TIMER CIRCUIT

Our timer used resistors and capacitors to create timed intervals. These intervals were integral to the design, as we did not want our circuit constantly reading inputs, so the outputs were more accurate. We connected an LED to indicate how fast the timer was. Once we realized the LED was blinking too fast, one of the resistors was changed to one with lower ohms. This slowed the intervals of the timer down. Once it was done, our timer circuit was connected to the flip flop.

LOGIC CIRCUIT

In our logic circuit, a combination of AND gates, OR gates, and invertors to create the logic. Outputs from the logic section went into the flip-flop, where it was outputted to light up the correct LED. The logic for this circuit indicated that if there were three symptoms an alarm would go off, two symptoms would cause a red light to go off, one symptom would trigger a yellow light, and the green light would be on if there were no symptoms. While considering the symptoms, we inverted the oxygen switch, as explained earlier, because it would make more sense if we were taking readings from a sensor to have a warning when oxygen levels were low. In our circuit we also used a color coding which made our lives much simpler when testing and identifying problems with the circuit. Basically, the input to the logic gates were represented by three colors: orange, purple, blue, which represented oxygen saturation, cough, and temperature respectivelly. For the outputs of the logic gates we used four colours: red, green, yellow, which represented the LEDs with those colors, and the color purple, which was used to represent the alarm.