Week 24

Title: Assemble hardware and Piezoelectric.

Objective:

1. Completing the staircase structure.
2. Place the piezoelectric at the hardware.

Method:

1. Place the cover to make the staircase look nice.
2. Solder the connection and place the piezoelectric at the staircase.

Result:

Conclusion:

The staircase structure and piezoelectric connection are done and ready to use.

Week 23

Title: Construction of the Staircase

Objective:

1. To build the staircase that stable and able to stand a person.
2. Able to place the piezoelectric disc

Method:

1. Find the suitable material at the hardware shop.
2. Design and construct the staircase.

Result:

Staircase structure and plywood for the base.

It can withstand the maximum weight of the person around 75kg.

Conclusion:

The staircase is construct carefully and hardly so pedestrian can step on it.

Week 22

Title:  Circuit Construction for Energy Harvesting Circuit and step-up voltage circuit.

Objective:

1. To make sure the circuit working smoothly
2. To detect any problem occur.

Method:

1. Solder the circuit into donut board.
2. Testing the circuit.

Result:

The energy harvest circuit is construct by using the circuit diagram provided from the data sheet.
http://www.linear.com/docs/28909

Conclusion:

The circuit is working properly and it give the output of 3.5V, and its the same value with last testing procedure.

Week 21

Title: Testing Piezoelectric with IC (LTC3588).

Objective:

1. To measure the output from piezoelectric.
2. Stabilized the output for further use,

Method:

1. Connect the pieze-disc by soldering to the piezoelectric.
2. From the piezoelectric, make a connection to IC (LTC3588).
3. Measure the output with multimeter.

Result:

The result show in the video.

Conclusion:

The output from the piezoelectric through the IC is 3.5V and its stable.

Week 20

Title: Soldering the Energy Harvest IC on PCB board.

Objective:

1. Solder on PCB for protection to IC.
2. Prevent the IC from damage.

Method:

1. Find shop that can solder IC that use blower.

Result:

Before the IC solder to PCB.

After the IC has been solder to PCB.

Soldering is completed.

Conclusion:

By completing the solder of energy harvest circuit (LTC3588) IC, next testing with piezoelectric can be done for next stage of the project.

Week 19

Title: Meeting With Supervisor to Show List of Hardware

Objective:

1. To get confirmation about suitable material to buy.
2.  To discuss the material need to use in the project 

Method:

1. Show the specification of the hardware based on the project needs.
2. Show all hardware listing to supervisor that need in your FYP project.

Result:

List of item:
1. Piezoelectric (20pieces)

2. Plywood

3. Steel (L-design)

4. Energy Harvesting Circuit.

5. Step-up voltage circuit

Conclusion:

By listing the component that need to buy, the project can start to be build for first stage.

Week 18

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.

For data sheet,

http://www.linear.com/docs/28909

Conclusion:

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