Instead of having 3 LED’s as the visual output, and alternative would be to use a seven segment display to show a number telling you when a certain temperature is reached. The advantage of this is you can have more than 3 indicators, so you could have different numbers show depending on what age the person having a bath is. For example you would wait for a lower number to show if it’s a baby. The disadvantage of using a seven segment display as the visual output is it isn’t simple enough, when you have a bath you don’t need it at an exact temperature so just having 3 LED’s that light up when the temperature is in that range is enough to tell you if it too hot or too cold.
(g)
For my final solution I decided to use a thermistor to measure the temperature of the bath water, with op-amps as comparators, and 3 different colours of LED’s as an output. Using a LM 35DZ as the temperature sensor would have cost more and being more precise and accurate isn’t needed in measuring bath water temperature. Using logic gates will use up more power and more room because you need more chips. Using seven segment display isn’t simple enough for just telling someone if the bath is the right temperature.
Circuit
Section B - System Development
(a)
Subsystem 1 (Input: Resistor + Thermistor) Subsystem 2 (Process: Op-Amps) Subsystem 3 (Output: LED’s)
(b)
Component Calculation 1 – Protective Resistor Value
The subsystem for this calculation is subsystem 3 (output).
The equation I will use is
Red LED
(E24 Series)
Green LED
(E24 Series)
Blue LED
(E24 Series)
(c)
Subsystem 1: Vout and Current
On the first subsystem I measured the voltage at the points that will be going to the op-amp. On the first subsystem I me...
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...otentiometer until the circuit was working, then took it out and measured the resistance, which was 4.79kΩ, I then got a resistor you can fine tune with a screw driver and set it to the same as what the potentiometer was.
Retest Results
LED Expected (°C) Actual (°C)
Blue 35.5 35
Green 38 38.2
Red 42 42.3
The results show the modification has been successful because the values are closer to the expected values and they won’t change if you accidently twist the potentiometer, because you can only change the resistance with a screw driver.
Works Cited
www.ask.com/question/what-is-the-average-temperature-of-bath-water http://www.netdoctor.co.uk/healthy-living/parenting/baby-bath.htm http://www.rapidonline.com/pdf/56-0430.pdf http://www.rapidonline.com/pdf/56-0435.pdf http://www.rapidonline.com/pdf/55-1810.pdf
http://m.netdoctor.co.uk/childrens-health/baby-bath.htm
First, 100 mL of regular deionized water was measured using a 100 mL graduated cylinder. This water was then poured into the styrofoam cup that will be used to gather the hot water later. The water level was then marked using a pen on the inside of the cup. The water was then dumped out, and the cup was dried. Next, 100 mL of regular deionized water was measured using a 100 mL graduated cylinder, and the fish tank thermometer was placed in the water. Once the temperature was stabilizing in the graduated cylinder, the marked styrofoam cup was filled to the mark with hot water. Quickly, the temperature of the regular water was recorded immediately before it was poured into the styrofoam cup. The regular/hot water was mixed for a couple seconds, and the fish tank thermometer was then submerged into the water. After approximately 30 seconds, the temperature of the mixture leveled out, and was recorded. This was repeated three
in the experiment of the Atomic Wight of the Element Silver. We react excess amount of copper with silver nitrate solution. To determine the amount of copper reacted and silver that is produced. The first thing that we did was rinsed 150 ml beaker with distilled water. Second, we dispense 10.00 ml of silver nitrate into rinsed beaker. Then we added 100 ml of distilled water to the beaker. Third we obtain a precut copper wire and then winded around large wide mouth test tube to produce a helix or coil of wire. After that we weighed the wire which is 2.1290g in balance number 5. Fourth, we placed the copper wire in the beaker containing dilute silver nitrate solution at 11:30 and then we taped on the copper wire to dislodge the silver metal into
water and the slower the reaction will be. If the pot is close to the
Two electrical wires * Stopwatch * Thermometer Method I put a piece of Elodea Canadensis (pond weed) in a test tube and covered it with water. The test tube was then placed in a beaker with a thermometer so that the water stayed the same temperature, this was then placed in a cardboard box with a bulb attached to a voltmeter by the electrical wires so that I could concentrate how much light the plant got. I varied the voltage (intensity) of the bulb and counted how many bubbles of oxygen were created at each voltage in one minute. I tested each voltage three times for accuracy for a minute each time. Results Preliminary Experiment Amount of bubbles Light intensity (lux)
For Aqualisa’s Quartz shower system to become more profitable and accepted in the United Kingdom’s, stagnant, unimaginative, shower market, Rawlinson needs to work to educate all potential consumers on the features and benefits of the Quartz shower system. More importantly, to gain that market share needed to make the Quartz system successful, Rawlinson needs to focus the Quartz marketing efforts on the do-it-yourselfers, and the plumbers. These markets are the areas that this new product and technology would have the most direct effect on, they will be the installers of the product, and in most cases the decision makers on where the system will be installed. Without the acceptance and buy-in of these two key markets, the Aqualisa Quartz shower system will not grow its market share or change the perception of showers in the United Kingdom.
Styrofoam Cup Calorimeter - This will be used to measure the amount of heat involved.
UK shower market had (has?) a big potential, since only 60 percent haven’t had a shower. Many homes still had archaic, gravity based plumbing and cold water tank or cistern on the roof. Separate boiler and cylinder were needed to store hot water in a nearby airing cupboard. Sound like a good opportunity.
The water baths were well controlled, and the thermometers helped to control the desired temperatures. the water baths I think were accurate enough but having two thermometers in each bath maybe would have helped to be hold the temperature readings more accurate.
Company: Aqualisa, 3rd in the shower market with 18% coverage has had a successful marketing strategy, which allowed it to enjoy 25% net return on sales and a growth of 5% to 10% in a mature market. They have effectively segmented their markets and have products that cater to each segment's needs (product range of 9 models covering the three types of showers used in the UK, ranging between 230 and 670). Their channel relationships are strong and positioning has helped them achieve a good brand name in the market. The company used the shower max (specialized product similar to Aqualvalve at lower priced than the before mentioned) to penetrate the developer's market.
"The Home Depot TV Commercial, 'The Bath You Want'" ISpot.tv. N.p., n.d. Web. 19 Apr. 2014.
- Temperature was measured after and exact time i.e. 1 minute, 2 minutes, 3 minutes.
In the United States, a massive quantity of homeowners only have a bath tub in their houses. Most bath tubs truly are not just bathtubs; numerous also double as showers. As good as it's to only have one bathroom fixture, in particular one which could do two jobs, you might be on the lookout for a lot more. Should you be looking to remodel your bathroom, you may would like to take into consideration purchasing your self a new bathtub. Sad to say, you will get that not all bath tubs double as showers; for this reason, you could also be inside the market for a new shower stall.
Construct one of the Amplifier circuits following directions and using the soldering iron. Connect battery and speaker to the circuit. Connect the amplifier circuit to the oscilloscope and signal generator. Connect the signal generator directly to the oscilloscope. Calculate the voltage amplitude from the amplifier from the minimum and maximum settings. Calculate the gain in decibels.
The bottom-line is even if you choose to bath seven times in a day, still if you are light or dark you will remain the same. Also still the next day you wake up, you will still be dirty and will need yet another bath. So, apparently it is not how many times you bath, but more of the freshness you get from the showering. If resources permit, some people deep themselves in Jacque form bathtub wash with special body wash foams. That is very okay, but a simple showering with soap, scrub sponge and towel can also do the trick. Use of a scrub stone for under fit and toe nail is usually very helpful as your legs will feel nice and clean after use. Usually, you no longer need a toe-nail cutter as the job is done by the scrub stone. There is so much that can be done to make your bathing as comfortable as possible. Bathing time can be very therapeutic if you take it that way. It is quality time to touch base with your own body and to thank the good Lord Jesus for how wonderfully and fearfully made, Psalms 4:10. You will be communicating to yourself and having an opportunity to actively massage your own body. Therefore, once in a while if you are a very busy person, take time to spend more time than you usually take to bath therapeutically. Due to busy work schedules and the like, most people only take less than five
tube. Add 6 mL of 0.1M HCl to the first test tube, then 0.1M KMnO4 and