper level, it
also contains the heater and the
mixer.

4. The Basic System
The heating and Mixing tank is
formed form three basic
system :
1- Fluid System
2- Thermal System
3 – Electrical system

5. Fluid system
The fluid system contains two
basic elements :
1- Tanks :
a – tow storing tanks .
b – one processing tank.
c- products tank .
2 – Solenoid valve :
We have three solenoid valves
Two in storing tanks and one in
the processing tank.

6. Tanks
 We have in our project four tanks which we
use it for many purposes which are :
 To store the unprocessed liquids (two
tanks ) , where we want to put the tow liquid
that we want to processed it.
 The process room , where the two liquids will
mixing and heating and this tank is the
biggest tank and we connect to this tank the
heater , DC motor for mixing , and two level
sensors .
 The product tank used to store the final
product form the process

7. Solenoids valve
What means of the solenoids valve ?
The solenoids valve is a kind of valve but its
activated by electrical signal
How we connect the solenoid valve ?
We connect it normally closed and when the
signal games to it he will change its state to be
open so the liquid will flow through it until the
signal its stop .

8. Thermal system
In our project the heater is
the thermal system and
the heat will flow from
the heater to the mixture
liquid .
The maximum temperature
that the heater achieve is
35 C

9. The heater works when a high
signal actuates the relay this
will close the circuit of the
heater and allow the current
to flow .

10. Electrical system

11. PIC16f877A
A microcontroller is an
amazingly useful
device. Akin to a very
specialized CPU, a
microcontroller is
small, consumes little
power, and can be
programmed to
quickly and reliably
perform a wide variety
of tasks.

12. PIC 16F877A

13. PIC16f877A
we chose the PIC16F877A because of the following reasons:
It comes in a 40 pin DIP pin out and it has many internal
peripherals.
The 40 pins make it easier to use the peripherals as the
functions are spread out over the pins. This makes it easier to
decide what external devices to attach without worrying too
much if there enough pins to do the job.
Each pin is only shared between two or three functions so it's
easier to decide what the pin function (other devices have up
to 5 functions for a pin).

14. Regulator
A linear voltage regulated power supply requires an unregulated
voltage that’s higher than the desired regulated voltage. For
example, a 12 V power supply can supply power to a linear
voltage regulator that outputs 5 V.
Linear voltage regulators are popular for the following uses:
Quick, small, simple circuits.
Low cost, high volume products, such as inexpensive
consumer electronics.
Circuits that consumes small amounts (100 mA or less) of
current.
Regulated voltage that just slightly less than the unregulated
voltage.

15. Relay
When the signal receive from the pic the relay will change from
it state this mean change from normally open to normally
closed and the normally closed to normally open .
And in our project we connect it as normally open with the
directional valve so when the signal came from the pic the
relay became to normally closed so the signal reached the
directional solenoid valve so the valve change it state to be
open

16. The Mixer
We use a DC motor as mixer
 the speed of the DC motor
is decrease as the torque
increase and so when we but
in the liquid its speed will
decrease.
Its take when it loaded
maximum voltage 24V and
maximum current 5A

17. Sensors
We use in our project a tow
level sensor to indicate the
level of the liquid .
 We put the tow sensor in
the processing tank one it
the bottom of the tank and
the other one in the upper of
the tank .
The sensor in the bottom of
the tank tell us if the tank is
fully empty or not .

18. Sensors
The upper sensor tell us if
the liquid arrive the higher
point the we want the
liquid to arrive .
If the liquid arrive the
upper sensor the flowing
the liquid from the tow
storing tanks will be stop

19. The project circuit

20. Parts list
4 tanks
3 solenoid
Heater
DC motor
Regulator
Relay
PIC 16F877A
2 level sensor
Bread board
Transistor
Power supply

21. Question ????????

22. THE END