WEEK 14

Presentation

Allhamdullillah, we have been success to present our project Digital pH Meter. Even the Digital pH Meter can't shows a result as we want, we manage to explain to the jury of FYP Presentation-Day the functionality of the Digital pH Meter. Thanks to our supervisor, Mdm. Norhayati for helping us and provide us some guide on long period of Digital pH Meter construction until a Presention-Day.

WEEK 13

Construct Arduino

The result on display of pH measurement work well by testing using breadboard. Now we assemble all component on it own casing that we make. On this short time only one week left, we using a straight-board because we won't have enough time to hatching a PCB.

EXPERIMENTING.

The result still won't work as well as we expected but we manage to complete the construction of it case. The display didn't show right result this time.

WEEK 12

Arduino

 On our research, we have been use same circuit but not using same PIC of Arduino circuit. That is mean our circuit is has the same build and component of Arduino. So we have plan to use an Arduino to replace our previous circuit that we have been construct.

Arduino is a lot easier to use and we can learn using it by one week. The plan of using Arduino work pretty well. In this week, we don't have quite enough time to hatching new PCB, so we assemble all component include use breadboard to test it and programmed it by using same formula that we use on previous PIC.

We hope that the result would be as what as we expected.

WEEK 11

THE RESULT

            The result for this project is, this project has not been able to achieve some of the objective. Digital pH meter we’ve made is not close loop type circuit. This is because our digital pH meter from finish of manufacturing its work well and show a result. But after editing a calculation that we use to program our main controller PIC and troubleshoot it cause a lot of damage.

            To complete the project, a lot of research are need to be done to collect the information about this project. The method we use in the project is also important to make sure the project can function well. Knowledge in software and skill on hardware is also important in completing the project.

           Designing the project using software such as Proteus, Altium, and MicroC Pro give us a lot of experience and need to spend a lot of time while studying using it more efficiently and we hope it can be implement in the future.

So we have need to plan a new way to finish this project before FYP presentation on week 14.

WEEK 10

EXPERIMENTING

    We are experimenting our Digital pH meter. Sometime this device had some problem to measure the pH on liquid and give a perfect calibration on display by using a formula that we applied on PIC that we use. The result for acid we got from the measurement is pH 4.00 and when we applied on alkaline it shows pH 10.00.

Its work well, but sometimes display not showing pH result properly. So we follow the guide for a probes to keep it clean and safe before it damage it a lot. We will keep experimenting this Digital pH Meter for days by days to test it and maintance the durability and keep update on the result on display so it would not error for time to time.

WEEK 9

PCB hatching and construction

WEEK 8

List of componen

Picture 1.1 list of component

Voltage regulator

           The LM317 is a linear voltage regulator used in DC to AC converter applications. The overall function of the LM317 is similar to that of the LM78xx series regulators. Whereas the 78xx series of regulators have fixed output voltages (5V output), the LM317 can be adjusted to any voltage (within its limits) .They are designed to supply more than 1.5 A of load current with an output voltage adjustable over a 1.2 to 37 V range. The nominal output voltage is selected by means of only a resistive divider, making the device exceptionally easy to use and eliminating the stocking of many fixed regulators. 

figure 1 Voltage regulator

Resistors

           Resistors are the most commonly used component in electronics and their purpose is to create specified values of current and voltage in a circuit. A number of different resistors are available .Resistors with power dissipation below 5 watt (most commonly used types) are cylindrical in shape, with a wire protruding from each end for connecting to a circuit .Practical resistors have a series inductance and a small parallel capacitance; these specifications can be important in high-frequency applications. In a low-noise amplifier or pre-amp, the noise characteristics of a resistor may be an issue. The unwanted inductance, excess noise, and temperature coefficient are mainly dependent on the technology used in manufacturing the resistor. They are not normally specified individually for a particular family of resistors manufactured using a particular technology. A family of discrete resistors is also characterized according to its form factor, that is, the size of the device and the position of its leads (or terminals) which is relevant in the practical manufacturing of circuits using them.