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#Goal

- Design and integrate a 5 V, 3 kHz buzzer circuit into the existing ESPRSSO32 Smart Scale project, ensuring compatibility with the PP5V0 rail and other existing circuitry.

#Implementation plan

1. Define buzzer type and control scheme

1. Confirm that a passive buzzer is being used so that a 3 kHz oscillator is required.

2. Plan to utilize a 555 timer configured in astable mode if additional oscillator circuitry is needed.

2. Configure oscillator circuit

1. Add and configure a TLC555 (or similar 555 timer) component to generate a 3 kHz square wave using the 5 V supply (PP5V0).

2. Calculate and select resistor and capacitor values appropriate for a 3 kHz frequency.

3. Implement the buzzer driver stage

1. If the passive buzzer requires additional current drive, add a transistor driver stage.

2. Connect the output of the 555 circuit to the buzzer (and transistor base if applicable), ensuring proper current limiting if necessary.

4. Integrate with existing project power rails

1. Connect the oscillator and driver circuit to the existing 5 V rail (PP5V0).

2. Verify ground and signal references to maintain compatibility with the current design.

5. Review and test the integrated buzzer circuit

1. Validate the 3 kHz output frequency and proper buzzer activation.

2. Ensure that the new circuitry does not interfere with existing components such as the TLC555 LED blinker.

#Success criteria

- A functional 3 kHz square wave is generated using a 555 timer or equivalent oscillator.

- The buzzer circuit is correctly powered from the 5 V (PP5V0) rail and integrated without affecting existing project functionality.

- The passive buzzer sounds at the correct frequency when the circuit is activated.

Added 1x TLC555CDR as IC1 (Pins: CONT, DISCH, OUT, RESET, VDD, TRIG, THRES, GND)

Added 3x Generic Resistor as R1, R2, R3 (Pins: P2, P1)

Added 2x Generic Capacitor as C1, C2 (Pins: P1, P2)

Added 1x MMBT2222A,215 as Q1 (Pins: B, C, E)

Added 1x GT-0905A as BZ1 (Pins: -, +)

Set IC1's Frequency to "3kHz"

Set BZ1's Operating Voltage to "5V"

Set BZ1's Frequency to "3kHz"