Thursday, 16th October

PCB Design is done.

Subsystem is done.
Patient Care System:
*Thermal Sensor
-There are 5 states; Normal, Hot, Super hot, Cold, Super cold. Normal is at 2-2.3V. Hot is at 1.9-2V. Super hot is at anything below 1.9V. Cold is at 2.3-2.6V. Super cold is at anything beyond 2.6V.
-Normal is represented by GREEN LED. Hot is represented by RED LED. Super hot is by BLINKING RED. Cold is represented by BLUE LED. Super Cold is represented by BLINKING BLUE.
-LCD can show the state that the thermometer is in. There will be special warning for Extreme states.
-LED Fan will be turned on at HOT and SUPER HOT state.
#Possible Upgrade:
-Using LM35DZ instead of Thermistor to make a better accurate reading.
-Using Buzzer to indicate states. Extreme hot: quick intermittent sound. Extreme cold: slower intermittent sound or long continuous sound.

*Light Sensor
-In dimmed environment will light up Orange or Blue LED. LED will be lighted up until a button is pressed to turn it off.
-In dark environement will light up 2 white LED. LED will be turned off once the environment returns to dimmed or bright.
#Possible Upgrade:
-Since sensor is not stable alone, a voltage divider may be formed by combining multiple LDRs or connect it with resistors.

*LCD
-It shows information about lighting, temperature, and patients.
-Moving dots in waiting/loading mode.
#Possible upgrade:
-Moving text
-using pushbuttons to change state

*Fan Cooling System
-Fan will be turned on when the state is hot or extreme hot.
-Fan cannot be used alone from port's output voltage/current. A circuit with transistor must be used to amplify the current
-Arrangement: Output Port ->Resistor ->Base ; Emitter ->GND ; Collector ->Fan GND ; Vcc -> Fan voltage