Hw-133-v1.0 Datasheet

HW-133-v1.0 DC-DC Step-Down (Buck) Converter module, typically based on the high-frequency switching regulator chip

The HW-133-V1.0 uses a minimal-component layout to achieve its small footprint ( ). Description IN+ Positive supply voltage ( 4.5V4.5 cap V – 28V28 cap V ) IN- Ground / Negative supply OUT+ Regulated positive voltage output OUT- Ground / Negative output (Common with IN-) Hw-133-v1.0 Datasheet

  1. Sensing Mechanism: The exposed copper fingers on the probe form a variable resistor. When water bridges the fingers, resistance decreases. Dry air increases resistance.
  2. Voltage Divider: The probe forms a voltage divider with a fixed resistor on the board. As resistance changes, the voltage at a comparator input changes.
  3. LM393 Comparator: This chip compares the probe voltage (at the inverting input) against the reference voltage set by the potentiometer (at the non-inverting input).

    10. Typical application circuits (concise)

    • Sensor input (single-ended):

      Output Voltage: Adjustable from 0.8V to 20V via an onboard potentiometer. HW-133-v1

      • The Voltage Regulator (The Hidden Gem): The datasheet highlights an onboard 5V regulator. This is a crucial feature. It allows you to feed the motor driver 12V, and the HW-133 will graciously output a clean 5V to power your microcontroller. The datasheet warns you about the jumper cap (J1)—remove it, and you lose the regulation. This is often the source of "why isn't my Arduino turning on?" panic attacks.
      • Current Handling: The sheet boldly claims 2A per channel. Reviewers Note: Don't push it. The L298N is an older bipolar technology. It drops about 2V internally, meaning it turns your battery energy into heat. If you try to run a 2A load, the HW-133’s heat sink will get scorching hot. The datasheet is optimistic; reality requires a cooling fan.

      Jumper / Wiring Note:

      • The sensing probe connects to the control board via a 2-pin or 3-pin jumper cable (signal + GND). Do not swap polarity – look for "+" and "-" marks near the connector.