1. 張人方1 許哲維1 徐合邦2 鄭泗東3
1Department of Mechanical Engineering
2Department of Electrical and Computer Engineering
3ProfessorDepartment of Mechanical Engineering
National Chao Tung University, Hsinchu, Taiwan

2. Alarm
System
Sick
bed
Patient
button
Security Calling
Intravenous Drip

3.  To construct a new intravenous drip monitor
device.
 To activate an alarm system when capacity of
an intravenous drip is lower than 50 c.c.
 To install a button for patients to press on
emergency.

4.  First, to utilize a ceramic buzzer as an audio
alarm.
 Second, write a program for 8051 as a central
processor to receive the signal from optic
sensor when capacity is lower then 50 c.c.
 Third, to verify the button function for patients.
 Last, to confirm the capacity displayed by digits
on display with the remaining capacity whether
correct or not.

5. Capacity Setup:
 Digits setup
(thousand, hundred
tens, unit)
 Numbers
R : Clear
E : Enter and Display

6. 1st LED：Fluid setup
2nd LED：Capacity setup
3rd LED：Start program
4th LED：Start counting
after five drips.
7th LED：Alarm
activated

7. Output and input devices arrangement
1. Button “E”, to enter command
To accept setups
• Selection type of fluid
• Pressing “ E” to display default value 0 5 0 0
• To input capacity(c.c.) with arrow buttons
• The range of capacity 0000~9999 c.c.
• To start running with button“ E”
2. Button “E”, to switch from different displaying
options for manual tuning reference
• To display the remaining capacity in 4-digit
• To display the terminate time in 24 hours format
HH.MM

8. INITIAL
CAPACITY
GET INPUT
UPDATE
DATA
DISPLAY
CAPACITY
C
DISPLAY
TIME
TDisplay
bottom

9. START
INITIAL
１click
active
RETI
4click
deactive

10. START
INITIAL
Countdown
60 drips
RETI
CAP SUBB
1cc

11. START
INITIAL
3 bytes for ticks
3 bytes for clocks
RETI
Count ticks
Count clocks

12. START
INITIALIZE
FLUID TYPE
FLUID CAPACITY
RETI

14. The sum of deltas
4
The average
Interval x (capability*60+Drops) x (A) x 1/60
(A)
Get from timer0

15.  Function: 1 click to activate, 4 clicks to
deactivate alarm buzzer
(Patient button.mp4)

17. AND
Gate
555TIMER IC
8051
Buzzer

19. 440
390
331
280
228
177
126
82
44
190
100
200
300
400
500
0 20 40 60 80 100
Remainingcapacity(ml)
Time (min)
Initial capacity:440ml
Terminate time:90 min
Sodium chloride solution

20. 0
20
40
60
80
100
120
140
160
180
200
0 20 40 60 80 100
Sodium chloride solution
Displayingtime(min)
Real time (min)
Initial capacity:440ml
Terminate time:90 min

21.  Test results show displayed capacity is
predictable with small error by comparing the
displaying capacity and real capacity.
 For twofold displaying time to real time, the
causes can be tuned in the program by
changing the parameter for 8051.

22.  In this project from medical center, I learned
how to organize the team.
 I practiced how to program 8051 central
processor unit and debug the errors.
 I also find out the utilization of logic circuit in
auxiliary design with 555 chip.