LC1BD04 DC5V 4 Digital Water Liquid Level Indicator Module with Soldering

The module is designed for a nominal 5V DC supply. While it may tolerate slight variations typical of regulated microcontroller power rails (e.g., 4.75V to 5.25V), operation outside this range is not recommended as it can affect the digital output signal integrity and comparator reference levels.

The module provides soldering pads for connection. You must solder wires from each of the four level detection input points to your conductive probes or sensor electrodes. A common ground/reference probe is also required. The module itself outputs a digital signal; the external probes form the sensing element.

It is suitable for non-corrosive, non-conductive liquids where the liquid itself acts as a resistive path to complete a circuit. For conductive liquids (like saltwater) or corrosive chemicals, the simple probe design may be unsuitable due to electrolysis, corrosion, or short-circuiting, potentially damaging the module or providing false readings.

The digital outputs are directly compatible with any 5V logic microcontroller, such as most Arduino boards (Uno, Mega), ESP32 (with 5V tolerance or level shifter), and 5V PLC digital inputs. For 3.3V systems (like Raspberry Pi, STM32), a simple voltage divider or logic level converter is recommended to protect the lower-voltage GPIO pins.