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AUTOMATIC HOTEL CHECK-IN AND OUT SYSTEM
Group 31
Design Review
ECE 445
September 26, 2015
Tianyuan Feng
Tingting Dang
Yuncong Hao
TA: Cara Yang
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Table of content
1. Introduction
1.1 Statement of Purpose
1.2 Objectives
1.2.1 Goals & Benefits
1.2.2 Functions & Features
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2. Design
2.1 Block Diagrams
2.2 Block Descriptions and Schematics
2.2.1 Overall Summary
2.2.2 User Interface
2.2.3 Microcontroller Module
2.2.4 Keypad Module
2.2.5 Speaker Module
2.2.6 Motor Module
2.2.7 LED Module
2.2.8 Power Module
2.3 Schematics of Overall System and Simulation
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3. Requirements and Verification
3.1 Requirements & Verifications
3.1.1 Requirements Summary
3.1.2 Verifications Summary
3.1.3 Microcontroller Module
3.1.4 Keypad Module
3.1.5 Speaker Module
3.1.6 Motor Module
3.1.7 LED Module
3.1.8 Power Module
3.2 Tolerance analysis
3.3 Ethical Issues
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4. Cost and Schedule
4.1 Cost Analysis
4.4.1 Labor
4.4.2 Parts
4.4.3 Grand Total
4.2 Schedule
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Reference
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1.0 Introduction
1.1 Statement of Purpose
Traditionally, travelers have to go to front desk to do check-in and check-out process at
hotel, which means hotels will need to pay extra money for hiring front desk employees
for long working hours. Besides, it will increase the waiting time for travelers to get
checked in especially during busy hours. Our project aims to solve this problem with an
automatic hotel check-in and check-out system. Comparing to high cost automatic checkin system on market, our project will largely decrease the implementation cost budget in
order to save money for hotels while save waiting time for travelers.
1.2 Objectives
1.2.1 Goals & Benefits:
• Automatic check in and check out system with no need of front desk employees
• Reduce hotel costs by hiring less employees working at front desk
• Reduce guests waiting time to get checked-in
1.2.2 Functions & Features:
• Wireless communicate between lock and PC
• Input key code verification between PC and lock
• Keypad for user input
• Red LED light when entering wrong key input
• Green LED light when entering correct key input
• Beeping sound performing with wrong key input
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2.0 Design
2.1 Block Diagrams
As shown in Figure 1, the PC, which is the main controller and database, connects to the
check-in/out terminal and locks. Inside the lock, there is a controller, which accepts
keypad input, sent out signal to LED, speaker, and motor. There are a power source to
supply the controller and motor.
Figure 1. Block diagram of design
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2.2 Block Descriptions
a. User Interface
The check-in/put terminal and the PC are the user interface, which is a pure program.
Any PC, tablets are suitable for this part.
b. Micro-controller Module
This module is the “brain” of the entire circuit which is powered by our power unit.
Micro-controller sends signal to and receives signal from PC through WIFI. It will get
key input from keypad, and matching the input with the command and data it receives
from PC. Then it will send out control signals to LED module, speaker module and motor
module.
c. Keypad Module
Keypad is the input unit to the micro-controller, which collects key strokes from the user.
It sends out the key input data from our user to our micro-controller to do data
processing.
d. Speaker Module
The speaker gives out notify signals, such as correct passcode, wrong passcode and
lower power. The speaker should be small and less power consumption.
e. Motor Module
Motor is the unit to actual open the lock, which drives the mechanism to open the door
controlled by the controller.
f. LED Module
LED is the indicator of the circuit, which tell the correctness of the passcode.
g. Power Module
Power unit is a 12 voltage long term battery, which provides different voltage level to
each module in the circuit via different voltage regulators.
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2.3 Module Circuit & Simulation Result
a.User Interface:
The user interface implementation is pure software programming, software flow chart for
this is attached below:
b. Microcontroller Module
Because of the special need of the WIFI connection, Taxes Instrument SimpleLink Wi-Fi
CC3200 LaunchPad suits for this project. Taxes Instrument SimpleLink Wi-Fi CC3200
LaunchPad has a CC3200 chip, which is the industry's first single-chip Microcontroller
with built-in Wi-Fi connectivity for the LaunchPad™ ecosystem. CC3200 LaunchPad
communicate with PC through the on-board antenna, and use the on-board M4 processor
to run the program stored in the on-board flash memory. The board has 11 general
purpose input/output ports, which can read and send signals through. Figure 1 shows a
photo of the CC3200 LaunchPad.with pin layout.
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P1
P3
Dev Dev
Pin# Pin# Signal
Ref Signal
1 3.3V
5V
2 ADC_CH1
58
GND
3 UART0_RX
4
57 ADC_CH0
4 UART0_TX
3
60 ADC_CH3
5 GPIO
61 58* ADC_CH1
6 ADC_CH2
59 59* ADC_CH2
7
8
9
10
SPI_CLK
GPIO
I2C_SCL
I2C_SDA
5
62
1
2
63
53
64
50
AUD_SYNC
AUD_CLK
AUD_DOUT
AUD_DIN
P4
P2
Dev Dev
Signal
Re
PWM
2* Pin# Signal
GND
1
Pin#
PWM
1* 18 GPIO
2
PWM
17* 8 SPI_CS
3
PWM
64* 45 GPIO
4
CCAP/GPIO 21*
RESET_OUT 5
CCAP/GPIO 18* 7 SPI_DOUT 6
GPIO
62* 6 SPI_DIN
7
GPIO
60* 21 GPIO
8
GPIO
16 55 GPIO
9
GPIO
17 15 GPIO
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Fig1. CC3200 LaunchPad EVM Overview with pin layout
In this project, 7 GPIO on the board will be used to read data from keypad. 1 GPIO will
be used to signify the motor module, LED module, speaker module. Based on the data
sheet, the power range for this board is from 2.1V to 3.8V, and the recommended voltage
is 3.3V. The electronic characteristic is shown below at voltage supply=3.3V and
temperature= 25°C.
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GPIO Pins Except 29, 30, 45, 50, 52, and 53 (25°C)
PARAMETER
CIN
Pin capacitance
VIH
High-level input
voltage
Low-level input
VIL
IIH
IIL
VOH
VOL
IOH
IOL
voltage
High-level input
Low-level
input
current
current
High-level
output
voltage (VDD =
3.0 V)
Low-level output
voltage (VDD =
3.0 V)
Highlevel
source
current,
VOH =
2.4
TEST
CONDITIONS
MIN
NOM
MAX
4
0.65
×
–0.5
VDD
pF
VDD +
0.5
0.35V×
5
5
UNIT
VDD
2.4
V
V
nA
nA
V
0.4
V
2-mA
Drive
4-mA
Drive
2
mA
4
mA
6-mA
Drive
6
mA
Low2-mA
level
Drive
sink
current,
VOL = 0.4 4-mA
Drive
2
mA
4
mA
6-mA
Drive
6
mA
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GPIO Pins 29, 30, 45, 50, 52, and 53 (25°C)
PARAMETER
CIN
VIH
Pin capacitance
High-level input
VIL voltage
Low-level input
IIH
High-level
input
voltage
IIL
Low-level
input
current
VOH High-level
current
output
voltage
(VDD= 3.0
V)
VOL Low-level
output
voltage
(VDD= 3.0
V)
IOH
IOL
VIL
Highlevel
source
current,
VOH =
2.4
Lowlevel
sink
current,
VOL =
0.4
nRESET
TEST
CONDITIONS
MIN
NOM
MAX UNIT
7
0.65
×–0.5
VDD
VDD
+0.35
0.5V
×
50
50
VDD
2.4
0.4
pF
V
V
nA
nA
V
V
2-mA
4-mA
Drive
6-mA
Drive
Drive
1.5
2.5
3.5
mA
mA
mA
2-mA
4-mA
Drive
6-mA
Drive
Drive
1.5
2.5
3.5
mA
mA
mA
0.6
V
The flowchart for implementing the software of the microcontroller is attached below:
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Fig2. Microcontroller software implementation flow chart
c. Keypad Module
The Automatic Hotel Check-in and out system will use a 3×4 keypad as the input device
of the door. When guests entering their passcode, the keypad sends the password signal to
the microcontroller, and then send to PC for verification. There are 7 pins on the keypad
board, which are connected to the microcontroller directly. The table below shows the
code for each key on the keypad.
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Figure3. Codes for the keypad (Grayhill’s series 96 keypad handbook, p.8)
Note: Dots in the chart indicate connected terminals when switch is closed. Terminals are
identified on the keyboard.
d. Speaker Module
Speaker takes the output from micro-controller as control signal. When the input key
from the user didn’t match the key assigned from the front desk, the speaker gives out
beeping sound as a reminder. The connecting circuit of our speaker circuit is attached
below:
Fig4. Speaker connection Circuit
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e. Motor Module
Motor, lock style solenoid, is the physical unit to open the lock. Solenoids of the locker
are basically electromagnets: they are made of a big coil of copper wire with an armature
(a slug of metal) in the middle. When the coil is energized, the slug is pulled into the
center of the coil. This makes the solenoid able to pull from one end. Normally the lock is
active so you can't open the door because the solenoid slug is in the way. Based on the
data sheet, when 9-12V is applied, the door can be opened. The lock is designed for 1-10
seconds long activation time. The lock style solenoid is controlled by the output signal
from microcontroller. The circuit for this module is shown below. When the input key
code matches the data in the database, the controller sends out a high voltage from
microcontroller to the base gate of the transistor. Thus, the circuit of solenoid is closed,
and the voltage applies to solenoid. The door can be open.
According to the datasheet of our lock, it requires large amount of current (600mA –
1200mA) to go through in order to open the lock. Our simulation shows that under a
higher control signal within the range of 3-5 V, the current goes through is always
beyond 600mA to get the lock open which meets our implementation requirements.
The simulation diagram and connecting circuit is shown below:
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Fig5. Motor connection circuit
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Fig6. Motor current output result
f. LED Module
The lock use a Bi-color LED to indicate the status of the locker in the door. These show
one color (red) when the password is wrong so the door is still locked and another color
(green) when the password is correct so the door is unlocked. The control signal which
deciding the color of the LED is coming from the micro-controller. The graph below
shows the circuit for this module.
Fig7. Control circuit of the Bi-color LED
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Transistor T1 and T2 is used here as switch, driving the one half of Bi-color LED each in
order to show the result come from the microcontroller. The transistor T1 stops
conducting due to lack of forward bias. At the same time transistor T2 takes base bias
voltage from the battery through resistor R1 and conducts. This allows the red half of
bicolor LED1 to illuminate. Transistor T1 conducts when the positive voltage through
resistor R3 is given to base of transistor T1and light up the green half of LED1. In
conduction of transistor T1 transistor T2 turns off and vice-versa. Thus, when the logic
from the microcontroller unit is high, the Bi-color LED is in green, when the logic from
the Micro-control unit is low, the Bi-color LED is in red.
e. Power Module
The entire circuit inside the lock is powered by a 12V long-term battery. However, the
requirement of the value of voltage for each device in our system is variable, so the
DC/DC voltage regulator will be installed in the power circuit to step down the 12V
voltage to the specific voltage. The ground line of the different values of voltages should
be made common.
Specifically, here are the power requirements for each component in the system:
Devices
Voltages
CC3200 LaunchPad
3.3V
Lock style solenoid
12V (9V - 12V)
Bi-color LED
5V
Speaker
5V (3V - 7V)
The power supply for the motor module is directly come from the 12V long-term battery.
The voltage will be stepped down to 5V by the regulator circuit in order to supply the
power to Bi-color LED and Speaker. Furthermore, the voltage will be stepped down to
3.3V by the regulator circuit in order to supply the power to Micro-controller. The
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regulator circuit contains LM78XX series regulator and two capacitors. Below is the
circuit of the power circuit.
Fig8. Fixed-Output Regulator (Fairchild’s LM78XX/LM78XXA handbook, p.19)
3. Requirements and Verification
3.1 Requirements & Verifications
Requirement
Verification
Points
1. CC3300 LaunchPad
1. CC3300 LaunchPad
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1) Power: Vdd=+3.3 ±0.5 V
1) Connect CC3300 LaunchPad to
power, use multimeter to measure the
voltage difference between the positive
2) Should connect to WIFI
probe and negative probe of the source
3) Output low voltage should less than on the board. If the voltage difference is
within 2.8 to 3.8, the LaunchPad works.
0.4V
3) Output high voltage should greater
than 2.4V
2) Use the sample program provided to
test the WIFI function of the board ( refer
to the chip manuel)
3) Use the sample program provided to
pull up the GPIO of the board ( refer to
the chip manuel), then use multimeter to
measure the voltage difference between
the each GPIO and the ground probe on
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board. If the GPIO voltage is greater than
2.4, the GPIO works correctly.
4) Use the sample program provided to
pull up the GPIO of the board ( refer to
the chip manuel), then use multimeter to
measure the voltage difference between
the each GPIO and the ground probe on
board. If the GPIO voltage is greater than
2.4, the GPIO works correctly.
2. Keypad
2. Keypad
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1) Output low voltage should less than 1) Press one key at a time. Measure the
0.35V
output voltage of the 7 pins (positive
probe at the pin, and the negative probe
2) Output high voltage should greater at ground on board), and check with the
expected value referring to the keypad
than 0.65V
datasheet. The logic-0 voltage should
less than 0.35 V. The logic-1 voltage
should greater than 0.65 V.
2) Repeat the step for each key button.
3. LED
3. LED
1) Blue diode lit when output low
voltage at logic-1(greater than 2.4V)
1) Give the LED a voltage of 2.4V,
observe the lightening, if the green lit up,
it works fine.
2) Red diode lit when output low
voltage at logic-0 (less than 0.4V)
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2) Give the LED a voltage of 0.4V,
observe the lightening, if the red lit up, it
works fine.to the data sheet.
4. Speaker
4. Speaker
1) Current go through Speaker should
be with the range of 22+/- 5 mA.
1) Connect the speaker circuit as shown
before in the circuit and simulation
section. Apply DC voltage at 5 +/- 1V at
the gate and use current meter measure
the current at Q1 to make sure it's within
the current range.
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5. Motor
5. Motor
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1) Current go through Motor should be 1) Connect the motor circuit as shown
within 600mA to 900 mA for it to gets before in the circuit and simulation
open.
section. Apply DC voltage at 5 +/-1 V at
the gate and use current meter measure
the current go into the lock to make sure
it's within the voltage range.
6. Power
6. Power
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1) Supply 5V +/-0.25V at a minimum of 1) Place Digital Multimeter in parallel
1A +/- 0.25A.
with the power source. Measure the
voltage difference across the power
source. The voltage should read 5V +/0.25V
2) Place Digital Multimeter in series with
the power source and heating elements.
Measure the current difference from the
power source. The current should read
1A +/- 0.25A
3.2 Tolerance Analysis
Our motor module and speaker module is controlled by the transistor driven control
signal from our control unit. To make sure that there will be gate voltage around 3-5V at
the MOSFET gate to turn on the switch in order to have enough current go through the
lock (600mA-1200mA) and the speaker (25 +/-1 mA) to realize their functionality, we
need to make sure that there is stable control signal sending from our microcontroller.
From our research we found that the output signal from our microcontroller is within
5V+/- 25mV, which meets our requirements.
And our microcontroller module requires stable power 5V supply input to drive. Our
voltage regulator gives out supplying voltage at 5V +/- 0.25 V which also meets the
requirements.
3.3 Ethical Issues
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1. To accept responsibility in making decisions consistent with the safety, health,
and welfare of the public, and to disclose promptly factors that might endanger
the public or the environment;
Our project aims to create a safe electric lock under low cost, which will help to
create a safe living environment for our guests in the hotel. We’ll take our
responsibilities to make the lock as reliable as possible in order to create this
environment for our guests.
2. to seek, accept, and offer honest criticism of technical work, to acknowledge
and correct errors, and to credit properly the contributions of others;
While working on this project, we are open to accept all the comments and criticism
from our peer workers and teaching assistants. Based on their feedback and
recommendations, we modified our circuit and implementation.
3. to avoid injuring others, their property, reputation, or employment by false or
malicious action;
We will make sure that the electrical lock we developed in this project will create a
safe living environment for the guests in the hotel and will not have malicious action
under any situation to result in any injuries of the property and health of our guests
and reputation damage of our hotels.
3.4 Safety Statement
The goal for this project is to build an affordable, user-friendly and safety automatic hotel
check-in and out system. In the steps of developing such a project, it is paramount that all
steps involved should ensure the safety for both of the developer and the final user. There
are several parts of potential dangerous should be noticed. The motor module part of the
system contains the mechanical installation which may cause unintentional physical
damage to the manipulator if it is not installed correctly. The final product must have a
suitable case for this mechanical part to prevent the potential damage causing from the
moving parts driven by the motor. The second part of the potential dangerous is coming
from the power module. Though, the voltage of the power supply is not high enough to
cause the directly damage to the human being. It may still harm the manipulator because
of the high temperature coming form the regulator in the power circuit. In order to
remove this potential dangerous, a radiator should be installed near each of the regulator.
Finally, the user of this system should never be exposed to any of the circuit used in the
design. The circuit will have some sharp edge that may cause cut and scratch. It should
also have a suitable case to prevent the user directly contact with the circuit. During the
installation and testing of the circuit, the developer should avoid the burning and lead
exposure. In case of burning hurt, cold ice or cold water should be covered the scaled
area immediately. Furthermore, an severe hurt by the circuit or mechanical device should
cause a medical concern, emergency help should be called.
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4.0 Cost and Schedule
4.1 Cost analysis
4.1.1 Labor
Name
Hourly Rate
Total Hours
Total (Hourly Rate *2.5* Total
Hours)
Yuncong
$30
200
$15000
Tingting
$30
200
$15000
Tianyuan $30
200
$15000
Total
$45000
4.1.2 Parts
Item
Quantity Cost
CC3200 LaunchPad
1
$40
Keypad
1
$10
LED
2
$3.43
Buzzer
1
$5.45
Motor
1
$14.95
Batteries
4
$15
20
Voltage Regulator
2
$5
4.1.3 Grand Total
Section
Total
Labor
$45000
Parts
$110
Grand Total
$45110
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4.2 Schedule
week
Task
15-Sep work on preparing project proposal
work on preparing project proposal
Do Research on purchasing suitable parts
22-Sep Research and select microcontroller elements
Finish up with design review
Research and select Display, speaker and keypad
elements
29-Sep Assemble Soc circuit for microcontroller
User interface implementation
Assemble power converter unites for the lock
microcontroller intial test, test the signal sent and
6-Oct received from the microcontroller
test signal sending from PC side
test/improve 5V power supply stablity
13-Oct Finish up microcontroller test with real key code
Finish up PC side signal sending test with real key
code
Signal Test after connecting PC side and
microcontroller
20-Oct Assemble LED display & Keypad
Assemble the lock with power supply,
microcontroller
work on the functionality of Speaker
27-Oct Individual Project report
Individual Project report
Individual Project report
3-Nov Assemble components together
Prepare mock demonstration
Assemble speaker with the lock
10-Nov Continue hardware test running & fixing
Continue software test running & fixing
Continue general test running & fixing
17-Nov Entire functionality test
Entire functionality test
Entire functionality test
24-Nov Fix any remainning issues
Finalize design
Finalize design
1-Dec Prepare final paper
Prepare final paper
Prepare final paper
Responsibility
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
Yuncong
Tingting
Tianyuan
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Power module (regulator):
https://www.fairchildsemi.com/datasheets/LM/LM7805.pdf
Keypad module:
http://media.digikey.com/pdf/Data%20Sheets/Grayhill%20PDFs/96%20Series.pdf
Bi-color LED :
http://bestengineeringprojects.com/electronics-projects/all-in-one-tester-circuit/
Lock style solenoid
https://learn.adafruit.com/remote-controlled-door-lock-using-a-fingerprint-sensor-andadafruit-io/setting-up-the-electronic-door-lock
Speaker
http://www.edaboard.com/thread272422.html
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