Datasheet — Hw-133-v1.0

Hw‑133‑v1.0

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• Clear Pinout diagrams.
• Includes the vital 5V regulator logic explanation.
• Truth tables are easy to follow for coding.

• If probe voltage < reference: DO = LOW (water detected).
• If probe voltage > reference: DO = HIGH (dry).

5. The Legacy Factor

Hi everyone,

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | DO always HIGH (1) | Sensitivity too low | Turn potentiometer clockwise | | DO always LOW (0) | Short between probe traces or sensitivity too high | Clean probe with alcohol; turn potentiometer counter-clockwise | | AO reads 0 always | Broken wire or probe not connected | Check jumper between probe and control board | | Erratic readings | Power supply noise | Add a 100µF capacitor between VCC and GND | | No LED when powered | Reversed VCC/GND | Disconnect immediately; check wiring | Hw-133-v1.0 Datasheet

terminals and turn the potentiometer clockwise to increase or counter-clockwise to decrease the voltage to your target (e.g., 3.3V or 5V). Safety Precautions Hw‑133‑v1

12. Diagnostics, factory test and troubleshooting checklist

Input vs. Output

: This is a step-down converter. Your input voltage must be at least 1.5V higher than your desired output voltage to maintain stability. Clear Pinout diagrams