WEEK 5: FRITZING - Connection

Below is the list of sensors I'm using:-

a) DS18B20 water temperature sensor

b) SEN0161 pH water sensor 

c) Atlas Scientific dissolved oxygen sensor

So based on the sensors above, I've done the virtual connection which I'm planning to do on the hardware later. I tried using the Fritzing software which I only manage to do the connection on the dissolved oxygen module since I can't find the part for pH and water temperature.

Fritzing of the hardware

WEEK 4: COMPARING THE PRICE OFFERED AT JALAN PASAR

While waiting for the temperature sensor to arrive, I've also surveyed the pH and dissolved oxygen sensor. So, I went to the Jalan Pasar, a well-known place to shops for the electronic components and stuffs related to it. Since I'm in a tight budget, i went a few shops to compare the prices. 

Unfortunately, the dissolved sensor is not available at all the shop i visited and the only solution for that is by ordering the dissolved oxygen sensor online at the trusted website. To ensure that that the websites is trusted, I always done a little bit of research on it by reading all of the customer reviews before deciding whether to buy from the certain website or not.

For the pH sensor, the prices ranged from RM150 to RM180 for the one that includes the pH module whereas the price for the pH probe without the module is only RM60 as offered at the Sigma Electronics. Besides that, the price for the pH sensor with pH module at QQ Trading is RM180 while the shop which I'm not sure what the name of the company offered a lower price than QQ Trading which is RM169.

pH probe without pH module available at Sigma Elcetronics.

                                             

pH sensor (pH module included) at QQ Trading.

In the end, I decided to take a look at the price of the pH sensor offered online since there is not much choices at the shops in Jalan Pasar which the price may be much cheaper than the one offered at Jalan Pasar.

This is the shop which I'm not sure the name of the company.

                                           

The uncle (owner of the shop) checking the component using multimeter.

                                         

                                               

                                  

WEEK 3: TEMPERATURE SENSOR

I've successfully ordered the DS18B20 temperature sensor online on the Cytron website. For your information, Cytron offers free shipping as a part of the benefits when you signed up for their student program which is why I ordered the temperature sensor here.

Order Information on Cytron's Website.

So, as shown in above the total price is RM16.69 (including GST) since i ordered two temperature sensor for me and my friend. The temperature sensor is estimated to be arrived in 2-3 working days unless there's a problem with the item or the process, where the time of arrival may be delay for a few days.

WEEK 3: TEMPERATURE SENSOR

I've decided to use the DS18B20 temperature sensor as it is waterproof. Since my water quality monitoring project requires the sensor to be immersed in the water, so this type of water temperature sensor is very suitable to be used in my project.

DS18B20 Temperature Sensor

The DS18B20 Digital Temperature Probe provides 9 to 12 bit (configurable) temperature readings which indicate the temperature of the device. Information is sent to/from the DS18B20 over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS18B20. Power for reading, writing, and performing temperature conversions can be derived from the data line itself with no need for an external power source. Each DS18B20 contains a unique silicon serial number, multiple DS18B20 temperature sensors can exist on the same 1-Wire bus. This allows for placing temperature sensors in many different places which is a perfect sensor to be used for monitoring purpose.

The specification of the water temperature is as below:

DS18B20 Temperature Sensor Specification