DEVELOPMENT OF HOME SECURITY SYSTEM USING PIEZO SENSOR

WEEK 12

From week by week my project to generate the energy by using piezo sensor is always have the problem. Which is the value of current is so small and the output is also cannot be maintain with this problem it is difficult to continue my project.


So, i already discuss with my FYP supervisor to change the title project. But this project is also using a piezo sensor but only just send a signal to the arduino. Now the official title for my FYP project is  DEVELOPMENT OF HOME SECURITY SYSTEM USING PIEZO SENSOR. And im also try my best to make sure this project are successful before the FYP presentation at week 15.

Energy Harvesting Circuit for Piezoelectric

Title: Energy Harvesting Circuit for Piezoelectric

Objective:

1. To use this IC as main circuit for piezoelectric.
2. To get stabilized output from piezoelectric.

Method:

1. Make research and find data sheet for this circuit.

Result:

This breakout board uses the LTC3588 Piezoelectric Energy Harvester from Linear Technologies. This board can be used not only for harvesting piezoelectric energy, but solar energy as well. There is a bridge rectified input for piezo elements (PZ1 and PZ2) and a direct input (VIN) for DC sources. Both are clamped to 20V. In addition, the board can simply be used as a standalone nanopower buck regulator.

An ultralow quiescent current undervoltage lockout (UVLO) mode with a wide hysteresis window allows charge to accumulate on an input capacitor until the buck converter can efficiently transfer a portion of the stored charge to the output. In regulation, the LTC3588 enters a sleep state in which both input and output quiescent currents are minimal. The buck converter turns on and off as needed to maintain regulation.

Four output voltages (1.8V, 2.5V, 3.3V and 3.6V) are pin selectable with up to 100mA of continuous output current and comes pre-configured for an output of 3.3V. However, the output capacitor may be sized to service a higher output current burst. An input protective shunt set at 20V enables greater energy storage for a given amount of input capacitance.

Conclusion:

This circuit can be used in this project to make this project working effectively.

Learn more about PIC

I already study about PIC to use on my FYP project and this is one information i get from my study. this project maybe only just using program code digital voltmeter to detect value of voltage on my battery after i already charged the battery by using piezoelectric sensor.

sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
int Adread;
float voltage;
char volt[4];
void main() {

PORTA = 0;
TRISA = 0X01;
PORTB = 0;
TRISB = 0;
LCD_Init();
ADC_Init();
LCD_Cmd(_LCD_CURSOR_OFF);
LCD_Cmd(_LCD_CLEAR);
LCD_Out(1, 1, “Digital voltmeter”);
delay_ms(1000);
while (1)
{
voltage = ADC_Read(0);
voltage = (voltage * 5 * 10)/ (1024);
inttostr(voltage,volt); // it converts integer value into string
Lcd_Out(2,1,”Voltage = “);
Lcd_Out(2,11,Ltrim(volt));
Lcd_Out(2,13,”Volt”);
}
}

source:click here

Buck Boost Converter

Title:
Step up voltage (DC-DC) module

Objective:

1. Find suitable module to boost up the voltage.
2. To fulfill the next objective for output. 

Method:

1. Research from the internet (e-bay.com, lelong.com.my)

Result:

DC 3-34V to DC 4-35V DC-DC Adjustable Boost Step-up Power Supply Module

Description:

• LM2577S non-isolated boost module
• Input Voltage: DC 3-34V
• Output Voltage: DC 4-35V (continuously adjustable)
• Input Current: 3A (max.)
• Output Current: 2.5A (max.)
• Operating Temperature: -40 deg C to +85 deg C

Conclusion:
The output voltage can be vary from 4-35V DC and can be use for output.

Design circuit for bridge rectifier

From this circuit, i want to show the waveform the rectifier can convert from AC to DC and capacitor is to make the DC output more stable.

Testing piezo-electric transducer

Title:
Testing piezo-electric transducer

Objective:

1. To test the output of piezoelectric.
2. To make the observation

Method:

1. Connect 4 pieces of piezoelectric in series and parallel connection and record the output.

Result:

In parallel connection, the piezoelectric will produce about 2-16V AC depends on the mechanical stress that had been apply towards. But the output voltage is stable because of the mechanical stress is not the in the same amount of pressure.
If in series connection, it will step up the the voltage up to 24V AC.

Conclusion:

.The piezoelectric will produce the AC output voltage when the mechanical stress is apply.

New task to find the ratio of sensor can provide voltage

FINAL YEAR PROJECT 2 S2 2017

Alhamdulillah im already can procced for FYP 2 for this semester. 1st thing what im need to do for this FYP 2 is i need to learn how LCD on this project can display based on the value battery. LCD display must be start with microcontroller. So, im already find information for this microcontroler and based on my knowledge for microcontroller coding it should be use a digital voltmeter on microcontroller to detect the value from the battery. Im find the info is from the microcontroller lab web. 

Based on this picture it will be give some information for me to do design for this project on HOW TO DETECT VALUE OF VOLT ON BATTERY.

UPDATE NEW BLOG DIAGRAM

Based on previous blog diagram, i have a lot problem how to manage the process of this project. As example from previous blog diagram i use a ADC this project. We already know the function of ADC to convert analog to digital. so it is a big mistake for my project because on this project we did't need  the digital converter. But we just need to rectifier circuit because to make a current from piezoelectric sensor flow in one direction and to prevent the flow current back to piezo sensor.

FIND MORE INFORMATION ABOUT PIEZOELECTRIC SENSOR

Based on this research i can more information about piezoelectric sensor. for this link http://www.explainthatstuff.com/piezoelectricity.html i get a new information about piezoelectric sensor. How the Piezoelectric sensor works which mean how the piezoelectric sensor can produce from mechanical energy convert to electrical energy.

For this time i will simplify the process of piezo sensor works:

1. Normally, the charges in a piezoelectric are exactly balanced, even if they are not symmentrically arranged.

2. The effect of the charges exactly cancel out, leaving no net charge on the crystal faces. ( more specifically, the electricity dipole moment- vector line separating opposite charges- exactly cancel one another out.) 

3. if squeeze the crystal, the force will charges out of balance.

4. The effect of the charge ( their dipole moment) no longer cancel one another out and net positive and negative charge appear on opposite. 

5. So by the squeezing the sensor , it will be produce a voltage across its opposite faces. And that is called PIEZOELECTRICITY.

GENERATION OF IDEA BASED ON LITERATURE REVIEW

GENERATION OF IDEA

Based on all of journal that has found, it has some of info to use on this project. As example, for first journal is application of piezoelectric sensor and concept of piezoelectric sensor which is to convert mechanical energy to electrical energy. Other than that, piezo impact created is because of the adjustment in the electric polarization of the materials due to the apply stress which prompts the production of electric current or voltage. Next for second journal is for piezoelectric sensor have two type of effect which is direct piezoelectric effect and converse piezoelectric effect. Direct piezoelectric effect is the generation of electric charge when mechanical strain is applied on piezoelectric materials; whereas the converse effect is defined as the deformation in the crystal caused, when an electrical voltage is applied to the piezoelectric materials. Next journal is known about requirement for a wireless electrical power supply has impelled  an enthusiasm for piezoelectric energy collecting. So, all journal give a more knowledge and can apply on this project.