Patient Room Monitoring System Design

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Below is a suggestion to update your project schematic based on your design requirements. You can use the "Apply changes" button in Flux to add these schematic components and wiring.
Schematic Component Additions

Table

Component CategorySuggested Component & LinkNotes
MicrocontrollerATmega328PChoose DIP/TQFP footprint as preferred.
Opto-Isolators (x5)PC817One per patient room input for isolation/protection.
Resistors for LEDs220ΩOne per LED in series for current limiting.
Resistors for Inputs10kΩUse as pull-downs on each room input.
LED Indicators (x5)LEDOne per room to show alert/active status.
Buzzer Driver2N2222Use with a base resistor (if needed) and then drive a Piezo Buzzer
Optional DisplayOLED I2C 128x64For showing active room number.
Reset ButtonPush ButtonTo manually reset the microcontroller.
Power RegulatorAMS1117-5.0Include two 10uF capacitors (input & output decoupling).
Capacitors for Regulator10uF CapacitorOne at the input and one at the output of the regulator.
ConnectorsRoom Input Connectors & 12V DC Power JackFor wiring the signals from each room and the external 12V supply.
GroundGroundEnsure all components share this common ground.
Schematic Net Connections
  • Room Inputs:
    • Each room input is connected to an opto-isolator input.
    • The opto-isolator output goes to a dedicated digital input of the ATmega328P with a 10kΩ pull-down resistor applied.
  • LED Indicators:
    • Each LED is driven by a corresponding ATmega328P digital output through a 220Ω resistor.
  • Buzzer Circuit:
    • One MCU digital output drives the base of a 2N2222 transistor (include a base resistor if needed).
    • The transistor’s collector connects to the piezo buzzer (with its other terminal tied to 5V) while the emitter connects to ground.
  • OLED Display (Optional):
    • Connect the I2C lines (SDA and SCL) from the ATmega328P to the OLED display.
  • Power Section:
    • A 12V power input is connected to the AMS1117-5.0 regulator.
    • Place a 10uF capacitor at the regulator’s input and another at its output to 5V.
    • The 5V output powers the MCU and all related logic.
  • Reset Button:
    • Wire the reset button to the MCU reset pin (with appropriate pull-up resistor if needed).
  • Ground:
    • Connect all ground pins from the MCU, opto-isolators, LEDs, buzzer circuit, OLED, and regulator to the common Ground component.
Next Steps
Would you like to proceed with applying these schematic component additions and net connections in your Flux project?
Click the "Apply changes" button to update your schematic as described.
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Let's verify that all schematic nets are correctly connected; I want to check for any missing links before proceeding.

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