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• ESP8266 - 12F: Microcontroller for processing water level information.
• PC817C: An opto-coupler used to protect the water level sensor probe from electrolysis by ensuring electrical isolation.
• Water Level Sensor Probe: Detects the presence of water and interacts with the microcontroller.
• AC Power Supply: Provides power to the circuit and ensures isolation using the opto-coupler.

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• R3 (1kΩ): This resistor limits the current flowing into the diode part of the opto-coupler.
• D2 (1N4148): This diode can be used for reverse polarity protection or signal rectification.
• U4 (PC817A): This is the opto-coupler; it isolates the input and output electrically.
• R4 (6.8kΩ): This pull-up resistor allows the opto-coupler's transistor output to pull low when activated.
• 3.3Vout: This is the output signal that would go to a microcontroller like the ESP8266 - 12F.
• GND: Common ground reference for the circuit.
• F & TCOM: These appear to be the connections to the AC signal or other inputs.

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1. Power Supply:
   • Ensure that the ESP8266 is powered with appropriate voltage, typically 3.3V. Use a suitable voltage regulator if necessary to derive this from your existing power source.
2. Connecting to Opto-Coupler Output:
   • Connect the output of the optocoupler ($U4$) to one of the GPIO pins on the ESP8266.
   • Connect 3.3Vout from the opto-coupler circuit to an available GPIO pin on the $ESP8266 - 12F$. Ensure this pin is configured as a digital input to detect HIGH/LOW levels indicating water presence.
3. Ground Connection:
   • Connect the GND of the ESP8266 to the common ground of the circuit.
4. Additional Components and Connections:
   • Consider adding a filter capacitor between VCC and GND near the ESP8266 to stabilize the power supply.
   • Optionally, integrate status LEDs on unused GPIO pins of the ESP8266 to indicate water level status visually.

• Update your schematic in Flux to reflect these connections.
• Make sure that the ESP8266 is included in the schematic with proper pin assignments.
• Adjust component designators as needed based on your schematic naming conventions.

• In the ESP8266 software, write code to read the GPIO pin connected to the opto-coupler output.
• Implement logic to process the water level signal and take appropriate actions, such as sending alerts, notifications, or logging results.

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1. Bridge Rectifier: To convert AC to DC.
2. Smoothing Capacitor: To smooth out the rectified DC voltage.
3. Voltage Regulator: A device like the LM1117-3.3 regulator can bring the voltage down to 3.3V.
4. Decoupling Capacitors: To stabilize the output voltage from the regulator.

• Use a bridge rectifier consisting of four diodes (1N4001 are common for this purpose) to convert the AC voltage to a DC voltage.

• After the bridge rectifier, add a large smoothing capacitor (e.g., 1000µF, 25V). This will smooth the pulsating DC voltage.

• Use an LM1117-3.3 voltage regulator for stabilization. This regulator will take the smoothed DC voltage and produce a stable 3.3V output.

• Place a 10µF capacitor on the input and output of the LM1117-3.3 voltage regulator to further stabilize the voltage.

1. Connect the AC input to the bridge rectifier.
2. Connect the positive output of the rectifier to the positive terminal of the smoothing capacitor, and connect the negative output to the ground.
3. Connect the positive terminal of the smoothing capacitor to the input pin of the LM1117-3.3 voltage regulator.
4. Connect the ground terminal of the smoothing capacitor to the ground pin of the regulator.
5. Connect the 10µF capacitors between input/output and ground, respectively.
6. Take your 3.3V output from the output pin of the regulator.

• Connect AC to the Bridge Rectifier.
• Connect Bridge Rectifier Positive to Smoothing Capacitor Positive.
• Connect Smoothing Capacitor Positive to LM1117-3.3 Input.
• Connect LM1117-3.3 Output to Load (where you need 3.3V).
• Connect a Decoupling Capacitor between LM1117-3.3 Input/Output and GND.

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• 1N4001: Has a maximum reverse voltage rating of 50V.
• 1N4007: Has a maximum reverse voltage rating of 1000V.

• For your application: Since you're working with a 12V AC transformer, both diodes can technically handle this voltage comfortably, but the 1N4007 would provide more headroom in terms of voltage safety. It offers a higher PIV rating, which may be beneficial if you're looking for more reliability or future-proofing the design against potential voltage spikes.
• Conclusion: The 1N4007 is generally a safer choice due to its higher voltage rating, and it can be used in a wider range of applications beyond just your current project. Therefore, if you have both options and there's no significant cost difference, I recommend using the 1N4007.