TING's final project

Assembly & Testing


PART 1 : Pump Mechanism

To get the pump to work properly, a supply of around 5V to 6V is required. The purpose of the pump is to bring fresh water into the anodic chamber before taking voltage reading, it need not be continuously on. Also, to allow flexibility in controlling the pump flowrate, the PWM pin will also be used. To drive the pump this way, the L-298 H-bridge is used.

pump_works.jpg
Click Here to download the the Arduino Sketch file for the pump test run.



The pump will turn on for 2 seconds, off for 1 second and repeats

PART 2 : Voltage Reading and Bluetooth transmission to Android Phone

For voltage measurement, the ADC pin (PC1) is used. The bluetooth module HC-04 is connected to the Tx and RX pins on the Atmega chip (Pin 1 and Pin 0). For the Android handphone App, the MIT App Inventor is used.

MIT App Inventor is an intuitive, visual programming environment that allows everyone to build fully functional apps for smartphones and tablets. It is started by a small team of CSAIL staff and students, led by Professor Hal Abelson and today there are more than 8.2 million registered users from 195 countries. Till date more than 34 million Apps have been created with App Inventor.

I referred to the following websites to develop my App below:

Roboindia.com site 1
Roboindia.com site 2
Electronoobs.com


app_inventor1.jpgMIT App Inventor Web-Based interface


MIT App Inventor is web-based and is easy to use with many built-in programming blocks. These built-in blocks are available for a wide range of components.

app_inventor2.jpgUsing Blocks to create the program
app_inventor3.jpgUploading the App to the phone
Click Here to download the *.apk file for the Android App in Zip format

Turning the potentiometer will change the voltage display on the smartphone app.
Click Here to download the Sketch file for the test


PART 3 : Tidying Up the PCB and Wiring

To arrange the PCB as well as the breakout boards, a fixture is designed using Fusion 360 and 3D printed.

pcb_support.jpg
Custom-designed blocks for PCB and breakout boards
pcb_support1.jpg

PART 4 : Assembly
assemble.jpg
completed_mfc3.jpg


PART 5 : Final Test

The MFC is designed to sample every 10 minutes. Prior to reading and transmitting the voltage to the smartphone, the water pump will be on for 8 seconds to bring fresh solution to the anodic chamber. For the demostration video, the Sketch program is modified as follows:

modified_program.jpg
Click Here to download the modified Sketch file used for the testing



Final Test



A 1-minute video and a project poster was created to summarise this final project.

Click Here to download Project Poster/Slide.
Click Here to download Project Video.



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