Element H: PROTOTYPE TESTING AND DATA COLLECTION PLAN

TEST 1: LED Function  

Review Design Criteria- The product will alert the user if total dissolved solids are in or out of range. Green LED is a value between 0-300 ppm, red if above.

Title – Detection Display Test

Purpose—This is to show if the LEDs are working correctly in combination with the TDS sensor to properly alert the user about water safety.

Pass Criteria 

• Both qualitative and quantitative, but mainly quantitative since we can look at the color as a yes/no or 0 and 1

• For just 3 tests, all of them need to pass, meaning the correct LED lights up depending on the TDS reading

• To pass the LED and TDS values must…

  • TDS reading between 0-300, LED is Green

  • TDS reading above 300, up to 1000, LED is Red

Materials – computer (to monitor actual value) and our sensor (to show LED for comparison to number) and water to test

Safety Concerns -list the potential hazards and what you will do to prevent/remedy the hazard.  For example, if fire is a concern you will need to make sure you have a fire extinguisher on hands.                                                    

Stepwise Procedure -

1. Connect Arduino to the computer with code and serial monitor open

2. Turn on the sensor using the on/off button

3. Hold probe/sensor underwater (one in the tap, one in still bottled water, and one in clay water)

4. Observe and record the TDS value on the computer and the color of the LED

5. Togel off the sensor

6. Compare numbers to colors, if they match up in the way they should record a check, if not, an X

7. Repeat for a total of at least 3 tests in different types of water. 

Test 2: Flow disturbance 

Review Design Criteria:  The poduct will not affect the natural flow of the water coming out of the tap while the water is being tested. 

Title- Flow Disturbance Test 

Purpose- This test shows that the product will not affect the flow of the water coming out of the tap while the water is being tested for dissolved solids. 

Pass Criteria- 

• With an average flow rate of 2.2 ppm and 60 psi of the majority of taps, this will not affected 

• Water flow will not be redirected

• No splashing of water 

Materials-  Tap with running water, probe used for testing

Stepwise Procedure

1. Attach the probe at the desired spot on the sink

2. Turn on the tap and observe the effects on the flow of watery  

3. Remove the probe from the tap 

4. Observe the flow of water without a probe 

5. Re-attach and adjust the probe based on observations 

Test 3: Risk of electrical hazards

Review Design Criteria- All electrical components will be safely secured away from running water, lowering the risk of electrical hazards 

Title – Minimal risk of electrical hazards

Purpose – To increase safety and prevent any electrical hazards such as electrocution

Pass Criteria 

• This would be qualitative since the test is making observations. 

• To pass no water should get into the electrical component when the water is being tested for dissolved solids.

Materials – Sensor and water to test

Safety Concerns 

• Electric Shock

• Short-Circuiting 

• Fire 

• Corrosion   

The preventative measure for all of these is for our electrical component to be secured in a way that allows it to open while also being waterproof                                               

Stepwise Procedure -

1. Connect Arduino to battery and place it inside the case

2. Secure the case behind the faucet and run the sensor wire up the faucet 

3. Clip sensor to faucet head 

4. Turn on the sensor using the on/off button

5. Hold probe/sensor underwater 

6. Turn water off 

7. Check the case to see if any water was able to get in 

TEST 4: FAUCET ADAPTABILITY

Review Design Criteria- The product will securely attach to various standard faucet heads and maintain functionality without requiring additional modifications. It should be easy to install and remain stable during use. 

Title –  Faucet Adaptability Test

Purpose – To determine if the sensor piece can securely attach to different faucet heads and maintain stability and functionality during operation. 

Pass Criteria

• Type of testing: Quantitative 

• Criteria for Success: The sensor must securely attach to at least 90% of the tested faucet types without slipping or requiring additional tools. The sensor must maintain functionality during operation for at least 5 minutes on each faucet type. 

Materials – 

• Sensor prototype

• Various faucet types (kitchen faucet, bathroom faucet, outdoor faucet)

• Stopwatch

• Water Supply

• Notebook for observations and data collection 

Safety Concerns 

• RIsk of water spillage

• Avoid over-tightening the sensor to prevent damaging the faucet or the sensor itself. 

Stepwise Procedure -

1. Gather a variety of faucet types to test

2. Connect the sensor piece to the first faucet following the installation instructions provided with the prototype

3. Turn on the water supply to test stability and check for leaks or movement of the sensor

4. Run water through the faucet for 5 minutes, observing whether the sensor stays securely attached and functions as intended

5. Repeat steps 2-4 for each faucet type

6. Record observations, including the ease of installation, stability, and functionality of each faucet