Hw-133-v1.0 Datasheet

The Hw-133-v1.0 typically separates into two boards: the sensing probe (exposed copper tracks) and the control board (LM393). The control board has a 4-pin male header.

The HW-133 datasheet shines in its physical mapping. It clearly labels the 6 input pins (ENA, IN1, IN2, IN3, IN4, ENB).

Since there is no single official PDF from a major semiconductor manufacturer, the community has reverse-engineered the specifications. Here is the critical data you need: Hw-133-v1.0 Datasheet

Unlike complex ICs, this board is simple. Looking at the 4-pin header, you will find:

I2C bus:

Power:

If you are reading the HW-133 datasheet, you are likely holding a small, red PCB with a distinct blue potentiometer and a cluster of pins. This is the L298N Motor Driver Module. The Hw-133-v1

While the internal chip is the STMicroelectronics L298N (a legacy dual H-bridge), the HW-133 refers to the module design—specifically the v1.0 PCB layout that integrates the chip with heat sinks, 5V regulation, and convenient screw terminals.

The datasheet for HW-133 is distinct from the official L298N chip datasheet. The chip datasheet talks about internal transistors and logic gates; the HW-133 datasheet tells you how to not burn your house down while plugging it into an Arduino. I2C bus:

The Hw-133-v1.0 includes a small blue potentiometer marked "103" (10kΩ). Turning it adjusts the trip point for the digital output.

Calibration Tip: Power the module and leave the probe dry. Turn the potentiometer slowly until the red DO LED just turns OFF. Then turn it back slightly (1/8 turn) clockwise. This sets the threshold just above the dry state, minimizing false triggers.