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Liquid hand soap automatic dispensing docking system with alarm. Group 32 Jung Il Yoo , Stanley Kim, Ho Chan Joo ECE 445 Senior Design May 2, 2011. Introduction. No need to refill the soap. No need of cleaning. Can easily replace liquid hand soap. Controls amount of soap.

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liquid hand soap automatic dispensing docking system with alarm

Liquid hand soapautomatic dispensing docking systemwith alarm

Group 32

Jung Il Yoo, Stanley Kim, Ho Chan Joo

ECE 445 Senior Design

May 2, 2011

introduction
Introduction
  • No need to refill the soap
  • No need of cleaning
  • Can easily replace liquid hand soap
  • Controls amount of soap
  • Saves the amount of soap used
features
Features
  • Can recognize toilet usage and notify the user to wash hands
  • Can dispense soap according to estimated hand size
  • Can dispense soap according to user’s demand
system overview
System Overview
  • Hardware
    • - Power Supply(9V Battery X 4)
    • - Arduino X 2
    • - Transmitter/Receiver
    • - PIR sensor X 2
    • - Capacitive Touch Sensor IC X 2
    • - Motor
  • Software
    • - PC control for transmitter/receiver
    • - PC control for capacitive sensors
system overview1
System Overview

Battery

PIR Sensor

Transmitter

Microprocessor 1

system overview2
System Overview

Battery

Touch Sensors

Receiver

PIR Sensors

Microprocessor 2

Buzzer

Motor

Battery

hardware overview
Hardware Overview
  • Power Supply(9V Battery)

- Model : LM7805AC

- Takes 9V from the battery and outputs 5V

hardware overview1
Hardware Overview
  • Microprocessor

- Arduino Uno : Transmitter, PIR sensor

- Arduino Mega : Receiver, Capacitive touch sensors, PIR sensor, Motor

hardware overview2
Hardware Overview
  • PIR Sensor

- Model : SHARP 2D120X

- Supplied Voltage : 5 V DC

- Output Voltage : 2.5V DC

- Detection Length : 6.35cm

hardware overview3
Hardware Overview
  • Transmitter/Receiver

- Operating Frequency : 315MHz

- Sampling Frequency : 2000 bps

hardware overview4
Hardware Overview
  • Toilet Usage Detection
  • - Triggered by PIR sensor
  • - MCU sends out signal (4.8V DC)
  • - Transmitter transmits the signal
hardware overview5
Hardware Overview
  • Buzzer

- Operating voltage : 6V DC

- Controlled by MCU 2

- Voltage from MCU2 : 2.5 V DC

- Sound intensity differs by the input voltage

hardware overview6
Hardware Overview
  • Capacitive Touch Sensors

- Two B6TS-04LT Capacitive Touch Sensor ICs

- 5 Copper 2.5 X 5 cm Touch Sensors

- Send inverted outputs to Arduino

hardware overview7
Hardware Overview
  • Motor
  • Model : PITTMAN GM8721
  • Supplied voltage : 14.12V DC
  • Internal resistance : 11.3 ohms
  • Power consumption : 11.83W
  • 90 rpm
software overview
Software Overview
  • Transmitter/Receiver
  • - Sends and receives signal
  • Capacitive Touch Sensors
  • - Enters manual mode when one sensor touched
  • - Enters hand size estimation mode when two or more sensors touched
success
Success
  • Able to replace hand soap easily
  • Toilet usage detection system
  • Dispensing according to estimated hand
  • size
  • Dispensing according to user’s demand
challenges
Challenges
  • Calibration
  • - PIR sensor sensitivity
  • - Touch sensor sensitivity
  • Incorporation
  • Trouble combining the parts together
  • Insufficient power
  • Motor requires high supplying voltage
  • - MOSFET and driver is required for
  • protection of the circuit
tests
Tests
  • Motor Test

Supplied Voltage : 14.12V (two 9V battery in series)

- Running motor graph

- Motor stuck graph

tests1
Tests
  • Capacitive Touch Sensor

Output is low when pressed

tests2
Tests
  • Output to motor from Arduino
tests3
Tests
  • Transmitter

2000 bps

1000 bps

After several tests,

2000bps(sampling frequency)

works better

recommendation
Recommendation
  • Use LCD to display message to the user
  • Find more power efficient components
  • Find power efficient pumping system