Instead of having 3 LEDs as visual output, an alternative would be to use a seven segment display to show a number telling you when a certain temperature is achievement. The advantage is that you can have more than 3 indicators, so you can have different numbers depending on the age of the person taking a bath. For example, you would expect a lower number to indicate if it is a baby. The downside of using a seven segment display as a visual output is that it's not simple enough, when you take a bath you don't need it at an exact temperature, so just have 3 LEDs which light up when the temperature is within this range. is enough to tell you if it's 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 operational amplifiers as comparators and 3 different colors of LEDs as indicator. to go out. Using an LM 35DZ as a temperature sensor would have cost more and it is not necessary to be more accurate and precise in measuring bath water temperature. Using logic gates will consume more power and more space because you will need more chips. Using a seven-segment display isn't simple enough to just tell someone if the bath is the right temperature. CircuitSection B - System Development (a) Subsystem 1 (Input: Resistor + Thermistor) Subsystem 2 (Process: Operating Amps) Subsystem 3 (Output: LED (b) Component Calculation 1 – Resistor Value protection 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 CurrentOn the first subsystem, I measured the voltage at the points that will go to the op-amp On the first subsystem, I... middle of paper ... ...otentiometer until the circuit worked, then I removed it and measured the resistance, which was 4.79 kΩ, then I got a resistance that you can set correctly Adjust with a screwdriver and set - it to the same value as that of the potentiometer Results of the new testLED Expected (°C) Actual (°C) Blue 35.5 35 Green 38 38.2 Red 42 42.3 The results show that the modification was successful because the values ​​are more close ones. to the expected values ​​and they won't change if you accidentally turn the potentiometer, because you can only change the resistance with a screwdriver. Works Cited www.ask.com/question/what-is-the-average-temperature-of-eau du bain 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.pdfhttp: //m.netdoctor.co.uk/childrens-health/baby-bath.htm