week 4 - 7

Week 4: Submit proposal

Week 5:

Research what to monitor, what method to choose.

Decide to monitor water quality – many parameters involved; turbidity, pH, mineral, chemical

Decide to use grab sample method – use clean tube or container to put water sample

    various picture taken from net regarding to water sampling

Why monitor water? for fishing, drinking (safe or not for drinking), swim; contaminated oily substance not suitable for our skin, wash – dirty water can’t use for cleaning

Week 6:

change method, grab sample method not suitable and not optimize for microcontroller (PSoC). 

I decided to use semi continuous monitor method. Model decided; prototype – attach on pipeline before sink

 

Idea to put sensor at the water pipe near the tap.

Idea – system will start monitor water quality when user open the tap, water will start flow. User can decide the usage of water according to result (output from PSoC) of water reading by sensor.

Clear – can use for drink (boiled), wash

Moderate – water will be filtered before can use for washing, not safe for drink even after boiled.

Dirty – can’t drink even after boiled, can’t wash at all.

Week 7:

Determined the input sensor will be use; Infra Red sensor as the idea & suggestion by my supervisor. Dr Zulkhairi get the idea from Intelligence Washing Machine; the machine will detect the level of cleanliness of water using infra red sensor. If dirty, it will keep washing until clean. i need to study how the Infrared sensor work to detect the water dirtiness

Doing some research for other sensor regarding water quality; pH sensor, O2 dissolved, chemical - all this sensor are very expensive, some reach RM1k. so it’s not suitable for my FYP.

other idea is to use LDR (Light Dependent Resistor) sensor. white LED will be used as light source and LDR sensor will detect the light from LED. if any contaminated flow through, the LDR will received less light signal. less light signal equal to dirty of water. full light detected means the water is clear.

after doing some research, this LDR sensor is not suitable for my project. i'm planning to use transparent tube for water flow. so the LDR's reading will be affected by ambient light, this is what we call 'light pollution'. so for the time being i've decided to use infrared sensor for the input